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DC and AC motors have differing means of speed control. While DC motors are controlled by varying the armature winding's current, AC motors simply vary the frequency. An induction motor and a synchronous motor are two types of AC motors. An induction motor uses a magnetic field on a rotor that is created by an induced current. A synchronous motor is powered by a current through slip rings or a permanent magnet. Synchronous motors usually run much faster than induction motors because of the presence of slip rings. DC electric motor repair is much more expensive than AC electric motor repair. Paper producing machines and steel mill rolling machines are a few examples of a DC electric motor.
Explanation of synchronous motors. A synchronous motor has a special rotor construction that lets it rotate at the same speed â that is, in synchronization â with the stator field. One example of a synchronous motor is the stepping motor, widely used in applications that involve position control. However, recent advances in power-control circuitry have given rise to synchronous-motor designs optimized for use in such higher power situations as fans, blowers, and to drive axles in off-road vehicles.