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Electric motor. An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. An electric generator is mechanically identical to an electric motor, but operates with a reversed flow of power, converting mechanical energy into electrical energy.Electric motors can be powered by direct current (DC) sources, such as from batteries, or rectifiers, or by alternating current (AC) sources, such as a power grid, inverters or electrical generators.Electric.

Electric motor. braking with traction motors, electric motors can be used in reverse as generators to recover energy that might otherwise be lost as heat and friction.Electric motors produce linear or rotary force (torque) intended to propel some external mechanism, such as a fan or an elevator. An electric motor is generally designed for continuous rotation, or for linear movement over a significant distance compared to its size. Magnetic solenoids are also transducers that convert electrical power to mechanical motion, but can produce motion over only a limited distance.## History.## Early motors.Before modern electromagnetic motors, experimental motors that worked by electrostatic force.

Electric motor. persistent electric currents. Hans Christian Ørsted discovered in 1820 that an electric current creates a magnetic field, which can exert a force on a magnet. It only took a few weeks for André-Marie Ampère to develop the first formulation of the electromagnetic interaction and present the Ampère's force law, that described the production of mechanical force by the interaction of an electric current and a magnetic field. The first demonstration of the effect with a rotary motion was given by Michael Faraday on 3 September 1821 in the basement of the Royal Institution. A free-hanging wire was dipped into a.

Electric motor. pool of mercury, on which a permanent magnet (PM) was placed. When a current was passed through the wire, the wire rotated around the magnet, showing that the current gave rise to a close circular magnetic field around the wire. Faraday published the results of his discovery in the "Quarterly Journal of Science", and sent copies of his paper along with pocket-sized models of his device to colleagues around the world so they could also witness the phenomenon of electromagnetic rotations. This motor is often demonstrated in physics experiments, substituting brine for (toxic) mercury. Barlow's wheel was an early refinement.

Electric motor. to this Faraday demonstration, although these and similar homopolar motors remained unsuited to practical application until late in the century.In 1827, Hungarian physicist Ányos Jedlik started experimenting with electromagnetic coils. After Jedlik solved the technical problems of continuous rotation with the invention of the commutator, he called his early devices "electromagnetic self-rotors". Although they were used only for teaching, in 1828 Jedlik demonstrated the first device to contain the three main components of practical DC motors: the stator, rotor and commutator. The device employed no permanent magnets, as the magnetic fields of both the stationary and revolving components were produced.

Electric motor. then higher performance.In 1855, Jedlik built a device using similar principles to those used in his electromagnetic self-rotors that was capable of useful work. He built a model electric vehicle that same year.A major turning point came in 1864, when Antonio Pacinotti first described the ring armature (although initially conceived in a DC generator, i.e. a dynamo). This featured symmetrically-grouped coils closed upon themselves and connected to the bars of a commutator, the brushes of which delivered practically non-fluctuating current. The first commercially successful DC motors followed the developments by Zénobe Gramme who, in 1871, reinvented Pacinotti's design and adopted.

Electric motor. from such tasks as handling grain or pumping water. Household uses (like in washing machines, dishwashers, fans, air conditioners and refrigerators (replacing ice boxes)) of electric motors reduced heavy labor in the home and made higher standards of convenience, comfort and safety possible. Today, electric motors consume more than half of the electric energy produced in the US.## AC motors.In 1824, French physicist François Arago formulated the existence of rotating magnetic fields, termed Arago's rotations, which, by manually turning switches on and off, Walter Baily demonstrated in 1879 as in effect the first primitive induction motor. In the 1880s many.

Electric motor. stator, which does not. It also includes two electrical parts, a set of magnets and an armature, one of which is attached to the rotor and the other to the stator, together forming a magnetic circuit: Field magnets - The magnets create a magnetic field that passes through the armature. These can be electromagnets or permanent magnets. The field magnet is usually on the stator and the armature on the rotor, but in some types of motor these are reversed.## Bearings.The rotor is supported by bearings, which allow the rotor to turn on its axis. The bearings are in turn.

Electric motor. supported by the motor housing.## Rotor.The rotor is the moving part that delivers the mechanical power. The rotor typically holds conductors that carry currents, which the magnetic field of the stator exerts force on to turn the shaft. Alternatively, some rotors carry permanent magnets, and the stator holds the conductors. Permanent magnets offer high efficiency over a larger operating speed and power range.An air gap between the stator and rotor allows it to turn. The width of the gap has a significant effect on the motor's electrical characteristics. It is generally made as small as possible, as a large gap.

Electric motor. weakens performance. It is the main source of the low power factor at which motors operate. The magnetizing current increases and the power factor decreases with the air gap, so narrow gaps are better. Conversely, gaps that are too small may pose mechanical problems in addition to noise and losses.The motor shaft extends through the bearings to the outside of the motor, where the load is applied. Because the forces of the load are exerted beyond the outermost bearing, the load is said to be overhung.## Stator.The stator surrounds the rotor, and usually holds field magnets, which are either electromagnets.

Electric motor. consisting of wire windings around a ferromagnetic iron core or permanent magnets. These create a magnetic field that passes through the rotor armature, exerting force on the windings. The stator core is made up of many thin metal sheets that are insulated from each other, called laminations. Laminations are used to reduce energy losses that would result if a solid core were used. Resin-packed motors, used in washing machines and air conditioners, use the damping properties of resin (plastic) to reduce noise and vibration. These motors encapsulate the stator in plastic.## Armature.The armature consists of wire windings on a ferromagnetic.

Electric motor. core. Electric current passing through the wire causes the magnetic field from the field magnet to exert a force (Lorentz force) on it, turning the rotor, which delivers the mechanical output. Windings are wires that are laid in coils, usually wrapped around a laminated, soft, iron, ferromagnetic core so as to form magnetic poles when energized with current.Electric machines come in salient- and nonsalient-pole configurations. In a salient-pole motor the ferromagnetic cores on the rotor and stator have projections called poles facing each other, with a wire winding around each pole below the pole face, which become north or south.

Electric motor. poles of the magnetic field when current flows through the wire. In a nonsalient-pole (or distributed field or round-rotor) motor, the ferromagnetic core is a smooth cylinder, with the windings distributed evenly in slots about the circumference. Supplying alternating current in the windings creates poles in the core that rotate continuously. A shaded-pole motor has a winding around part of the pole that delays the phase of the magnetic field for that pole.## Commutator.A commutator is a rotary electrical switch that supplies current to the rotor. It periodically reverses the flow of current in the rotor windings as the shaft.

Electric motor. each rotor winding would reverse with each half turn, so the rotor would stop. Commutators are inefficient and commutated motors have been mostly replaced by brushless direct current motors, permanent magnet motors, and induction motors.## Motor supply and control.## Motor supply.A DC motor is usually supplied through a split ring commutator as described above. AC motors' commutation can be achieved using either a slip ring commutator or external commutation. It can be fixed-speed or variable-speed control type, and can be synchronous or asynchronous. Universal motors can run on either AC or DC.## Motor control.DC motors can be operated at variable.

Electric motor. speeds by adjusting the voltage applied to the terminals or by using pulse-width modulation (PWM).AC motors operated at a fixed speed are generally powered directly from the grid or through motor soft starters.AC motors operated at variable speeds are powered with various power inverter, variable-frequency drive or electronic commutator technologies.The term electronic commutator is usually associated with self-commutated brushless DC motor and switched reluctance motor applications.## Types.Electric motors operate on one of three physical principles: magnetism, electrostatics and piezoelectricity.In magnetic motors, magnetic fields are formed in both the rotor and the stator. The product between these two fields gives rise.

Electric motor. to a force, and thus a torque on the motor shaft. One, or both, of these fields must change with the rotation of the rotor. This is done by switching the poles on and off at the right time, or varying the strength of the pole.The main types are DC motors and AC motors, with the latter replacing the former. AC electric motors are either asynchronous or synchronous.Once started, a synchronous motor requires synchrony with the moving magnetic field's speed for all normal torque conditions.In synchronous machines, the magnetic field must be provided by means other than induction, such as.

Electric motor. from separately excited windings or permanent magnets.A fractional-horsepower motor either has a rating below about 1 horsepower (0.746 kW), or is manufactured with a standard-frame size smaller than a standard 1 HP motor. Many household and industrial motors are in the fractional-horsepower class.Notes: Rotation is independent of the frequency of the AC voltage. Rotation is equal to synchronous speed (motor-stator-field speed). In SCIM, fixed-speed operation rotation is equal to synchronous speed, less slip speed. In non-slip energy-recovery systems, WRIM is usually used for motor-starting but can be used to vary load speed. Variable-speed operation. Whereas induction- and synchronous-motor drives are.

Electric motor. typically with either six-step or sinusoidal-waveform output, BLDC-motor drives are usually with trapezoidal-current waveform; the behavior of both sinusoidal and trapezoidal PM machines is, however, identical in terms of their fundamental aspects. In variable-speed operation, WRIM is used in slip-energy recovery and double-fed induction-machine applications. A cage winding is a shorted-circuited squirrel-cage rotor, a wound winding is connected externally through slip rings. Mostly single-phase with some three-phase.Abbreviations: BLAC – Brushless AC BLDC – Brushless DC BLDM – Brushless DC motor EC – Electronic commutator PM – Permanent magnet IPMSM – Interior permanent-magnet synchronous motor PMSM – Permanent magnet synchronous motor.

