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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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Marble Bridge. The Siberian Marble Gallery is a decorative pedestrian roofed Palladian bridge (gallery walkway) in Empress Catherine Park in the former royal residence Tsarskoye Selo (now town of Pushkin) near Saint Petersburg, Russia. It connects the Swan Islands — an artificial archipelago of seven islets in the landscape park of Tsarskoe Selo — spanning a rivulet flowing between several ponds. The bridge was modelled after the Palladian Bridge (1736) in the park of Wilton House, in England, and served as a showcase for Ural marble. All the details of the bridge — including the granite Ionic colonnade — were produced in.


Question: What is the hymenium type of this plant?

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Astraeus hygrometricus. common in temperate and tropical regions. Its common names refer to the fact that it is hygroscopic (water-absorbing), and can open up its rays to expose the spore sac in response to increased humidity, and close them up again in drier conditions. The rays have an irregularly cracked surface, while the spore case is pale brown and smooth with an irregular slit or tear at the top. The gleba is white initially, but turns brown and powdery when the spores mature. The spores are reddish-brown, roughly spherical with minute warts, measuring 7.5–11 micrometers in diameter.Despite a similar overall appearance, "A.

Astraeus hygrometricus. alternate spelling of "Geastrum"). According to the American botanist Andrew P. Morgan, however, the species differed from those of "Geastrum" in not having open chambers in the young gleba, having larger and branched capillitium threads, not having a true hymenium, and having larger spores. Accordingly, Morgan set Persoon's "Geaster hygrometricum" as the type species of his new genus "Astraeus" in 1889. Despite Morgan's publication, some authorities in the following decades continued to classify the species in "Geastrum". The New-Zealand based mycologist Gordon Herriot Cunningham explicitly transferred the species back to the genus "Geastrum" in 1944, explaining: The treatment of this.

Astraeus hygrometricus. species by certain taxonomists well illustrates the pitfalls that lie in wait for those who worship at the shrine of ontogenic classification ... The only feature of those outlined in which the species differs from others of "Geastrum" is the somewhat primitive hymenium. In the developing plant the glebal cavities are separated by tramal plates so tenuous as to be overlooked by the uncritical worker. Each cavity is filled with basidia somewhat irregularly arranged in clusters (like those of "Scleroderma") and not in the definite palisade of the species which have been studied. This difference disappears as maturity is reached,.

Astraeus hygrometricus. interior of the spore case, the gleba, is white and solid when young, and divided into oval locules—a characteristic that helps to distinguish it from "Geastrum". The gleba becomes brown and powdery as the specimen matures. Small dark hairlike threads (rhizomorphs) extend from the base of the fruit body into the substrate. The rhizomorphs are fragile, and often break off after maturity.The spores are spherical or nearly so, reddish-brown, thick-walled and verrucose (covered with warts and spines). The spores' dimensions are 7–11 µm; the warts are about 1 µm long. The spores are non-amyloid, and will not stain with iodine.

Astraeus hygrometricus. published before it was known that North American and Asian versions of "A. hygrometricus" were not always the same; in some cases Asian specimens have been identified as new species, such as "A. asiaticus" and "A. odoratus".## Similar species.Although "A. hygrometricus" bears a superficial resemblance to members of the "true earthstars" "Geastrum", it may be readily differentiated from most by the hygroscopic nature of its rays. Hygroscopic earthstars include "G. arenarium", "G. corollinum", "G. floriforme", "G. recolligens", and "G. kotlabae". Unlike "Geastrum", the young fruit bodies of "A. hygrometricus" do not have a columella (sterile tissue in the gleba, at.

Astraeus hygrometricus. moist soil. The spore ornamentation of "A. odoratus" is also distinct from "A. hygrometricus", with longer and narrower spines that often joined. "A. asiaticus" has an outer peridial surface covered with small granules, and a gleba that is purplish-chestnut in color, compared to the smooth peridial surface and brownish gleba of "A. hygrometricus". The upper limit of the spore size of "A. asiaticus" is larger than that of its more common relative, ranging from 8.75 to 15.2 μm. "A. koreanus" (sometimes named as the variety "A. hygrometricus" var. "koreanus"; see Taxonomy) differs from the more common form in its smaller.


Question: Who is the owner of this place?

