Determination of optimum switching angles for （确定最优切换角）.pdfVIP

Indian Journal of Engineering Materials Sciences Vol. 11, June 2004, pp. 151-168 Determination of optimum switching angles for speed control of switched reluctance motor drive system a a b b Hamid Ehsan Akhter , Virendra K Sharma , A Chandra Kamal Al Haddad aDepartment of Electrical Engineering, Jamia Millia Islamia, New Delhi 110 025, India bDepartment de Genie Electrique, Ecole du technologie superiere, 1100 rue Notre Dame (Ouest), Montreal (Quebec), H3C 1K3, Canada Received 29 April 2003; accepted 11 March 2004 Turn-on angle and turn-off angle are the two switching angles that play a major role in deciding whether a switched re- luctance motor (SRM) develops positive or negative, high or low electromagnetic torque. Switching angles are function of speed and change with acceleration, but this requires sophisticated and complex digital controllers for real time variation of switching angles as a function of rotor speed. This paper presents a methodology on the determination of fixed turn-on and turn-off angles that are optimum and provide satisfactory performance of the SRM drive during full-load operation. Ex- perimental magnetization and static torque data are used for realistic simulation of dynamic response of a 4 kW, 4-phase, 8- pole stator, and 6-pole rotor configuration SR motor. The simulated performance of SRM drive system is presented to ana- lyze the effect of different switching angles on full-load (25 Nm) starting performance of the drive in terms of speed, cur- rent and torque response. An optimum pair of turn-on a