基于单极性PWM的开关磁阻电机转矩控制策略

Torque Control Strategy of Switched Reluctance Motor Based on Unipolar PWM

开关磁阻电机(SRM)转矩脉动过大的特性,一直是该型电机发展进程中重点研究的问题。为抑制SRM转矩脉动,提高系统转矩控制能力,对SRM的直接瞬时转矩控制(DITC)策略进行了研究与改进。以滞环DITC为基础,通过结合PWM的调制特性,提出了单极性PWM-DITC策略。系统仿真结果表明,单极性PWM-DITC策略相较于滞环DITC策略,可有效地抑制换相区转矩脉动,提高SRM调速控制系统的转矩控制性能。

The characteristics of excessive torque ripple of switched reluctance motor(SRM)has been the focus of research and solution in the development process of this type of motor.In order to suppress the torque ripple of switched reluctance motor and improve the torque control capability of the system,the direct instantaneous torque control(DITC)strategy of SRM is studied and improved in this paper.Based on the hysteresis DITC strategy and combined with the modulation characteristics of PWM,a unipolar PWM-DITC strategy is proposed.The simulation results show that compared with the hysteresis DITC strategy,the unipolar PWM-DITC strategy can effectively suppress the torque pulsation in the commutation region,and improve the torque control performance of the SRM drive system.