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Blenheim Palace. Blenheim Palace (pronounced ) is a country house in Woodstock, Oxfordshire, England. It is the seat of the Dukes of Marlborough and the only non-royal, non-episcopal country house in England to hold the title of palace. The palace, one of England's largest houses, was built between 1705 and 1722, and designated a UNESCO World Heritage Site in 1987.The palace is named after the 1704 Battle of Blenheim, and thus ultimately after Blindheim (also known as Blenheim) in Bavaria. It was originally intended to be a reward to John Churchill, 1st Duke of Marlborough for his military triumphs against the French.

Blenheim Palace. 1720s. It is unique in its combined use as a family home, mausoleum and national monument. The palace is notable as the birthplace and ancestral home of Sir Winston Churchill.Following the palace's completion, it became the home of the Churchill (later Spencer-Churchill) family for the next 300 years, and various members of the family have wrought changes to the interiors, park and gardens. At the end of the 19th century, the palace was saved from ruin by funds gained from the 9th Duke of Marlborough's marriage to American railroad heiress Consuelo Vanderbilt.## Churchills.John Churchill was born in Devon. Although his.

Blenheim Palace. and outlined his remit. Unfortunately for the Churchills, nowhere did this warrant mention Queen or Crown.The Duke of Marlborough contributed £60,000 to the initial cost when work commenced in 1705, which, supplemented by Parliament, should have built a monumental house. Parliament voted funds for the building of Blenheim, but no exact sum was mentioned nor provision for inflation or over-budget expenses. Almost from the outset, funds were spasmodic. Queen Anne paid some of them, but with growing reluctance and lapses, following her frequent altercations with the Duchess. After their final argument in 1712, all state money ceased and work came.

Blenheim Palace. 5th Duke of Marlborough (1766–1840), a spendthrift who considerably depleted the family's remaining fortune. He was eventually forced to sell other family estates, but Blenheim was safe from him as it was entailed. This did not prevent him selling the Marlboroughs' Boccaccio for a mere £875 and his own library in over 4000 lots. On his death in 1840, his profligacy left the estate and family with financial problems.By the 1870s, the Marlboroughs were in severe financial trouble and in 1875 the 7th Duke sold the "Marriage of Cupid and Psyche", together with the famed Marlborough gems, at auction for.

Blenheim Palace. remained beyond the Marlboroughs' resources. These had always been small in relation to their ducal rank and the size of their house. The British agricultural depression, which started in the 1870s, added to the family's problems. When the 9th Duke inherited in 1892, the land was generating dwindling income.## 9th Duke of Marlborough.Charles, 9th Duke of Marlborough (1871–1934) can be credited with saving both the palace and the family. Inheriting the near-bankrupt dukedom in 1892, he was forced to find a quick and drastic solution to the problems. Prevented by the strict social dictates of late 19th-century society from earning.

Blenheim Palace. shocked society and left her husband, finally divorcing in 1921. She subsequently married a Frenchman, Jacques Balsan. She died in 1964, having lived to see her son become Duke of Marlborough, and frequently returning to Blenheim, the house she had hated and yet saved, albeit as the unwilling sacrifice.After his divorce the Duke married again, to a former friend of Consuelo, Gladys Deacon, another American. This eccentric lady was of an artistic disposition, and a painting of her eyes still remains on the ceiling of the great north portico ("see secondary lead image"). A lower terrace was decorated with sphinxes.

Blenheim Palace. They subsequently separated but did not divorce. The Duke died in 1934 and his widow in 1977.The 9th Duke was succeeded by his and Consuelo Vanderbilt's eldest son: John, 10th Duke of Marlborough (1897–1972), who after eleven years as a widower, remarried at the age of 74, to (Frances) Laura Charteris, formerly the wife of the 2nd Viscount Long and the 3rd Earl of Dudley, and granddaughter of the 11th Earl of Wemyss. The marriage was short-lived, however; the Duke died just six weeks later, on 11 March 1972. The bereaved Duchess complained of "the gloom and inhospitality of Blenheim.

Blenheim Palace. after his death, and soon moved out. In her autobiography, "Laughter from a Cloud" (1980), she referred to Blenheim Palace as "The Dump". She died in London in 1990.## Second World War.During the war the 10th Duke welcomed the boys from Malvern College as evacuees, and in September 1940 allowed the Security Service (MI5) to use the palace as its base until the end of the war.## The palace today.The palace remains the home of the Dukes of Marlborough, the present incumbent of the title being Charles James (Jamie) Spencer-Churchill, 12th Duke of Marlborough. Charles James succeeded to the Dukedom.


