Reluctance Synchronous Machines and Drives Monographs in Electrical and Electronic Engineering
Advanced Motor Technologies: Reluctance Motors
There are two large families of reluctance motor with distinct constructional and operational features: synchronous reluctance motors and switched reluctance motors. Synchronous reluctance motors employ a virtually standard polyphase stator having a relatively large number of teeth, slots and overlapping coils. As in polyphase synchronous motors proper i. However, in contrast with these more common motors whose torque can be ascribed to B. Unable to display preview. Download preview PDF.
A synchronous electric motor is an AC motor in which, at steady state ,  the rotation of the shaft is synchronized with the frequency of the supply current ; the rotation period is exactly equal to an integral number of AC cycles. Synchronous motors contain multiphase AC electromagnets on the stator of the motor that create a magnetic field which rotates in time with the oscillations of the line current. The rotor with permanent magnets or electromagnets turns in step with the stator field at the same rate and as a result, provides the second synchronized rotating magnet field of any AC motor. A synchronous motor is termed doubly fed if it is supplied with independently excited multiphase AC electromagnets on both the rotor and stator. The synchronous motor and induction motor are the most widely used types of AC motor.