Electric motor. SPMSM – Surface permanent magnet synchronous motor SCIM – Squirrel-cage induction motor SRM – Switched reluctance motor SyRM – Synchronous reluctance motor VFD – Variable-frequency drive WRIM – Wound-rotor induction motor WRSM – Wound-rotor synchronous motor LRA – Locked-rotor amps: The current you can expect under starting conditions when you apply full voltage. It occurs instantly during start-up. RLA – Rated-load amps: The maximum current a motor should draw under any operating conditions. Often mistakenly called running-load amps, which leads people to believe, incorrectly, that the motor should always pull these amps. FLA – Full-load amps: Changed in 1976 to.

Electric motor. "RLA – rated-load amps".## Self-commutated motor.## Brushed DC motor.Most DC motors are small permanent magnet (PM) types. They contain a brushed internal mechanical commutation to reverse motor windings' current in synchronism with rotation.## Electrically excited DC motor.A commutated DC motor has a set of rotating windings wound on an armature mounted on a rotating shaft. The shaft also carries the commutator. Thus, every brushed DC motor has AC flowing through its windings. Current flows through one or more pairs of brushes that touch the commutator; the brushes connect an external source of electric power to the rotating armature.The rotating armature.

Electric motor. consists of one or more wire coils wound around a laminated, magnetically "soft" ferromagnetic core. Current from the brushes flows through the commutator and one winding of the armature, making it a temporary magnet (an electromagnet). The magnetic field produced interacts with a stationary magnetic field produced by either PMs or another winding (a field coil), as part of the motor frame. The force between the two magnetic fields rotates the shaft. The commutator switches power to the coils as the rotor turns, keeping the poles from ever fully aligning with the magnetic poles of the stator field, so that.

Electric motor. – A set of windings that produces a magnetic field. Commutation: A mechanical technique in which rectification can be achieved, or from which DC can be derived.The five types of brushed DC motor are: Shunt-wound Series-wound Compound (two configurations): Cumulative compound Differentially compounded Permanent magnet (not shown) Separately excited (not shown).## Permanent magnet.A permanent magnet (PM) motor does not have a field winding on the stator frame, relying instead on PMs to provide the magnetic field. Compensating windings in series with the armature may be used on large motors to improve commutation under load. This field is fixed and cannot.

Electric motor. be adjusted for speed control. PM fields (stators) are convenient in miniature motors to eliminate the power consumption of the field winding. Most larger DC motors are of the "dynamo" type, which have stator windings. Historically, PMs could not be made to retain high flux if they were disassembled; field windings were more practical to obtain the needed flux. However, large PMs are costly, as well as dangerous and difficult to assemble; this favors wound fields for large machines.To minimize overall weight and size, miniature PM motors may use high energy magnets made with neodymium; most are neodymium-iron-boron alloy. With.

Electric motor. their higher flux density, electric machines with high-energy PMs are at least competitive with all optimally designed singly-fed synchronous and induction electric machines. Miniature motors resemble the structure in the illustration, except that they have at least three rotor poles (to ensure starting, regardless of rotor position) and their outer housing is a steel tube that magnetically links the exteriors of the curved field magnets.## Electronic commutator (EC).## Brushless DC.Some of the problems of the brushed DC motor are eliminated in the BLDC design. In this motor, the mechanical "rotating switch" or commutator is replaced by an external electronic switch.

Electric motor. synchronised to the rotor's position. BLDC motors are typically 85%+ efficient, reaching up to 96.5%, while brushed DC motors are typically 75–80% efficient.The BLDC motor's characteristic trapezoidal counter-electromotive force (CEMF) waveform is derived partly from the stator windings being evenly distributed, and partly from the placement of the rotor's permanent magnets. Also known as electronically commutated DC or inside-out DC motors, the stator windings of trapezoidal BLDC motors can be single-phase, two-phase or three-phase and use Hall effect sensors mounted on their windings for rotor position sensing and low cost closed-loop commutator control.BLDC motors are commonly used where precise speed.

Electric motor. motors are usually used in small equipment such as computers and are generally used in fans to remove heat. They make little noise, which is an advantage in equipment that is affected by vibrations.Modern BLDC motors range in power from a fraction of a watt to many kilowatts. Larger BLDC motors rated up to about 100 kW are used in electric vehicles. They also find use in electric model aircraft.## Switched reluctance motor.The switched reluctance motor (SRM) has no brushes or permanent magnets, and the rotor has no electric currents. Torque comes from a slight misalignment of poles on the.

Electric motor. rotor with poles on the stator. The rotor aligns itself with the magnetic field of the stator, while the stator field windings are sequentially energized to rotate the stator field.The magnetic flux created by the field windings follows the path of least magnetic sending the flux through rotor poles that are closest to the energized poles of the stator, thereby magnetizing those poles of the rotor and creating torque. As the rotor turns, different windings are energized, keeping the rotor turning.SRMs are used in some appliances and vehicles.## Universal AC/DC motor.A commutated, electrically excited, series or parallel wound motor is.

Electric motor. referred to as a universal motor because it can be designed to operate on either AC or DC power. A universal motor can operate well on AC because the current in both the field and the armature coils (and hence the resultant magnetic fields) synchronously reverse polarity, and hence the resulting mechanical force occurs in a constant direction of rotation.Operating at normal power line frequencies, universal motors are often used in sub-kilowatt applications. Universal motors formed the basis of the traditional railway traction motor in electric railways. In this application, using AC power on a motor designed to run on.

Electric motor. DC would experience efficiency losses due to eddy current heating of their magnetic components, particularly the motor field pole-pieces that, for DC, would have used solid (un-laminated) iron. They are now rarely used.An advantage is that AC power may be used on motors that specifically have high starting torque and compact design if high running speeds are used. By contrast, maintenance is higher and lifetimes are shortened. Such motors are used in devices that are not heavily used, and have high starting-torque demands. Multiple taps on the field coil provide (imprecise) stepped speed control. Household blenders that advertise many speeds.

Electric motor. an asynchronous AC motor where power is transferred to the rotor by electromagnetic induction, much like transformer action. An induction motor resembles a rotating transformer, because the stator (stationary part) is essentially the primary side of the transformer and the rotor (rotating part) is the secondary side. Polyphase induction motors are widely used in industry.## Cage and wound rotor.Induction motors may be divided into Squirrel Cage Induction Motors (SCIM) and Wound Rotor Induction Motors (WRIM). SCIMs have a heavy winding made up of solid bars, usually aluminum or copper, electrically connected by rings at the ends of the rotor. The.

Electric motor. bars and rings as a whole are much like an animal's rotating exercise cage.Currents induced into this winding provide the rotor magnetic field. The shape of the rotor bars determines the speed-torque characteristics. At low speeds, the current induced in the squirrel cage is nearly at line frequency and tends to stay in the outer parts of the cage. As the motor accelerates, the slip frequency becomes lower, and more current reaches the interior. By shaping the bars to change the resistance of the winding portions in the interior and outer parts of the cage, a variable resistance is effectively.

Electric motor. steering wheels.Another common application is to control the throttle of an internal combustion engine with an electronic governor. The motor works against a return spring to move the throttle in accord with the governor output. The latter monitors engine speed by counting electrical pulses from the ignition system or from a magnetic pickup and depending on the speed, makes small adjustments to the amount of current. If the engine slows down relative to the desired speed, the current increases, producing more torque, pulling against the return spring and opening the throttle. Should the engine run too fast, the governor reduces.

Electric motor. the current, allowing the return spring to pull back and reduce the throttle.## Synchronous motor.A synchronous electric motor is an AC motor. It includes a rotor spinning with coils passing magnets at the same frequency as the AC and produces a magnetic field to drive it. It has zero slip under typical operating conditions. By contrast induction motors must slip to produce torque. One type of synchronous motor is like an induction motor except that the rotor is excited by a DC field. Slip rings and brushes conduct current to the rotor. The rotor poles connect to each other and.

Electric motor. when slip rate decreases sufficiently, the rotor (a smooth cylinder) becomes temporarily magnetized. Its distributed poles make it act like a permanent magnet synchronous motor. The rotor material, like that of a common nail, stays magnetized, but can be demagnetized with little difficulty. Once running, the rotor poles stay in place; they do not drift.Low-power synchronous timing motors (such as those for traditional electric clocks) may have multi-pole permanent magnet external cup rotors, and use shading coils to provide starting torque. "Telechron" clock motors have shaded poles for starting torque, and a two-spoke ring rotor that performs like a discrete.

Electric motor. allows for a smaller electronic converter but the cost of the rotor winding and slip rings may offset the saving in the power electronics components. Difficulties affect controlling speed near synchronous speed limit applications.## Special magnetic motors.## Rotary.## Ironless or coreless rotor motor.The coreless or ironless DC motor is a specialized permanent magnet DC motor. Optimized for rapid acceleration, the rotor is constructed without an iron core. The rotor can take the form of a winding-filled cylinder, or a self-supporting structure comprising only wire and bonding material. The rotor can fit inside the stator magnets; a magnetically soft stationary cylinder.