Question: On what date did this building officially open?

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Pro Football Hall of Fame. Village, an estimated $900 million expansion project adjacent to the Pro Football Hall of Fame, has completed Phase I of construction; preparations for beginning Phase II are currently underway.Dick McCann (April 4, 1962 – November 1967)Dick Gallagher (April 1968 – December 31, 1975)Pete Elliott (February 1979 – October 31, 1996)John Bankert (November 1, 1996 – December 31, 2005)Steve Perry (April 24, 2006 – January 2014)David Baker (January 6, 2014 – October 16, 2021)Jim Porter (2021 – present)## Inductees.Through 2021, all players in the Hall, except Buffalo Bills guard Billy Shaw, played at least some part of their professional career in.

Pro Football Hall of Fame. 2002, the ceremony was moved to Fawcett Stadium (now Tom Benson Hall of Fame Stadium), where it was held from 1963 to 1965. Since 2007, the enshrinement ceremony has been held on the Saturday night, since 2017 two days after the Hall of Fame Game. In 2022, the ceremony was moved to noon ET.## Hall of Fame Game.The Hall of Fame Game, the annual NFL preseason opener, is played in Tom Benson Hall of Fame Stadium at Hall of Fame Village in Canton, Ohio. In 2017, the Hall of Fame Game was held for the first time on Thursday night.


Question: What is the location of this building?

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Bodrum Castle. Bodrum Castle () is a historical fortification located in southwest Turkey in the port city of Bodrum (), built from 1402 onwards, by the Knights of St John as the Castle of St. Peter or "Petronium". A transnational effort, it has four towers known as the English, French, German, and Italian towers, bearing the names of the nations responsible for their construction. The castle was completed in the late 15th century, only to be taken over by the Islamic Ottoman Empire in 1523. The chapel was converted to a mosque, and a minaret was added. The castle remained under the.

Bodrum Castle. empire for almost 400 years. After remaining empty following World War I, in the early 1960s, the castle became the home for the award-winning Bodrum Museum of Underwater Archaeology (see below). In 2016 it was inscribed in the Tentative list of World Heritage Sites in Turkey.## History.Confronted by the now firmly established Ottoman Sultanate, the Knights Hospitaller, whose headquarters were on the island of Rhodes, needed another stronghold on the mainland. Grand Master Philibert de Naillac (1396–1421) identified a suitable site across from the island of Kos, where a castle had already been built by the Order. Its location was.

Bodrum Castle. the site of a fortification in Doric times (1110 BC) as well as of a small Seljuk castle in the 11th century. The same promontory is also the probable site of the Palace of Mausolos, the famous King of Caria. In his travel diary "Travels In Asia Minor", Charles Boileau Elliot describes this palace as the Palace of Mausolus with absolute certainty, and this account was written in the year 1840.The construction of the castle began in 1404 under the supervision of the German knight architect Heinrich Schlegelholt. Construction workers were guaranteed a reservation in heaven by a Papal Decree.

Bodrum Castle. of 1409. They used squared green volcanic stone, marble columns and reliefs from the nearby Mausoleum of Halicarnassus to fortify the castle.The first walls were completed in 1437. The chapel was among the first completed inner structures (probably 1406). It consists of a vaulted nave and an apse. The chapel was reconstructed in Gothic style by Spanish Knights of Malta in 1519–1520. Their names can be found on two cornerstones of the façade. Fourteen cisterns for collecting rainwater were excavated in the rocks under the castle. This was a monumental achievement of the day and the family who completed the.

Bodrum Castle. excavation were given the honorific of "Burrows" for their exceptional digging skills.Each langue of the Order had its own tower, each in its own style. Each tongue, each headed by a Bailiff, was responsible for the maintenance and defense of a specific portion of the fortress and for manning it with sufficient numbers of knights and soldiers. There were seven gates leading to the inner part of the fortress.The architect applied the latest features in castle design; the passages leading to the gates were full of twists and turns. Eventual assailants could not find cover against the arrows, stones or.

