![]() ![]() The insulation of thicker square or rectangular magnet wire is often augmented by wrapping it with a high-temperature polyimide or fiberglass tape, and completed windings are often vacuum impregnated with an insulating varnish to improve insulation strength and long-term reliability of the winding. Polyimide insulated magnet wire is capable of operation at up to 250 ☌ (482 ☏). Magnet wire insulating films use (in order of increasing temperature range) polyvinyl formal (Formvar), polyurethane, polyamide, polyester, polyester- polyimide, polyamide-polyimide (or amide-imide), and polyimide. Modern magnet wire typically uses one to four layers (in the case of quad-film type wire) of polymer film insulation, often of two different compositions, to provide a tough, continuous insulating layer. Because of its lower electrical conductivity, aluminium wire requires a 1.6-times larger cross sectional area than a copper wire to achieve comparable DC resistance.Īlthough described as "enameled", enameled wire is not, in fact, coated with a layer of enamel paint or vitreous enamel made of fused glass powder. High-purity oxygen-free copper grades are used for high-temperature applications in reducing atmospheres or in motors or generators cooled by hydrogen gas.Īluminium magnet wire is sometimes used as an alternative for large transformers and motors, mainly for economical reasons. Most often, magnet wire is composed of fully annealed, electrolytically refined copper to allow closer winding when making electromagnetic coils. When factors such as chemical, physical, and mechanical property requirements are considered, copper is considered the first choice conductor for magnet wire. The most suitable materials for magnet wire applications are unalloyed pure metals, particularly copper. The insulation is typically made of tough polymer film materials rather than vitreous enamel, as the name might suggest. ![]() Aluminium magnet wire is sometimes used for large transformers and motors. The wire itself is most often fully annealed, electrolytically refined copper. Speakers, hard disk head actuators, electromagnets, electric guitar pickups and other applications that require tight coils of insulated wire. It is used in the construction of transformers, inductors, motors, generators, Magnet wire or enameled wire is a copper (Cu) or aluminium (Al) wire coated with a very thin layer of insulation. ![]() Inductor made with magnet wire wound around a toroidal core ![]()
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