Operating Principle
The SRM has wound field coils as in a DC motor for the stator windings. The rotor however has no magnets or coils attached. It is made of soft magnetic material (laminated-steel protuberances). When power is delivered to the stator windings, the rotor's magnetic reluctance creates a force that attempts to align the rotor with the powered windings. In order to maintain rotation, adjacent windings are powered up in turn. As the stator does not turn, the switching of power from winding to winding may be difficult to arrange in a fashion that is properly timed to the movement of the rotor - brushes could be used, but this would eliminate most of the advantages of the design. Instead, in modern designs a high-power electronic switching system is used, which also offers advantages in terms of control and power shaping.
Read more about this topic: Switched Reluctance Motor
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