Bodrum Castle. heated projectiles they had to confront. The knights had placed above the gates and on the walls hundreds of painted coats of arms and carved reliefs. Two hundred and forty-nine separate designs still remain, including those of grand masters, castle commandants, countries, and personal coat of arms of knights and religious figures.The construction of the three-storied English tower was finished in 1413. One door opens to the north, to the inner part of the castle, while the other leads to the western rampart. One could only access this tower via a drawbridge. The western façade shows an antique carved relief.

Bodrum Castle. of a lion. Because of this relief, the tower was also called "the Lion Tower". Above this lion, one can see the coat of arms of King Henry IV of England.For over a century St. Peter's Castle remained the second most important castle of the Order. It served as a refuge for all Christians in Asia Minor.The castle came under attack with the rise of the Ottoman Empire, first after the fall of Constantinople in 1453 and again in 1480 by Sultan Mehmed II. The attacks were repelled by the Knights of St John. In 1482, Prince Cem Sultan, son.

Bodrum Castle. of Sultan Mehmed II and brother of Sultan Bayezid II, sought refuge in the castle, after a failure in raising a revolt against his brother.When the Knights decided to fortify the castle in 1494, they used stones from the Mausoleum once again. The walls facing the mainland were thickened in order to withstand the increasing destructive power of cannon. The walls facing the sea were less thick, since the Order had little to fear from a sea attack due to their powerful naval fleet. Grand Master Fabrizio del Carretto (1513–21) built a round bastion to strengthen the land side of.

Bodrum Castle. the fortress. Sir Thomas Docwra was appointed Captain of the Castle in 1499.Despite their extensive fortifications, the Crusaders's towers were no match for the forces of Süleyman the Magnificent, who overpowered the knights in 1523. Under the Ottoman rule, the castle's importance waned, and in 1895 it was converted into a prison.## 16th century.Between 1505 and 1507 the few sculptures from the mausoleum that had not been smashed and burnt for lime were integrated into the castle for decoration. These included twelve slabs of the Amazonomachy (combat between Amazons and Greeks) and a single block of the Centauromachy, a few.

Bodrum Castle. standing lions, and one running leopard.When faced with an attack from Sultan Suleiman, Philippe Villiers de L'Isle-Adam, the Grand Master of the Knights Hospitallers, ordered the Castle to be strengthened again. Much of the remaining portions of the mausoleum were broken up and used as building material to fortify the castle. By 1522 almost every block of the mausoleum had been removed.In June 1522 the sultan attacked the Order's headquarters in Rhodes from the Bay of Marmaris with 200,000 soldiers (Siege of Rhodes (1522)). The castle of Rhodes fell in December 1522. The terms of surrender included the handing over.

Bodrum Castle. of the Knights' fortresses in Kos and St Peter's Castle in Bodrum.After the surrender, the chapel was converted into a mosque and a minaret was added. This mosque was called the "Süleymaniye Camii", as attested by a traveler, Evliya Chelebi, who visited Bodrum in 1671. The minaret was destroyed on 26 May 1915 by rounds fired by a French warship during World War I. It was reconstructed in its original shape in 1997.## 19th century.In 1846 Lord Canning, HM Ambassador to Constantinople, obtained permission to remove twelve marble reliefs showing a combat between Greeks and Amazons from the castle. Sir.

Bodrum Castle. Charles Newton, a member of the staff of the British Museum, conducted excavations and removed a number of stone lions and one leopard in 1856. These are all still to be found today at the British Museum.In later years, the castle has been used for different purposes. It was used as a military base by the Turkish Army during the Greek Revolt in 1824. In the 19th century, the chapel which had been converted for use as a mosque had a minaret added. At the same time, a hamam (public bath) was installed in the castle. In 1895 the castle.

Bodrum Castle. was turned into a prison. During World War I, the castle was fired upon by a French warship, toppling the minaret and damaging several towers. After the Great War, the Italians established a garrison in the castle but withdrew in 1921 when Mustafa Kemal Atatürk came to power, when the castle stood empty for 40 years.## Museum of Underwater Archaeology.In 1962 the Turkish Government decided to turn the castle into a museum for the underwater discoveries of ancient shipwrecks in the Aegean Sea. This has become the Bodrum Museum of Underwater Archaeology, with a collection of amphoras, ancient glass, bronze,.

