Patent ID: 6252325
Filing Date: 2001-06-26
Classification: H02K

Abstract:
A switched reluctance motors comprising:(a) a rotor;(b) a stator surrounding said rotor, said stator having a plurality of stator salient poles arranged at a substantially uniform pitch along an inner circumference of said stator;(c) an excitation winding mounted around each of said stator salient poles;(d) a torque winding mounted around each of said stator salient poles; and(e) an exciting circuit for flowing a direct current to said excitation windings, which are associated with said stator salient poles, wherein excitation windings are connected to each other in series;said stator salient poles each have a width in a direction of rotation of said rotor;said stator has a plurality of stator recesses sandwiched one between each adjacent pair of said stator salient poles;said rotor has a plurality of rotor salient poles arranged round said rotor and having a width larger than said width of said stator salient poles and a plurality of rotor recesses sandwiched one between each adjacent pair of said rotor salient poles and having a width larger than said width of said stator salient poles; and which further comprisesa current control circuit for controlling, during strenuous operation, a torque current in said torque winding on each said stator salient pole in such a manner that said torque current is increased from zero to a torque current value IP1 corresponding to a torque command value TCM while each said stator salient pole is located within said width of each said rotor recess until reaching an associated one of said stator salient poles, that a rotational torque is generated while each said rotor salient pole reaches each said stator salient pole surrounded by the corresponding torque winding and that said torque current is decreased from IP1 to zero while each said stator salient pole is located within said width of each said rotor salient pole, and also for controlling during regenerative operation, said torque current in said stator winding on each said stator salient pole in such a manner that said torque current is decreased from zero to a torque current value IP1 corresponding to a torque command value TCM while each stator salient pole is located within said width of said associated rotor salient pole, that a rotational torque is generated while each said rotor salient pole is moved away from each said stator salient pole surrounded by the corresponding torque windings and that said torque current is decreased from said torque current value IP1 to zero while each said stator salient pole is located within said width of each said rotor recess as each said rotor salient pole is moved away from said associated stator salient pole.