Electric motor. inside the rotor provides a return path for the stator magnetic flux. A second arrangement has the rotor winding basket surrounding the stator magnets. In that design, the rotor fits inside a magnetically soft cylinder that can serve as the motor housing, and provides a return path for the flux.Because the rotor is much lower mass than a conventional rotor, it can accelerate much more rapidly, often achieving a mechanical time constant under one millisecond. This is especially true if the windings use aluminum rather than (heavier) copper. The rotor has no metal mass to act as a heat sink;.

Electric motor. even small motors must be cooled. Overheating can be an issue for these designs.The vibrating alert of cellular phones can be generated by cylindrical permanent-magnet motors, or disc-shaped types that have a thin multipolar disc field magnet, and an intentionally unbalanced molded-plastic rotor structure with two bonded coreless coils. Metal brushes and a flat commutator switch power to the rotor coils.Related limited-travel actuators have no core and a bonded coil placed between the poles of high-flux thin permanent magnets. These are the fast head positioners for rigid-disk ("hard disk") drives. Although the contemporary design differs considerably from that of loudspeakers,.

Electric motor. it is still loosely (and incorrectly) referred to as a "voice coil" structure, because some earlier rigid-disk-drive heads moved in straight lines, and had a drive structure much like that of a loudspeaker.## Pancake or axial rotor motor.The printed armature or pancake motor has windings shaped as a disc running between arrays of high-flux magnets. The magnets are arranged in a circle facing the rotor spaced to form an axial air gap. This design is commonly known as the pancake motor because of its flat profile.The armature (originally formed on a printed circuit board) is made from punched copper sheets.

Electric motor. with 180 (C), Class H rating.The unique advantage of ironless DC motors is the absence of cogging (torque variations caused by changing attraction between the iron and the magnets). Parasitic eddy currents cannot form in the rotor as it is totally ironless, although iron rotors are laminated. This can greatly improve efficiency, but variable-speed controllers must use a higher switching rate (>40 kHz) or DC because of decreased electromagnetic induction.These motors were invented to drive the capstan(s) of magnetic tape drives, where minimal time to reach operating speed and minimal stopping distance were critical. Pancake motors are widely used in.

Electric motor. high-performance servo-controlled systems, robotic systems, industrial automation and medical devices. Due to the variety of constructions now available, the technology is used in applications from high temperature military to low cost pump and basic servos.Another approach (Magnax) is to use a single stator sandwiched between two rotors. One such design has produced peak power of 15 kW/kg, sustained power around 7.5 kW/kg. This yokeless axial flux motor offers a shorter flux path, keeping the magnets further from the axis. The design allows zero winding overhang; 100 percent of the windings are active. This is enhanced with the use of rectangular-crosssection.

Electric motor. copper wire. The motors can be stacked to work in parallel. Instabilities are minimized by ensuring that the two rotor discs put equal and opposing forces onto the stator disc. The rotors are connected directly to one another via a shaft ring, cancelling out the magnetic forces.Magnax motors range in size from 0.15-5.4 (m) in diameter.## Servo motor.A servo motor is a motor that is used within a position-control or speed-control feedback system. Servomotors are used in applications such as machine tools, pen plotters, and other process systems. Motors intended for use in a servomechanism must have predictable characteristics for.

Electric motor. speed, torque, and power. The speed/torque curve is important and is high ratio for a servo motor. Dynamic response characteristics such as winding inductance and rotor inertia are important; these factors limit performance. Large, powerful, but slow-responding servo loops may use conventional AC or DC motors and drive systems with position or speed feedback. As dynamic response requirements increase, more specialized motor designs such as coreless motors are used. AC motors' superior power density and acceleration characteristics tends to favor permanent magnet synchronous, BLDC, induction, and SRM drive approaches.A servo system differs from some stepper motor applications in that position.

Electric motor. feedback is continuous while the motor is running. A stepper system inherently operates open-loop—relying on the motor not to "miss steps" for short term accuracy—with any feedback such as a "home" switch or position encoder external to the motor system.## Stepper motor.Stepper motors are typically used to provide precise rotations. An internal rotor containing permanent magnets or a magnetically soft rotor with salient poles is controlled by a set of electronically switched external magnets. A stepper motor may also be thought of as a cross between a DC electric motor and a rotary solenoid. As each coil is energized in.

Electric motor. turn, the rotor aligns itself with the magnetic field produced by the energized field winding. Unlike a synchronous motor, the stepper motor may not rotate continuously; instead, it moves in steps—starting and then stopping—advancing from one position to the next as field windings are energized and de-energized in sequence. Depending on the sequence, the rotor may turn forwards or backwards, and it may change direction, stop, speed up or slow down at any time.Simple stepper motor drivers entirely energize or entirely de-energize the field windings, leading the rotor to "cog" to a limited number of positions. Microstepping drivers can proportionally.

Electric motor. made them uncompetitive—thus newer hard disk drives use voice coil-based head actuator systems. (The term "voice coil" in this connection is historic; it refers to the structure in a cone-type loudspeaker.)Stepper motors are often used in computer printers, optical scanners, and digital photocopiers to move the active element, the print head carriage (inkjet printers), and the platen or feed rollers.So-called quartz analog wristwatches contain the smallest commonplace stepping motors; they have one coil, draw little power, and have a permanent magnet rotor. The same kind of motor drives battery-powered quartz clocks. Some of these watches, such as chronographs, contain more.

Electric motor. 1978 era HP 7225A pen plotter used two linear stepper motors to move the pen along the X and Y axes.## Electromagnetism.## Force and torque.An electric motor converts electrical energy to mechanical energy through the force between two opposed magnetic fields. At least one of the two magnetic fields must be created by an electromagnet through the magnetic field caused by an electrical current.The force between a current formula_1 in a conductor of length formula_2 perpendicular to a magnetic field formula_3 may be calculated using the Lorentz force law: formula_4Note: X denotes vector cross product. The most general approaches to.

Electric motor. resistance Ir2 – square of current induced in the rotor s – motor slip; i.e., difference between synchronous speed and slip speed, which provides the relative movement needed for current induction in the rotor.## Back EMF.The movement of armature windings of a direct-current or universal motor through a magnetic field, induce a voltage in them. This voltage tends to oppose the motor supply voltage and so is called "back electromotive force (EMF)". The voltage is proportional to the running speed of the motor. The back EMF of the motor, plus the voltage drop across the winding internal resistance and brushes,.

Electric motor. enacted legislation to encourage the manufacture and use of higher-efficiency motors. Electric motors have efficiencies ranging from at least 15% for shaded pole motors, up to 98% for permanent magnet motors, with efficiency also dependent on load. Peak efficiency is usually at 75% of the rated load. So (as an example) a 10 HP motor is most efficient when driving a load that requires 7.5 HP. Efficiency also depends on motor size; larger motors tend to be more efficient. Some motors can not operate continually for more than a specified period of time (e.g. for more than an hour per.

Electric motor. run)## Goodness factor.Eric Laithwaite proposed a metric to determine the 'goodness' of an electric motor: formula_21Where: formula_22 is the goodness factor (factors above 1 are likely to be efficient) formula_23 are the cross sectional areas of the magnetic and electric circuit formula_24 are the lengths of the magnetic and electric circuits formula_25 is the permeability of the core formula_20 is the angular frequency the motor is driven atFrom this, he showed that the most efficient motors are likely to have relatively large magnetic poles. However, the equation only directly relates to non PM motors.## Performance parameters.## Torque.Electromagnetic motors derive torque.

Electric motor. from the vector product of the interacting fields. Calculating torque requires knowledge of the fields in the air gap. Once these have been established, the torque is the integral of all the force vectors multiplied by the vector's radius. The current flowing in the winding produces the fields. For a motor using a magnetic material the field is not proportional to the current.A figure relating the current to the torque can inform motor selection. The maximum torque for a motor depends on the maximum current, absent thermal considerations.When optimally designed within a given core saturation constraint and for a given.

Electric motor. active current (i.e., torque current), voltage, pole-pair number, excitation frequency (i.e., synchronous speed), and air-gap flux density, all categories of electric motors/generators exhibit virtually the same maximum continuous shaft torque (i.e., operating torque) within a given air-gap area with winding slots and back-iron depth, which determines the physical size of electromagnetic core. Some applications require bursts of torque beyond the maximum, such as bursts to accelerate an electric vehicle from standstill. Always limited by magnetic core saturation or safe operating temperature rise and voltage, the capacity for torque bursts beyond the maximum differs significantly across motor/generator types.Electric machines without a.

Electric motor. transformer circuit topology, such as that of WRSMs or PMSMs, cannot provide torque bursts without saturating the magnetic core. At that point, additional current cannot increase torque. Furthermore, the permanent magnet assembly of PMSMs can be irreparably damaged.Electric machines with a transformer circuit topology, such as induction machines, induction doubly-fed electric machines, and induction or synchronous wound-rotor doubly-fed (WRDF) machines, permit torque bursts because the EMF-induced active current on either side of the transformer oppose each other and thus contribute nothing to the transformer coupled magnetic core flux density, avoiding core saturation.Electric machines that rely on induction or asynchronous principles.

