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Chapter 3: AC and DC Motors - AC Motors: Eddy Current Generation

By Dave Polka
From Motors and Drives

Eddy Current Generation
The rotating stator magnetic field and induced voltage in the rotor bars also causes voltage in the stator and rotor cores. The voltage in these cores cause small circulating currents to flow. These currents, called eddy currents, serve no useful purpose and result only in wasted power. To reduce these currents, the stator and rotor cores are constructed with laminations. (discussed in the previous section). These laminations are coated with insulating varnish and then welded together to form the core. This type of core substantially reduces eddy current losses, but it does not eliminate them entirely.

© 2003 ISA
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AC motors include single, multiphase, universal, induction, synchronous, and gear motors. They also include servomotors.   Search by Specification | Learn more about AC Motors
Gearmotors consist of an AC or DC motor with an integral gearbox or gear head that steps delivered speed up or down. Search by Specification | Learn more about Gearmotors
Linear motors generate force only in the direction of travel. They are capable of extremely high speeds, quick acceleration, and accurate positioning. Search by Specification | Learn more about Linear Motors
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