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Switched Reluctance Motors Ad Their Uses

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Submitted By sameerkr21
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In this term paper we look into switched reluctance motor and specially permanent magnet assisted switched reluctance motor.We study one particular implementation of a permanent magnet assisted switched reluctance machine.
Known generator adaptable for use in aircraft engines include flux switch generators, permanent magnet generators, lundell permanent magnet generators, wound rotor synchronous generators, Homopolar generators, hybrid homopolar generators, slave regulated generators and switched reluctance machines. Switched reluctance (SR) machines conventionally have multiple poles both stator and rotor; that is they are doubly salient. In switched reluctance machines, there is a concentrated winding on each of the stator poles, but no winding or magnets on the rotor. Each pair of diametrically opposed stator pole windings is connected in series or parallel to form an independent machine phase winding of the multiphase SR machine. Torque is produced by switching current in each machine phase winding in a predetermined sequence that is synchronized with angular position of the rotor, so that a magnetic force of attraction results between the rotor poles and stator poles. Current is switched off in each phase before the rotor poles rotate past the aligned position. The torque developed is independent of the direction of current flow, so that unidirectional current pulses synchronized with rotor movement can be applied to the stator pole winding by an inverter using unidirectional current switching elements, such as transistors or thyristors. For use as a generator, the current pulse in each machine phase winding are simply shifted so that current flows when the rotor poles are moving past alignment towards the unaligned position. A SR motor drive or generator system operated by switching the machine phase current on and off in synchronism with rotor position.

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