Electric motor. the air-gap area and the back-iron depth, which are determined by the power rating of the armature winding set, the speed of the machine, and the achievable air-gap flux density before core saturation. Despite the high coercivity of neodymium or samarium-cobalt permanent magnets, continuous torque density is virtually the same amongst electric machines with optimally designed armature winding sets. Continuous torque density relates to method of cooling and permissible operation period before destruction by overheating of windings or permanent magnet damage.Other sources state that various e-machine topologies have differing torque density. One source shows the following:where—specific torque density is normalized.

Electric motor. to 1.0 for the surface permanent magnet (SPM)—brushless ac, 180° current conduction.Torque density is approximately four times greater for liquid cooled motors, compared to those which are air cooled.A source comparing direct current, induction motors (IM), PMSM and SRM showed:Another source notes that PMSM up to 1 MW have considerably higher torque density than induction machines.## Continuous power density.The continuous power density is determined by the product of the continuous torque density and the constant torque speed range. Electric motors can achieve densities of up to 20KW/KG, meaning 20 Kilowatts of output power per kilogram.## Acoustic noise and vibrations.Acoustic noise.

Electric motor. and vibrations are usually classified in three sources: mechanical sources (e.g. due to bearings) aerodynamic sources (e.g. due to shaft-mounted fans) magnetic sources (e.g. due to magnetic forces such as Maxwell and magnetostriction forces acting on stator and rotor structures)The latter source, which can be responsible for the "whining noise" of electric motors, is called electromagnetically induced acoustic noise.## Standards.The following are major design, manufacturing, and testing standards covering electric motors: American Petroleum Institute: API 541 Form-Wound Squirrel Cage Induction Motors – 375 kW (500 Horsepower) and Larger American Petroleum Institute: API 546 Brushless Synchronous Machines – 500 kVA and.

Electric motor. 60072 Dimensions and output series for rotating electrical machines National Electrical Manufacturers Association: MG-1 Motors and Generators Underwriters Laboratories: UL 1004 – Standard for Electric Motors Indian Standard: IS:12615-2018 – Line Operated Three Phase a.c. Motors (IE CODE) “Efficiency Classes and Performance Specification” (Third Revision)## Non-magnetic motors.An electrostatic motor is based on the attraction and repulsion of electric charge. Usually, electrostatic motors are the dual of conventional coil-based motors. They typically require a high-voltage power supply, although small motors employ lower voltages. Conventional electric motors instead employ magnetic attraction and repulsion, and require high current at low voltages. In the.

Electric motor. produces acoustic or ultrasonic vibrations to produce linear or rotary motion. In one mechanism, the elongation in a single plane is used to make a series of stretches and position holds, similar to the way a caterpillar moves.An electrically powered spacecraft propulsion system uses electric motor technology to propel spacecraft in outer space. Most systems are based on electrically accelerating propellant to high speed, while some systems are based on electrodynamic tethers principles of propulsion to the magnetosphere. Electric generator Regenerative brake Goodness factor Motor capacitor Traction motor Motor controller Houston, Edwin J.; Kennelly, Arthur, "Recent Types of Dynamo-Electric Machinery",.


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Octagon. angles total 360°.If squares are constructed all internally or all externally on the sides of an octagon, then the midpoints of the segments connecting the centers of opposite squares form a quadrilateral that is both equidiagonal and orthodiagonal (that is, whose diagonals are equal in length and at right angles to each other).The midpoint octagon of a reference octagon has its eight vertices at the midpoints of the sides of the reference octagon. If squares are constructed all internally or all externally on the sides of the midpoint octagon, then the midpoints of the segments connecting the centers of opposite.

Octagon. squares themselves form the vertices of a square.## Regular octagon.A regular octagon is a closed figure with sides of the same length and internal angles of the same size. It has eight lines of reflective symmetry and rotational symmetry of order 8. A regular octagon is represented by the Schläfli symbol {8}.The internal angle at each vertex of a regular octagon is 135° (formula_1 radians). The central angle is 45° (formula_2 radians).## Area.The area of a regular octagon of side length "a" is given byformula_3In terms of the circumradius "R", the area isformula_4In terms of the apothem "r" (see also.


Question: Who is the discoverer or inventor of this item?

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Thermometer. in medicine, and in scientific research.## History.While an individual thermometer is able to measure degrees of hotness, the readings on two thermometers cannot be compared unless they conform to an agreed scale. Today there is an absolute thermodynamic temperature scale. Internationally agreed temperature scales are designed to approximate this closely, based on fixed points and interpolating thermometers. The most recent official temperature scale is the International Temperature Scale of 1990. It extends from 0.65 (K) to approximately 1358 (K).## Early developments.Various authors have credited the invention of the thermometer to Hero of Alexandria. The thermometer was not a single invention,.

Thermometer. however, but a development.Hero of Alexandria (10–70 AD) knew of the principle that certain substances, notably air, expand and contract and described a demonstration in which a closed tube partially filled with air had its end in a container of water. The expansion and contraction of the air caused the position of the water/air interface to move along the tube.Such a mechanism was later used to show the hotness and coldness of the air with a tube in which the water level is controlled by the expansion and contraction of the gas. These devices were developed by several European scientists.

Thermometer. graduations based on the melting and boiling points of water as standards and, in 1694, Carlo Renaldini (1615–1698) proposed using them as fixed points along a universal scale. In 1701, Isaac Newton (1642–1726/27) proposed a scale of 12 degrees between the melting point of ice and body temperature.## Era of precision thermometry.In 1714, scientist and inventor Daniel Gabriel Fahrenheit invented a reliable thermometer, using mercury instead of alcohol and water mixtures. In 1724, he proposed a temperature scale which now (slightly adjusted) bears his name. In 1742, Anders Celsius (1701–1744) proposed a scale with zero at the boiling point and.


Question: Which city or region does this river locate in?

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North River (Hudson River). North River is an alternative name for the southernmost portion of the Hudson River in the vicinity of New York City and northeastern New Jersey in the United States. The entire watercourse was known as the North River by the Dutch in the early seventeenth century; the term fell out of general use for most of the river's 300+ mile course during the early 1900s. However the name remains in very limited use as an artifact among history-inclined local mariners and others and on some nautical charts and maps. The term is also used for infrastructure on and under the.

North River (Hudson River). river, such as the North River piers, North River Tunnels, and the North River Wastewater Treatment Plant.At different times "North River" has referred to: the entire Hudson the approximate 160-mile portion of the Hudson below its confluence with the Mohawk River, which is under tidal influence the portion of it running between Manhattan and New Jersey the length flowing between Lower Manhattan and Hudson County, New Jersey.Its history is strongly connected to shipping industry in the Port of New York and New Jersey, which shifted primarily to Port Newark in the mid-20th century due to the construction of the Holland.

North River (Hudson River). and "East" River were so named for the direction of travel they permitted once having entered the Upper New York Bay.In 1808 the Secretary of the Treasury, Albert Gallatin, issued his report of proposed locations for transportation and communication internal improvements of national importance. The North River figures prominently among his proposals as the best route toward western and northern lands; similar routes were chosen for the Erie Canal and other early canals built by the state of New York. He notes the following in reference to the North and Hudson Rivers:## "North River" on maps.The National Oceanic and Atmospheric.

North River (Hudson River). Administration's current charts call the lower river the "Hudson", and the United States Geological Survey lists "North River" as an alternative name of the Hudson River without qualifying it as any particular portion of the river.Hagstrom Maps, formerly the leading mapmaker in the New York metropolitan area and known for occasional quirky and anachronistic names, features, and artifacts on their maps, has labeled all or part of the Hudson adjacent to Manhattan as "North River" on several of its products. For instance, on a 1997 Hagstrom "Map of Manhattan", the stretch of river between Hudson County, New Jersey, and Lower.

North River (Hudson River). Manhattan (roughly corresponding to the location of the North River piers) was labeled "North River", with the label "Hudson River" used above Midtown Manhattan.On a 2000 map of "Northern Approaches to New York City" included in Hagstrom's "New York [State] Road Map" the entire river adjacent to Manhattan was labeled "Hudson River (North River)", with just "Hudson River" (no parenthetical) appearing further north at Tappan Zee.## North River piers.Piers along the Hudson shore of Manhattan were formerly used for shipping and berthing ocean-going ships. In shipping notices, they were designated as, for example, "Pier 14, North River". As with the.

North River (Hudson River). North Moore Street to Pier 99 at 59th Street. Many of these piers and the waterfront between them are part of the Hudson River Park which stretches from 59th Street to the Battery. The park, a joint project between New York City and New York State commenced in 1998, consists of several non-contiguous parcels of land and piers totaling 125 (acre), plus another 400 (acre) of the river itself. Several piers were rebuilt for adaptive re-use as part of the park project, with approximately 70% of the planned work complete by 2011. Pier A is a designated national and New.

North River (Hudson River). park designed by OLIN and Rafael Viñoly is set to open in late 2020.Pier 34, at Canal Street, contains a ventilation shaft for the Holland Tunnel.Pier 40, at Houston Street, was built as a terminal for the Holland America Line in 1962, and now contains various playing fields, long-term parking spaces and the Trapeze School of New York on the roof (during the summer).The term "Christopher Street Pier" usually refers specifically to Pier 45 opposite West 10th Street in Greenwich Village. However, it refers to three other piers as well, between Piers 42–51. Pier 51 houses a water-themed playground, part.

