Milad Dowlatshahi - Electrical and Computer Engineering Department, Isfahan University of Technology(IUT), Isfahan, Iran
Seyed Morteza Saghaeian Nejad
Jin-Who Ahn - Department of Mechatronics Engineering, Kyungsung University, Busan, Korea

Torque pulsation mechanism and highly nonlinear magnetic characterization of switched reluctance motors(SRM) lead to unfavourable torque ripple and limit the variety ofapplications in industry. In this paper, a modification method proposed for torque control of SRM based on conventionaltorque sharing functions(TSF) to improve maximum speed of torque ripple-free operation considering converter voltage limitation. Due to increasing phase inductance in outgoing phase during the commutation region, reference current tracking can be deteriorated especially when the speedincreased. Moreover, phase torque production in incoming phase may not be reached to the reference value near the turnon angle in which the incremental inductance would bedramatically decreased. Torque error for outgoing phase can cause increasing the resultant motor torque while it would benegative for incoming phase and yields reducing the motor torque. In the proposed modification method, phase torque tracking error for each phase under the commutation added tothe other phase so that the resultant torque remained in constant level. This yields to enhance motor efficiencycompared than the conventional receding turn-on and turn-off angles. An experimental four phase 1.6 KW, 8/6 SRM set ofmagnetic characterization data used to simulate and validate the effectiveness of the proposed method

Torque control, switched reluctance motor, torque sharing function, high speed operation