Induction Motor

An alternating current motor in which the primary winding on one member, usually the stator, is connected to the power source and a secondary winding or a squirrel-cage secondary winding on the other member, usually the rotor, carries the induced current. There is no physical electrical connection to the secondary winding, its current is induced.

A simple, rugged, ac motor with desirable characteristics. Induction motors are used more than any other type

Electrical Generation

An induction machine either squirrel cage type or wound rotor type is forcibly driven above its synchronous speed at which point it acts as a generator of electrical power into whatever electric system it happens to be connected. The electric system to which the motor is connected supplies the necessary excitation current to the induction machine.


The difference between the speed of the rotating magnetic field and the rotor in a non-synchronous induction motor. This is expressed as a percentage of synchronous speed. Slip generally increases with an increase in torque.

See also: AC Induction Motors, Electric Motors.

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Subjects: Electrical Engineering