North River (Hudson River). of Hudson River Park.Piers 52 and 53, also known as Gansevoort Peninsula, were formerly a New York City Department of Sanitation facility and are being converted into a public park that is supposed to be complete in 2022. At the end of Pier 53 is the FDNY's Marine 1 fireboat facility. The facility occupies a new building completed in 2011.Pier 54, part of Hudson River Park since its creation in 1998, was closed in 2011 when it was deemed structurally unsound. Plans were unveiled in November 2014 for a new park designed by Heatherwick Studio and costing $130 million. The.

North River (Hudson River). project was temporarily canceled in 2017 after costs had grown to $250 million, but was later revived as part of an agreement to complete the remainder of Hudson River Park. The new park, dubbed "Little Island," will take the place of the now-dismantled Piers 54 and 55, and is expected to open in 2021.Pier 57, at 15th Street and 11th Avenue, formerly served as a terminal for shipping and storage of cargo for the Grace Line. Between 1969 and 2003, Pier 57 housed the Hudson Pier Bus Depot for the New York City Transit Authority. Since then, it has been.

North River (Hudson River). Ohio Railroad transfer barge. In the late 1980s, boat enthusiast John Krevey converted an old railroad barge on the Hudson River to a floating jetty.Pier 66 is part of Hudson River Park, It is located at 26th Street and is used for sailing and paddle sports.Pier 76. On June 9, 2021 the Hudson River Park Trust reopened Pier 76, formerly the NYPD impound lot, as a park and cultural space. The $31 million project also includes environmental abatement, repaving, interpretive panels relay the history of the area, including the indigenous Lenape people of Mannahatta and the evolution of the city’s.

North River (Hudson River). shipping industry. The pier also features a 30-ton propeller from the passenger liner SS United States, which in 1952 set the Atlantic crossing speed record for passenger liners. In the future it will be part of the expanded High Line.Pier 79 is the West Midtown Ferry Terminal used by NY Waterway, while Pier 83 is used by Circle Line Sightseeing Cruises. Pier 79 connects to an Art Deco style ventilation shaft for the Lincoln Tunnel.Pier 84 served as a concert venue from the former Schaefer Music Festival. The pier also houses a water-themed playground within Hudson River Park, is a.

North River (Hudson River). stop for New York Water Taxi, and has a bicycle rental shop and other businesses serving primarily tourists.Pier 86 at West 46th Street is home to the Intrepid Sea, Air & Space Museum, the centerpiece of which is the USS "Intrepid", an aircraft carrier that served from World War II to the Vietnam War. This pier once served as the passenger ship terminal for the United States Lines.Piers 88–92 are part of the New York Passenger Ship Terminal, used by numerous modern cruise ships and ocean liners. In 1942, the USS "Lafayette" (formerly SS "Normandie") caught fire at Pier 88,.

North River (Hudson River). remaining capsized there for a year. Pier 94 was formerly also part of the Passenger Ship Terminal, until 2020 housed the "Unconvention Center", the second-largest exhibition hall in New York City.Pier 96 is part of Hudson River Park.Pier 97 is part of Hudson River Park. It was until 1975 the home of the Swedish American Line passenger ship terminal. The terminal was demolished some time after 1984 and the pier has since been used for various purposes, including many years as a Sanitation Department parking lot and a brief period as a live event venue sponsored by JBL and Live.

North River (Hudson River). Nation. In November 2019, it was announced that the pier would be converted into a park, with construction expected to start in September 2020. As of September 2020, the pier is now expected to reopen in March 2024. Pier 98 is used for Con Edison employee car parking, a training facility and delivery by barge and storage of fuel oil. Pier 99 houses the West 59th Street Marine Transfer Station, used by the New York City Sanitation Department. Pier I and most of Riverside Park South were originally part of the abandoned Penn Central railyard between 59th and 72nd Streets.

North River (Hudson River). These lettered piers were built at a 55-degree angle to the shore to facilitate the transfer of rail cars from their tracks to a waiting barge. Pier I is the only remaining rail pier. The 69th Street Transfer Bridge of the New York Central Railroad is still extant and has been listed on the National Register of Historic Places since 2003.## Railroads and ferries.Prior to the opening of the North River Tunnels and the Hudson and Manhattan Railroad tubes in the early 1900s, passengers and freight were required to cross the river for travel to points east. This led to.

North River (Hudson River). at Wall Street, and the West Midtown Ferry Terminal. Pavonia Terminal operated from 1861 to 1958. The terminal, completed in 1889 by the Erie Railroad, was at the end of the Long Dock which extended into the partially landfilled Harsimus Cove. The Jersey City Terminal was also used by the New York, Susquehanna and Western Railway, but was called by the name given to the seventeenth century New Netherland settlement of Pavonia. Ferry service began in the 1840s. The main Pavonia Ferry later ran to Chambers Street and 23rd Street. Pavonia's Erie trains were moved to Hoboken Terminal between 1956.

North River (Hudson River). Conrail, operated until the state takeover in the 1970s. The main routes of the Hoboken Ferry ran to Barclay Street, Christopher Street and 23rd Street; these ferries operated until 1967. Today New York Waterway ferries travel to the Battery Park City Ferry Terminal, Pier 11 at Wall Street and the West Midtown Ferry Terminal. Weehawken Terminal operated from 1884 to 1959 as the terminus for New York Central Railroad's West Shore Railroad division as well as for the New York, Ontario and Western Railway. The extensive Weehawken Yards also handle freight for the Erie Railroad with the New Jersey Junction.

North River (Hudson River). Railroad. The New York Central Railroad 69th Street Transfer Bridge is now a historic site. The main Weehawken Ferry travelled directly across the river to 42nd Street and for a time was part of route of the Lincoln Highway. Other ferries included those to 14th Street and Cortland Street. The original tunnel under Bergen Hill is now used by the Hudson Bergen Light Rail. Ferry service is now provided from Weehawken Port Imperial to West Midtown Ferry Terminal, BPC Ferry Terminal, and Wall Street. The New York, Susquehanna and Western Railway terminus in Shadyside, Edgewater was opened in 1894 for.

North River (Hudson River). Bridge. Since 2003, various proposals have been made to add a new train line. This includes an extension of the completed 7 Subway Extension, the canceled Access to the Region's Core, and the proposed Gateway Project. List of ferries across the Hudson River to New York City Timeline of Jersey City area railroads New York Harbor Geography of New York Harbor List of New Jersey rivers List of New York rivers List of bridges, tunnels, and cuts in Hudson County, New Jersey A Guide to a Hudson River Park Walk from Battery Park to Riverside Park Wired New York -.

North River (Hudson River). Hudson River Piers North River Historic Ship Society: Historic Vessels of New York Harbor.


Question: Which place is this animal endemic to?

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Yellow-bellied slider. The yellow-bellied slider ("Trachemys scripta scripta") is a land and water turtle belonging to the family Emydidae. This subspecies of pond slider is native to the southeastern United States, specifically from Florida to southeastern Virginia, and is the most common turtle species in its range. It is found in a wide variety of habitats, including slow-moving rivers, floodplain swamps, marshes, seasonal wetlands, and permanent ponds. Yellow-bellied sliders are popular as pets.## Description.Adult male yellow-bellied sliders typically reach 5 - 9 (in) in length; females range from 8 - 13 (in). The carapace (upper shell) is typically brown and black, often.

Yellow-bellied slider. may be kept in a fairly small tank (20 to 40 gallons), but as they age, after about three years, they will require much more space. One adult may be housed in a 75 (USgal) or larger aquarium. The turtles require enough water to turn around, with a depth of 16 - 18 (in) recommended. Water temperature should be kept between 72 and 80 °F (22–27 °C) and properly filtered. Keeping fish with turtles is usually avoided due to the risk that the turtle will eat the fish. Sliders need a basking area that is kept warm during the day.


Question: Who is the discoverer or inventor of this drink?

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Bénédictine. Bénédictine () is a herbal liqueur produced in France. It was developed by wine merchant Alexandre Le Grand in the 19th century, and is reputedly flavored with twenty-seven flowers, berries, herbs, roots, and spices. A drier version, B&B, blending Bénédictine with brandy, was developed in the 1930s.## History.In 1863 Alexandre Le Grand developed a recipe for an herbal liqueur, helped by a local chemist, from old medicinal recipes that he had acquired from a religious foundation where a maternal grandparent had held office as a fiscal prosecutor. To market it, he embellished a story of it having been developed by.


Question: What is the closest upper taxonomy of this plant?

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Erodium. Erodium is a genus of flowering plants in the botanical family Geraniaceae. The genus includes about 60 species, native to North Africa, Indomalaya, the Middle East, and Australia. They are perennials, annuals, or subshrubs, with five-petalled flowers in shades of white, pink, and purple, that strongly resemble the better-known "Geranium" (cranesbill). Cultivated plants are known as filarees or heron's bill in North America, whereas in the British Isles they are usually called storksbills.## Taxonomy.Carl Linnaeus grouped in the same genus ("Geranium"), the three similar genera "Erodium", "Geranium", and "Pelargonium". The distinction between them was made by Charles Louis L'Héritier de.


Question: Who designed this bridge?

