PWM-based instantaneous current profile tracknig control for torque ripple suppression in switched reluctance servomotors

Abstract

This paper proposes instantaneous current profile tracking control for minimizing torque ripple of switched reluctance motors. Because of its unique principle of torque generation different from conventional AC motors, instantaneous current profiling control is essential to regulate the torque with ripple minimized. In addition, since its conventional motor model in order to determine an adequate applied voltage reference is established not yet, a hysteresis current regulator is generally employed, in which it is rather difficult to design switching frequency of converter. In the proposed scheme, the controller can calculate the adequate applied voltage reference which can determined based on the voltage equation derived from non-linear magnetizing curve model. The applied voltage reference is realized under conventional subharmonic PWM with a carrier frequency of 12 KHz and fixed DC-voltage of 283V. The experimental results using 400W test motor with 8/6 poles configuration verify that the measured instantaneous current profiles well follow the reference profiles.