Anodised Aluminium Strips and Foils
Manufacturing of anodised aluminium is based on the finishing process of anodic oxidation. Anodising aluminium results in a coating layer of aluminium oxide that firmly adheres to the metal surface and forms a nearly homogenous bond with the aluminium. The result: A material with a high-grade and resistant surface that prevents electricity from leaking to the outside, thus ensuring secure and safe electrical insulation.
The unique characteristics of anodised aluminium, make anodised aluminium strips particularly attractive to be used in all segments of the electro technical industry. Furthermore, anodised aluminium strips offer several advantages against conventional enameled copper wires.
Weight reduction: Windings made of anodised aluminium weigh only half as much as windings made of lacquered copper wire, maintaining the same electric properties within a similar size.
No need for interlayer insulation material: The oxide layer, which grows on all 4 sides of the aluminium strip, has a maximum thickness of 6 µm. It´s breakdown voltage is >10 V/µm, which results in a breakdown voltage of 120 V between turns. In case your application does not require this, the oxide layer can be reduced down to 3 - 4 µm or 4 - 5 µm, generating a cost optimisation.
Filling factor: With anodised aluminium strips it is possible to obtain a filling factor up to 99,5 %. In comparison the typical filling factor obtained with lacquered copper wire ranges at 52 %.
"Higher filling factor = Higher efficiency of the electric component".
Compact construction: The absence of extra insulation materials results in an available space that can be taken advantage of by increasing the cross section of the aluminium strips. Consequently, the space needed by a anodised aluminium coil would be similar to the space needed by a lacquered copper wire coil, bringing new solutions in the constructions of coils for you.
See also ANOFOL Coils
Resistant to higher temperatures: While a copper winding resists up to 180 °C maximum, a coil made with anodised aluminium strip would resist up to approximately 500 °C.
Superior heat dissipation: In a typical coil wound of lacquered copper wire, the dissipation of heat from the center of the coil is significantly obstructed. The poor thermal conductivity of the insulation material in conjunction with air inclusions may result in heat build-up that may ultimately destroy the coil. In coils made of anodised aluminum strip heat can dissipate much faster from the center of the winding, since every turn is itself part of the heat-emitting exterior surface.