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Franz Joseph Bridge. Franz Joseph Bridge (), later renamed Štefanik Bridge (), was a suspension bridge over the Vltava in Prague, opened in 1868.The bridge was designed by the English engineer Rowland Mason Ordish. The design, which used the Ordish–Lefeuvre system, was originally created for the Albert Bridge over the River Thames in London. However, after construction of the Albert Bridge was delayed, Ordish decided to build a bridge in Prague first. The foundation stone was laid on 19 October 1865, and engineer František Schön was charged with supervising the construction work. Emperor Franz Joseph, after whom the bridge was named, attended the.


Question: What is the spore print color of this plant?

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Cerioporus squamosus. Cerioporus squamosus aka "Polyporus squamosus" is a basidiomycete bracket fungus, with common names including dryad's saddle and pheasant's back mushroom. It has a widespread distribution, being found in North America, Australia, Asia, and Europe, where it causes a white rot in the heartwood of living and dead hardwood trees. The name "dryad's saddle" refers to creatures in Greek mythology called dryads who could conceivably fit and ride on this mushroom, whereas the "pheasant's back" analogy derives from the pattern of colors on the bracket matching that of a pheasant's back.## Etymology."Squamosus" comes from the Latin "squamosus" meaning covered with scales.

Cerioporus squamosus. or scaly, referring to the signature dark brown scales found on the mushroom's cap.## Taxonomy.The species was first described scientifically by British botanist William Hudson in 1778, who named it "Boletus squamosus". It was given its current name in 1886 by Quélet but is still widely known by the Friesian name "Polyporus squamosus".## Description.Dryad's Saddle is an annual mushroom commonly found attached to dead logs and stumps or on living hardwood trees at one point with a thick stem. Generally, the fruit body is round and between 8 – 30 (cm) across and up to 10 (cm) thick. The body.

Cerioporus squamosus. can be yellow to brown and has "squamules" or scales on its upper side. On the underside one can see the pores that are characteristic of the genus "Cerioporus"; they are made up of tubes packed together closely. The tubes are between 1 and 12 (mm) long. The stalk is thick and short, up to 5 (cm) long. The fruit body will produce a white spore print if laid onto a sheet of paper. The spores are 11-15 x 4-5 µm and are long and smooth ellipsoids. They can be found alone, in clusters of two or three, or forming.

Cerioporus squamosus. made from this and many other mushrooms of the genus "Cerioporus". The mushroom's smell resembles watermelon rind. "Polyporus squamosus" has a mild nutty flavour. Mushroom-Collecting.com: Polyporus squamosus – Dryad's Saddle Mushroom-Collecting.com: Dryad's Saddle, Pheasant Back Mushroom, Hawks Wing (Polyporus squamosus).


Question: What country does this island belong to?

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Confederation Bridge. The Confederation Bridge () is a box girder bridge carrying the Trans-Canada Highway across the Abegweit Passage of the Northumberland Strait, linking the province of Prince Edward Island with the province of New Brunswick on the mainland. Opened May 31, 1997, the 12.9 (km) bridge is Canada's longest bridge and the world's longest bridge over ice-covered water.Construction took place from October 1993 to May 1997 and cost C$1.3 billion. Before its official naming, Prince Edward Islanders often referred to the bridge as the "Fixed Link". It officially opened to traffic on May 31, 1997. In April 2022, the PEI legislature.

Confederation Bridge. voted unanimously in favour of renaming the bridge to "Epekwitk Crossing", whereas Epekwitk ( ) is the traditional Mi'kmaq name for Prince Edward Island. The name change would need to be approved by the Canadian federal government in order to take effect.## Structure.The bridge is a two-lane toll bridge that carries the Trans-Canada Highway between Borden-Carleton, Prince Edward Island (at Route 1) and Cape Jourimain, New Brunswick (at Route 16).It is a multi-span balanced cantilever bridge with a post-tensioned concrete box girder structure. Most of the curved bridge is 40 (m) above water with a 60 (m) navigation span for.

Confederation Bridge. the Dominion of Canada in 1873, the Canadian government was obligated to provide..."efficient steam service for the conveyance of mails and passengers to be established and maintained between the Island and the mainland of the Dominion, winter and summer, thus placing the Island in continuous communication with the Intercolonial Railway and the railway system of the Dominion..."Following Confederation, early steamship services across Northumberland Strait connected the Island ports of Charlottetown and Georgetown with railway facilities at Pictou, Nova Scotia. Similar services operated from Summerside connected with railway facilities at Shediac, New Brunswick.The most direct route across the Northumberland Strait, however,.

Confederation Bridge. were opened in October 1917. Automobile service was added in 1938 and other vessels followed as the ferry service expanded in the post-war years.This ferry service was initially the responsibility of Canadian Government Railways (1917–1918) and later Canadian National Railway (1918–1983), then a CNR subsidiary CN Marine (1977–1986). In 1986, CN Marine was renamed when all federal government ferry services in Atlantic Canada were transferred to the new Crown corporation Marine Atlantic.Ferry service years "Scotia I" (various years 1917–1957) "Scotia II" (various years 1937–1968) "Charlottetown" (1931–1941) "Abegweit" (1947–1982), renamed "Abby" (1983–1986) "Confederation" (1962–1976) "John Hamilton Gray" (1968–1997) "Lucy Maud Montgomery.

Confederation Bridge. link, in return for the province agreeing to the abandonment of the ferry service and the railway system.Following the election of the Progressive Conservative government of Brian Mulroney, with its agenda for regional development through so-called "mega-projects," Public Works Canada called for formal proposals in 1987 and received three offers. These proposals included a tunnel, a bridge, and a combined tunnel-causeway-bridge.These developments sparked an extremely divisive debate on the Island, and Premier Joe Ghiz promised a plebiscite to gauge public support, which was held on January 18, 1988.During the plebiscite debate, the anti-link group "Friends of the Island" cited potential.

Confederation Bridge. Development Inc. include: OMERS, an Ontario public servant pension fund (under the OMERS subsidiary BPC Maritime Corporation) VINCI Concessions Canada Inc., Montreal, Quebec Strait Crossing Inc., Calgary, Alberta (at one time part of the W. A. Stephenson / Stephenson Construction International (SCI) Engineers & Constructors Group of Companies)## Constitutional amendment.As mentioned, the in the Constitution of Canada required steamship service to connect the Island's railway system with that of mainland North America. A dedicated ferry service replaced the steamships in 1917, but no changes were made to the constitution. The fixed crossing, however, required a constitutional amendment (see Amendments to.

Confederation Bridge. the Constitution of Canada).The (Prince Edward Island) dealt with this issue, as well as the issue of tolls on the crossing. It made clear that the government (or a private body) could charge a toll (an essential part of the government's financing plans) for the crossing without violating the terms of union:"That a fixed crossing joining the Island to the mainland may be substituted for the steam service referred to in this Schedule... That, for greater certainty, nothing in this Schedule prevents the imposition of tolls for the use of such a fixed crossing between the Island and the mainland,.

Confederation Bridge. or the private operation of such a crossing;"## Construction.The construction, which was carried out by a construction joint venture of Ballast Nedam, GTMI (Canada), Northern Construction and Strait Crossing Inc., started in the fall of 1993, beginning with preparation of staging facilities. Bridge components were built year-round from 1994 to the summer of 1996, and placement of components began in the fall of 1994 until the fall of 1996. Approach roads, toll plazas, and final work on the structure continued until the spring of 1997, at an estimated total cost of $1 billion.All bridge components were constructed on land, in.

Confederation Bridge. throughout the province, finding use in the name of a Northumberland Ferries Limited vessel (M/V "Confederation"), a performing arts centre and art gallery (Confederation Centre of the Arts), a shopping centre (Confederation Court Mall), and the province-wide rails to trails system (Confederation Trail), as well as in tourism promotions (e.g., "Birthplace of Confederation").The President of Ireland, Mary McAleese, during a state visit to Canada in 1998, referred to the bridge as the "Span of Green Gables".## Finishing.After completing the structure on November 19, 1996, SCI worked throughout the winter, paving the bridge deck, placing bridge concrete barrier guardrails which also.

Confederation Bridge. the opening for traffic.In the days following the opening of the bridge, ferry operator Marine Atlantic disposed of its four vessels. The ferry terminals and docks in both ports were removed over the summer of 1997.## Operation.The bridge is operated by Strait Crossing Bridge Limited (SCBL), a subsidiary of the Strait Crossing Development Inc. consortium which built the structure. SCBL will privately manage, maintain, and operate the bridge until 2032, when these operations will transfer to the Government of Canada.The Government of Canada agreed to pay about $44 million a year for 33 years to Strait Crossing Development Inc., this.

Confederation Bridge. tourists visiting Prince Edward Island increased from 740,000 in 1996 (the year before the bridge opened) to 1,200,000 in 1997, but this dropped back to about 900,000 visitors annually.As a way of further promoting the island's new accessibility, the province issued vehicle licence plates from 1999 to 2006 that featured a likeness of the Confederation Bridge between the serial number. These plates, along with four other designs, started being replaced by a single design in 2013. List of bridges in Canada List of bridges by length Newfoundland–Labrador fixed link, a similar proposal to connect the island of Newfoundland to the.


Question: Who is the discoverer or inventor of this object?