Bodrum Castle. clay, and iron items. It is the biggest museum of its kind devoted to underwater archaeology. Most of its collection dates from underwater excavations carried out by the Institute of Nautical Archaeology (INA) after 1960. These excavations were performed on several shipwrecks:Finike-Gelidonya shipwreck (12th century BC): 1958–1959; first underwater excavation in Turkey Bodrum-Yassiada shipwreck (Byzantine, 7th century AD): 1961–1964; Roman merchant vessel with 900 amphorasBodrum -Yassiada shipwreck (Late Roman, 4th century AD)Bodrum-Yassiada shipwreck (Ottoman, 16th century AD) (dated by a 16th-century four-real silver coin from Seville (Philip II) )Ṣeytan Deresi shipwreck (16th century BC)Serçe Limanı Shipwreck (glass, 11th century AD):.

Bodrum Castle. 1977; collection of Islamic glasswareMarmaris-Serçe harbour shipwreck (Hellenistic, 3rd BC)Kaṣ-Uluburun shipwreck (14th century BC): 1982–1995; 10 tons of Cypriot copper ingots; one ton of pure tin ingots; 150 glass ingots; manufactured goods; Mycenaean pottery; Egyptian seals (with a seal of queen Nefertiti) and jewelryTektaṣ Burnu Classical Greek shipwreck (5th century BC): 1999-2001The former chapel houses an exhibition of vases and amphoras form the Mycenaean age (14th to 12th centuries BC) and findings from the Bronze Age (around 2500 BC). The commercial amphoras give a historical overview of the development of amphoras and their varied uses.The Italian Tower houses a collection.

Bodrum Castle. spanning many centuries in the Coin and Jewelry Hall. Another exhibition room is devoted exclusively to the tomb of a Carian princess, who died between 360 and 325 BC. The collection of ancient glass objects is one of the four largest ancient glass collections in the world.Finally, two ancient shipwrecks have been reconstructed: the Fatımi ship, sunk in 1077 AD, and the large Uluburun Shipwreck from the 14th century BC.A garden inside the castle is a collection of almost every plant and tree of the Mediterranean region, including both the myrtle, and the plane tree. Turquoise and amber peacocks parade.

Bodrum Castle. under flowering trees and bushes. From the towers it is possible to see the entire city as well as some of the neighboring bays.BodrumHalicarnassusUluburun ShipwreckOrder of MaltaUnderwater Archeology Museum (Ministry of Culture and Tourism website)Bodrum museum virtual tour (pop-up on Ministry of Culture and Tourism website)Bodrum Castle information, photos and map of Bodrum Castle.


Question: What country does this aircraft belong to?

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Dornier Flugzeugwerke. Dornier Flugzeugwerke was a German aircraft manufacturer founded in Friedrichshafen in 1914 by Claude Dornier. Over the course of its long lifespan, the company produced many designs for both the civil and military markets.## History.Originally Dornier Metallbau, Dornier Flugzeugwerke took over Flugzeugbau Friedrichshafen production facilities (Weingarten, Warnemünde, and the former Zeppelin shed at Manzell) when it failed in 1923.Dornier was well known between the two world wars as a manufacturer of large, all-metal flying boats and of land based airliners. The record-breaking 1924 Wal () was used on many long distance flights and the Do X set records for its.

Dornier Flugzeugwerke. immense size and weight. Dornier's successful landplane airliners, including the Komet ("Comet") and Merkur ("Mercury"), were used by Lufthansa and other European carriers during the 1920s and early 30s. Dornier built its aircraft outside Germany during much of this period due to the restrictions placed on German aircraft manufacturers by the Treaty of Versailles: locations included Altenrhein, Switzerland, 12 km from Zeppelin's Lindau (Bodensee) location. Foreign factories licence-building Dornier products included CMASA and Piaggio in Italy, CASA in Spain, Kawasaki in Japan, and Aviolanda in the Netherlands. Once the Nazi government came to power and abandoned the treaty's restrictions, Dornier.

Dornier Flugzeugwerke. resumed production in Germany.The success of the Wal family encouraged the development of derivatives, and of more advanced successors, such as the Do 18, and Do 24 which saw service in several armed forces, including German, into World War II.Dornier's most important World War II military aircraft design was the Do 17, nicknamed "The Flying Pencil". It first flew in 1934 as a mailplane for Lufthansa but due to its narrow fuselage (hence its nickname) it was not commercially viable and was passed over. Dornier then developed it further as a military aircraft, with a prototype bomber flying in 1935,.

