Enameled wire & magnet wire
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copper enameled wire for motor winding

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enameled copper wire

copper wire with a coating of enamel to insulate it. It's intended to be used in coils and transformers where the wire is wound with the turns in physical contact with each other. the enamel prevents the turns from shorting to each other. Enameled wire is normally used for motors and other things with coils of wire because the layer of enamel on it is a lot thiner than the thinest layer of plastic you can put on a wire. This means you can get a lot more turns of wire into a given space and so your motors are smaller and work better.

Motor Wire Applications

Electric motors are used in applications such as fans, blowers, pumps, machines, household appliances, power tools, and disk drives. Large electric motors can be used in equipment that powers the propulsion systems of large ships. The smallest motors will be used in applications such as electric wristwatches.

Motor Wire Specifications

Motor wire will almost always be made of either copper or aluminum. Wires that are made from metals that are better electrical conductors will run more efficiently than metals that are don’t conduct electricity as well. Poor electrical conductors will create wasted heat. Aluminum has lower overall conductivity than copper does, requiring a cross-section that is 66% larger than a copper wire would need in order to achieve equal ratings. Copper is the highest conducting non-precious metal. Due to its high electrical conductivity, copper is commonly used in motor coil windings, bearings, collectors, brushes, and connectors.

Insulation

Motor wire insulations are going to be out of a polyester or fiberglass yarn or a thin enamel. Wires that have thicker insulations can come with a high-temperature tape made out of a polyimide or fiberglass material. The coils are also coated with a varnish that adds extra insulation and improves the wire’s strength and reliability. The turns of bare wires have no protection from insulation, so the wire turns would not be able to not touch each other. Insulated wire can be wound so that the wires do touch, since the insulation will protect the wire from shorting itself out. Wires often need hundreds, or even thousands, of turns, meaning the wire will require protection from insulation. The diameter, measured in both millimeters or inches, along with the thermal capacity and AWG wire sizes, will be based on the type of insulation used.

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