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Cruise control. and mechanical engineer Ralph Teetor. He came up with the idea due to being frustrated by his driver's habit of speeding up and slowing down as he talked. A more significant factor in the developing of cruise control was the 35 (mph) speed limit imposed in the US during World War II to reduce gasoline use and tire wear. A mechanism controlled by the driver provided resistance to further pressure on the accelerator pedal when the vehicle reached the desired speed. Teetor's idea of a dashboard speed selector with a mechanism connected to the driveshaft and a device able to.


Question: What is this plant named after?

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Lilium humboldtii. Lilium humboldtii, or Humboldt's lily, is a species of lily native to the US state of California and the Mexican state of Baja California. It is named after naturalist and explorer Alexander von Humboldt. It is native to the South High Cascade Range, High Sierra Nevada, south Outer South Coast Ranges, and the Santa Monica Mountains and others in Southern California, growing at elevations from 600 (m) to 1200 (m).## Description."Lilium humboldtii" grows up to 6 (ft) tall, with flowers that are maroon-spotted, golden-orange with dark red splotches, with orange to brown stamens. The plant flowers in June, with flowers.


Question: Which place is this animal endemic to?

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Cane toad. The cane toad (Rhinella marina), also known as the giant neotropical toad or marine toad, is a large, terrestrial true toad native to South and mainland Central America, but which has been introduced to various islands throughout Oceania and the Caribbean, as well as Northern Australia. It is a member of the genus "Rhinella", which includes many true toad species found throughout Central and South America, but it was formerly assigned to the genus "Bufo".The cane toad is an old species. A fossil toad (specimen UCMP 41159) from the La Venta fauna of the late Miocene in Colombia is indistinguishable.

Cane toad. from modern cane toads from northern South America. It was discovered in a floodplain deposit, which suggests the "R. marina" habitat preferences have long been for open areas. The cane toad is a prolific breeder; females lay single-clump spawns with thousands of eggs. Its reproductive success is partly because of opportunistic feeding: it has a diet, unusual among anurans, of both dead and living matter. Adults average 10 – 15 (cm) in length; the largest recorded specimen had a snout-vent length of 24 (cm).The cane toad has poison glands, and the tadpoles are highly toxic to most animals if ingested.

Cane toad. "Dominican toad", "giant marine toad", and "South American cane toad". In Trinidadian English, they are commonly called "crapaud", the French word for toad.The genus "Rhinella" is considered to constitute a distinct genus of its own, thus changing the scientific name of the cane toad. In this case, the specific name "marinus" (masculine) changes to "marina" (feminine) to conform with the rules of gender agreement as set out by the International Code of Zoological Nomenclature, changing the binomial name from "Bufo marinus" to "Rhinella marina"; the binomial "Rhinella marinus" was subsequently introduced as a synonym through misspelling by Pramuk, Robertson, Sites,.

Cane toad. and Noonan (2008). Though controversial (with many traditional herpetologists still using "Bufo marinus") the binomial "Rhinella marina" is gaining in acceptance with such bodies as the IUCN, Encyclopaedia of Life, Amphibian Species of the World and increasing numbers of scientific publications adopting its usage.Since 2016, cane toad populations native to Mesoamerica and northwestern South America are sometimes considered to be a separate species, "Rhinella horribilis".In Australia, the adults may be confused with large native frogs from the genera "Limnodynastes", "Cyclorana", and "Mixophyes". These species can be distinguished from the cane toad by the absence of large parotoid glands behind their.

Cane toad. toads lose the toxicity that protected them as eggs and tadpoles, but have yet to fully develop the parotoid glands that produce bufotoxin. Only an estimated 0.5% of cane toads reach adulthood, in part because they lack this key defense - but also due to tadpole cannibalism. Although cannibalism does occur in the native population in South America, the rapid evolution occurring in the unnaturally large population in Australia has produced tadpoles 30x more likely to be "interested" in cannibalising their siblings, and 2.6x more likely to actually "do so". They have also evolved to shorten their tadpole phase in.

Cane toad. Saw-shelled Turtles have also been seen successfully and safely eating cane toads.## Distribution.The cane toad is native to the Americas, and its range stretches from the Rio Grande Valley in South Texas to the central Amazon and southeastern Peru, and some of the continental islands near Venezuela (such as Trinidad and Tobago). This area encompasses both tropical and semiarid environments. The density of the cane toad is significantly lower within its native distribution than in places where it has been introduced. In South America, the density was recorded to be 20 adults per 100 m (109 yd) of shoreline, 1.

Cane toad. in spite of the failure of the earlier introductions. On September 8, 2013, the cane toad was also discovered on the island of New Providence in the Bahamas.## The Philippines.The cane toad was first introduced deliberately into the Philippines in 1930 as a biological control agent of pests in sugarcane plantations, after the success of the experimental introductions into Puerto Rico. It subsequently became the most ubiquitous amphibian in the islands. It still retains the common name of "bakî" or "kamprag" in the Visayan languages, a corruption of 'American frog', referring to its origins. It is also commonly known as.

Cane toad. 17 months. The toads were sent to the other islands, and more than 100,000 toads were distributed by July 1934; eventually over 600,000 were transported.## Uses.Other than the use as a biological control for pests, the cane toad has been employed in a number of commercial and noncommercial applications. Traditionally, within the toad's natural range in South America, the Embera-Wounaan would "milk" the toads for their toxin, which was then employed as an arrow poison. The toxins may have been used as an entheogen by the Olmec people. The toad has been hunted as a food source in parts of.


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Acer macrophyllum. gold and yellow, contrasting against backdrops of evergreen conifers.In spring, the tree produces flowers in pendulous racemes 10 - 15 (cm) long, greenish-yellow with inconspicuous petals. It is hermaphroditic, bearing both male and female flowers in each raceme. The flowers appear in early spring, before the leaves.The fruit is a paired winged samara, each seed 1 - 1.5 (cm) in diameter with a 4 - 5 (cm) wing. Bigleaf maple begins bearing seed at about ten years of age.In May 2018 the oldest two Oregon maples in Europe, 175 years old, were removed from Trinity College Dublin (TCD), Ireland. The.


Question: What is the closest parent taxonomy of this bird?

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Common yellowthroat. The common yellowthroat (Geothlypis trichas) is a New World warbler. In the U.S. Midwest, it is also known as the yellow bandit. It is an abundant breeder in North America, ranging from southern Canada to central Mexico. The genus name "Geothlypis" is from Ancient Greek "geo", "ground", and "thlupis", an unidentified small bird; "thlypis" is often used in the scientific names of New World warblers. The specific "trichas" is also from Greek; ' is a kind of thrush, the word being derived from ', "hair".## Description.Common yellowthroats are small songbirds that have olive backs, wings and tails, yellow throats and.

Common yellowthroat. the United States.Common Yellowthroat Species Account - Cornell Lab of OrnithologyCommon yellowthroat - "Geothlypis trichas" - USGS Patuxent Bird Identification InfoCenterCommon yellowthroat at "Animal Diversity Web" Common yellowthroat bird sound at Florida Museum of Natural History.


Question: What country does this facility belong to?

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Quay with Sphinxes. Quay with Sphinxes (Sphinxes at the Universitetskaya Embankment) is a quay at the Universitetskaya Embankment in Saint Petersburg, in front of the Imperial Academy of Arts. It is remarkable for the two ancient sphinxes that were brought from Egypt to Russia at the height of Egyptomania in 1832. The quay was completed in 1834.## History.The acquisition of sphinxes at the University embankment in front of the Academy of Arts in St. Petersburg is credited to Andrei Muravyov, who in 1830 was going on a pilgrimage to holy places. In Alexandria he saw the sphinxes, which were brought for sale. The.

Quay with Sphinxes. ancient sculptures impressed so much that he immediately sent a letter to the Russian Ambassador, in which he proposed to acquire them. From the Embassy the letter was directed to St. Petersburg. There its receiver, Nicholas I, redirected the message to the Russian Academy of Arts. In the end, such a purchase was deemed expedient, but by the time these bureaucratic complications were resolved, the owner had already sold the sphinxes to France. Only because of the French Revolution they at last arrived in Saint Petersburg in 1832.The first two years they spent in the courtyard of the Russian Academy.

Quay with Sphinxes. of Arts. This time was spent on the creation of a pier made of syenite at the embankment nearby, which was designed by the architect Konstantin Thon. The sphinxes took their places on the waterfront in 1834.## Description.The Saint Petersburg Sphinxes are about 3500 years old. They are made from Aswan granite and initially were in front of a magnificent temple, which was built in Egypt near Thebes (Luxor) for the 18th dynasty pharaoh Amenhotep III. Their faces are portraits of Amenhotep III and the shape of their headwear (crowns "pa shemti") indicate that he was the ruler of two.

Quay with Sphinxes. kingdoms—the Upper Egypt and Lower Egypt. The sphinxes weigh about 23 tons each. Universitetskaya Embankment Egyptian Bridge Cultural heritage of Russia, monument #7810705002, Пристань со сфинксами фараона Аменхотепа III «Петербургские сфинксы. Солнце Египта на берегах Невы»—СПб.: Издательство «Журнал “Нева”», 2005,—304 с., ил.


Question: What is the location of this island?