Dornier Flugzeugwerke. and in 1937 it was used in by the German Condor Legion during the Spanish Civil War. Production continued in Germany and it was developed to fill multiple roles for the Luftwaffe. As a medium bomber it saw service during the early part of World War II, particularly during the Battle of Britain. It was later developed into a nightfighter to counter the RAF bomber offensive. Dornier developed the similar looking Do 217 from the Do 17 but it was a larger and completely new design. Dornier also developed the fastest piston-engined fighter of the war, the twin-engined Do 335,.

Dornier Flugzeugwerke. which was too late to see service.After WWII, aircraft production was again forbidden in Germany, and Dornier relocated to Spain and then to Switzerland where the firm provided aeronautical consultancy services until returning to Germany in 1954. Post-war, Dornier re-established itself with successful STOL Do 27 and Do 28 utility planes. In 1974 it joined a joint venture with French aircraft manufacturers Dassault-Breguet to develop the Alpha Jet.In 1983, Hindustan Aeronautics Limited (HAL) acquired a production licence for the Dornier 228 and manufactured the aircraft for the Asian market. By 2013 a total of 117 Dornier 228 aircraft had been.

Dornier Flugzeugwerke. produced by HAL with plans to build 20 more during 2013-14.In 1985, Dornier became a member of the Daimler-Benz group, integrating its aeronautic assets with the parent company. As part of this transaction, Lindauer Dornier GmbH was spun off, creating a separate, family-owned firm, concentrating on textile machinery design and manufacturing. The rest of the company was split into several subsidiaries for defence, satellites, medtech and aircraft.In 1996, the majority of Dornier Aircraft was acquired by Fairchild Aircraft, forming Fairchild Dornier. This company became insolvent in early 2002. Production of its 328 Jet was acquired by US company Avcraft. Asian.

Dornier Flugzeugwerke. groups continued to show interest in its 728 version in August 2004, but production was not restarted. Dornier 228 production was taken over by Swiss manufacturer RUAG, who then sold it off to General Atomics in 2020. Other subsidiaries became part of the EADS.The medtech division was sold to an investment company and now bears the name Dornier MedTech. Dornier Medtech manufactures medical equipment, such as the "Dornier S lithotriptor", HM3, Compact Delta to treat kidney stones. Dornier MedTech also manufactures laser devices for a wide range of applications.## Dornier Seaplane Company.The Dornier family have a spin-off company and project,.

Dornier Flugzeugwerke. the Dornier Seastar. It is a turboprop-powered amphibious aircraft built largely of composite materials. This was developed by , and later by his son Cornado by Dornier Seawings.## Dornier Technologie.Claude's grandson, , founded Dornier Technologie in 1996 to manufacture the Dornier S-Ray 007. Dornier Gs Precursor to Wal destroyed by Military Inter-Allied Commission of Control (1919) Dornier Do A Libelle (I 1921, III redesignated Do 12) Dornier Spatz Landplane version of Do A (1922) Dornier Do B Merkur Development of Do C (1926) Dornier Do C Komet (I 1921, II 1922, III 1926) Dornier Do C 2, 3, 4 Fighter.

Dornier Flugzeugwerke. unrelated to earlier Do C, redesignated Do 10 (C 2 ?, C 3 1931, C 4 1932) Dornier Do D (1929) Dornier Do E (1924) Dornier Do F (1932, redesignated Do 11, 13, 23) Dornier Do G "Grief" (Cancelled 1920 project) Dornier Do H "Falke" (1922 development of Dornier-Zeppelin D.I) Dornier Do I (1923 twin engine long range reconnaissance aircraft) Dornier Do J Wal (1922) Dornier Do K (K 1 1929, K 2 1929, K 3 1931) Dornier Do L Delphin (I 1920, II 1921, III 1927) Dornier Do N Design for Japanese as Kawasaki Ka 87 (1926) Dornier Do.