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Confederation Bridge. voted unanimously in favour of renaming the bridge to "Epekwitk Crossing", whereas Epekwitk ( ) is the traditional Mi'kmaq name for Prince Edward Island. The name change would need to be approved by the Canadian federal government in order to take effect.## Structure.The bridge is a two-lane toll bridge that carries the Trans-Canada Highway between Borden-Carleton, Prince Edward Island (at Route 1) and Cape Jourimain, New Brunswick (at Route 16).It is a multi-span balanced cantilever bridge with a post-tensioned concrete box girder structure. Most of the curved bridge is 40 (m) above water with a 60 (m) navigation span for.

Confederation Bridge. act as wind barriers, placing bridge deck and navigational lighting, constructing the Borden-Carleton toll plaza, and finishing the New Brunswick and Prince Edward Island approach roads. In separate construction, the federal and provincial governments built a new commercial and tourist development on the abandoned CN rail yards in Borden-Carleton, with phase I of this facility opening in spring 1997 as "Gateway Village". New Brunswick has never received similar federal support to improve the economy of Cape Tormentine, which has become a shadow of its former role in PEI transportation history, although in recent years a new eco-tourist and visitor centre.


Question: Which city or region does this lake locate in?

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Zürichhorn. Zürichhorn is a river delta on Zürichsee's eastern shore in the lower basin of the lake. The area is part of the parks and quays in the Seefeld quarter of the city of Zürich in Switzerland. The gardens are one of the most popular recreational areas within the city of Zürich.## Geography.Zürichhorn was formed mainly by the "Hornbach" stream, also known as "Wildbach" and "Werenbach", which flows, as of today embedded into a concrete canal, between "Tiefenbrunnen" lido and the landing gate of the Zürichsee-Schifffahrtsgesellschaft (ZSG) into Lake Zürich. Ending the last glacial period when the Linth glacier retreated, the.

Zürichhorn. "Wehrenbach" stream dug over through the Linth glacier's moraine, met the rocky ground, the so-called molasse, and by its attachment the river delta at the Zürichhorn respectively the Seefeld quarter was formed.## Transportation.Zürichhorn can be reached preferably by foot (20 minutes from Bellevue) or by public transportation: Zürich tram routes 2 and 4 and bus line 33 to stops "Höschgasse" or "Fröhlichstrasse", or bus lines 912 and 916 from "Bellevue" to "Chinagarten". During summer season, three Limmat boats provide round trips between Landesmuseum–Wollishofen–Zürichhorn-Landesmuseum on the river Limmat through the city of Zürich respectively Zürichhorn is a stop of the roundtrips.

Zürichhorn. on Lake Zürich provided by Zürichsee-Schifffahrtsgesellschaft (ZSG).## Water airport Zürichhorn.In summer 1910 "Wagenfabrik C. & R. Geissberger" provided first test flights with so-called "Hydroplanes" (flying boats) at Zürichhorn. Initiated by Oskar Bider and Fritz Rihner, in July 1919 the «Schweizerische Gesellschaft für Lufttourismus» was established in Zürich. Tourist flights with flying boats were planned from sites at Zürichhorn, in Geneva, Interlaken/Thun, Locarno, Lugano, Lucerne, Lausanne-Ouchy, Romanshorn and St. Moritz. Switzerland, with its numerous lakes, appeared predestined for the use of seaplanes, so that no expensive airports had to be built. Oskar Bider was killed in an accident before the ambitious.

Zürichhorn. project was realized, but from Zürichhorn respectively (as of 2010) the area of the "Strandbad Tiefenbrunnen" (lido) the Swiss airline Ad Astra Aero operated with seaplanes, among them seven Macchi-Nieuport and five Savoia flying boats and the first large flying boat, Dornier Wal.## Quaianlagen.Hafen Riesbach, meaning Riesbach harbour area is situated between Seefeldquai and Blatterwiese. The harbour itself is as the Enge harbour used as a private-owned marina. In 2004 the old kiosk at the popular open lido at "Riesbachstrasse" was replaced by a polygonal pavilion was designed by the architects Andreas Furrimann and Gabrielle Hächler, and now houses a.

Zürichhorn. small restaurant. As well as the Seefeldquai, it is part of the historical Quaianlagen, and combines park designs from different design periods. The stone pillar "Klausstud" originally stood in the lake and served as a border designation of the medieval right of ban of the city republic of Zürich. At that place also ended the fishing rights of the urban fishermen, and from here the Einsiedeln Abbey pilgrims proved their honour to the Protestantic city by lowering the volume of their prayers and songs. Since the landfills in the construction of the quais, the pillar stands in the middle of.

Zürichhorn. the park. The sculpture by Henry Moore is named "Sheep Peace", and was donated in 1976. The Pavillon Le Corbusier, an art museum dedicated to the work of the Swiss architect Le Corbusier, is situated between Seefeldquai and Blatterwiese. Between Blatterwiese and "Bellerivestrasse", in 1993 the Chinese Garden Zürich was inaugurated.Sights include the spacious parks and quais with various sculptures including Jean Tinguely's "Heureka", "Chinagarten Zürich" at Blatterwiese, and in the northeast the last by Le Corbusier designed building, the formerly named "Heidi-Weber-Museum" respectively Pavillon Le Corbusier. On the southeastern side of the delta is the "Strandbad Tiefenbrunnen" located. The.

Zürichhorn. "Restaurant Fischstube" was built as part of the Swiss national exhibition 1939, it acclaims to be the only house within the city of Zürich with a thatched roof.Among the many major events at Zürichhorn are the "Schweizerische Landesausstellung" 1939 (Swiss national exposition, commonly "Landi39"), "Schweizerische Gartenbauausstellung G59" in 1959, and in 1991 the national research exhibition "Heureka". Since 1989, "Kino am See" (cinema on lake), the largest open-air cinema in Switzerland, will take place between mid-July and mid-August at Zürichhorn on Lake Zürich shore. The lakeside parks are annually frequented by 2.5 million visitors.## History.In 1238 the "Otinbach" stream is.

Zürichhorn. first mentioned, which can be derived from "Otto's stream" respectively Old High German "ôt" meaning heritage. The then used name "Oetenbach" may refer to the river on whose banks an estate, fishing or other rights were situated. About the same time, at Zürichhorn was the Oetenbach Nunnery established, lacking experience on swampy ground; therefore around 1280/85 the Dominican sisters of the convent moved to "Sihlbühl" at Lindenhof hill within the fortifications of the city of Zürich, and also to finance the northern town wall.In the 16/17th century rich Zürich citizens built their country seats outside the town walls of the.

Zürichhorn. city of Zürich on lakeshore in the Seefeld quarter. In the 1840s several construction companies settled around Zürichhorn: Raw material was delivered on the lake respectively shore-based on (as of today) "Fröhlichstrasse". The then "Hornegg" was developed until the end of the 19th century as the local center of construction and ship building companies. In 1894 the railway line "Rechtsufrige Zürichseebahn" was established, since then most of the companies moved to the more attractive Industriequartier in the western parts of the city of Zürich.1879/81 the "Wildbach" has been corrected to avoid recurrent floodings of the former municipality of Riesbach (as.

Zürichhorn. of today Zürich's district number 8). The stream was discharged to the south of Lake Zürich, and from then, it was called "Hornbach" nearby its mouth. Opening the Lake Zürich quais, in 1887 the park area was expanded from "Seefeld-Quai" to Zürichhorn, in order to promote "companionship, recreation and amusement". A spacious park landscape was built by the landscape architects Otto Froebel and Evariste Mertens.## Cultural heritage of national importance.Zürichhorn is listed in the Swiss inventory of cultural property of national and regional significance as a "Class A" object of national importance.


Question: What is the closest parent taxonomy of this plant?

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Pseudopanax crassifolius. Pseudopanax crassifolius, the horoeka or lancewood, is a New Zealand native tree belonging to the family Araliaceae. It is found throughout New Zealand from sea level up to about 750 m. The juvenile form, which lasts for between 15 and 20 years, is very easily recognized. The leaves are stiff and leathery with a prominent central rib, about 1 cm wide and up to 1 m long with irregular teeth, all growing downwards from a central stem. The young trunk has characteristic vertical swollen ridges. As the tree gets older the stem begins to branch, producing a bushy top, and.

Pseudopanax crassifolius. the leaves become wider and shorter, losing their teeth. It is only when the tree is mature that it adopts a typical tree shape.One of the theories about this curious change of appearance is that the young plant had to protect itself against browsing by the moa, the giant flightless bird that roamed New Zealand's bush in prehistoric times. Once above moa height, it was out of danger and turns into a "regular" tree. A study of leaf colour development in "P. crassifolius" found that leaves of seedlings would blend with leaf litter, while juvenile leaf colouration would draw attention.

Pseudopanax crassifolius. to their spines. A closely related Chatham Island species, which evolved in the absence of moa, did not display these changes.Closely related is "Pseudopanax ferox", the toothed lancewood. It is similar to "P. crassifolius" except the leaves are more abundant and severely toothed, resembling remotely a bandsaw blade. Salmon J T, "The Native Trees of New Zealand", AH & AW Reed Ltd, Wellington, New Zealand, 1973. ."Flora of New Zealand", URL:"Pseudopanax crassifolius"."New Zealand Plant Conservation Network", "Pseudopanax crassifolius".