Dornier Flugzeugwerke. O Wal Custom built version of Do J (1924) Dornier Do P (1930) Dornier Do R.2 and R.4 Superwal (1924) Dornier Do S (1930) Dornier Do T (Komet/Merkur converted to Air Ambulance) Dornier Do U (Cancelled civil variant of Do Y) Dornier Do X (1929) Dornier Do Y (1930, redesignated Do 15)## Dornier aircraft projects.## Letter designations (before 1933).Additional unbuilt projects include 3 different Schneider Trophy racers from 1924, 1928 and 1931 and a large multi-engine seaplane similar to the Do X with engines buried in the wings. Dornier Do 10 Dornier Do 11 Dornier Do 12 Dornier Do 13.

Dornier Flugzeugwerke. Do 27 Dornier Do 27 Dornier Do 28 - developed from Do 27 Dornier Do 29 Dornier Do 31 Dornier Do 32 Dornier 128 Dornier Do 132 Dornier 228 - developed from Do 28 Dornier Do 231 Dassault/Dornier Alpha Jet Dornier 328 Fairchild Dornier 328JET Fairchild Dornier 428JET Fairchild Dornier 728 family Dornier Aerodyne Dornier Seawings Seastar Dornier S-Ray 007 Dornier LA-2000 (Study for a stealth strike aircraft with full delta wing similar to A-12 Avenger) Dornier Delta Dornier Delta II, developed for Hymer## Dornier Faint Object Camera.Dornier GmbH built the Faint Object Camera for the Hubble Space Telescope, which.

Dornier Flugzeugwerke. was used from 1990 to 2002. The ESA funded the unit, which actually consists of two complete and independent camera systems designed to provide extremely high resolution, exceeding 0.05 arcseconds. It is designed to view very faint UV light from 115 to 650 nanometers in wavelength. It was the last original instrument on the Hubble when it was replaced by the Advanced Camera for Surveys in 2002. Dornier Viper AMC-5 (satellite) Project 621 (rocket)Dornier Museum FriedrichshafenList of RLM aircraft designationsZündapp Janus DFW's Web Page Dornier Museum Friedrichshafen.


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Palm tanager. The palm tanager ("Thraupis palmarum") is a medium-sized passerine bird. This tanager is a resident breeder from Nicaragua south to Bolivia, Paraguay and southern Brazil. It also breeds on Trinidad and, since 1962, on Tobago. In Trinidad and Tobago, it is known by colloquial names such as the "palmiste" on American Spanish countries (Colombian pronn: ""pūlmist"), Brazil Pipira-verde (Portuguese pron: "pəəpəərā-værd"") and the "green jean" in American English.## Description.Adult palm tanagers are 19 (cm) long and weigh 36 (g). They are grey to dull olive-green. The flight feathers are blackish, and the long tail is blackish edged with green. A.


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Römerberg. Römerberg is a municipality in the Rhein-Pfalz-Kreis, in Rhineland-Palatinate, Germany. It is situated on the left bank of the Rhine, approximately 5 (km) southwest of Speyer.## History.The municipality of Römerberg was established by the fusion of the municipalities of Berghausen, Heiligenstein and Mechtersheim in 1969. The seat of the municipality is in the village Heiligenstein.


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Old Orhei. Old Orhei () is a Moldovan historical and archaeological complex located in Trebujeni, which is approximately 60 (km) north-east of Chișinău on the Răut River in the Republic of Moldova.## History.The ancient city of Orheiul Vechi is a natural and historical complex, located in a narrow bend of the Răut River. The natural landscape of limestone rock, eroded by the river, is combined with archaeological vestiges of the ancient Trypillian civilization. As a result of archaeological excavations, cultural layers were discovered from different epochs, such as the Paleolithic, Eneolithic, and Iron Age.Old Orhei contains traces of different civilizations, including the.

Old Orhei. remnants of earthen and wooden fortresses of Geto–Dacian fortress (6th–1st centuries B.C.), the Golden Horde fort "Shehr al-Jedid (or Yangi-Shehr)" (14th century), a Moldavian fort dating from the 14th-16th centuries, an Orthodox monastery ( 14th century), and the Moldavian town of Orhei from the 14th–16th centuries.The Orthodox monastery is still inhabited by a handful of Orthodox monks, who maintain the church at the top of the hill. The caves are still functional as chapels. The caves contain an array of historical artifacts and Old Church Slavonic inscriptions dating from the 1690s, which testify that the Hajduk took shelter in the.