开关磁阻电机转矩脉动优化研究

Torque ripple optimization for a switched reluctance motor

转矩脉动是造成电机振动和噪声的主要原因。为降低开关磁阻电机转矩脉动,研究了一种新型转子齿形,即在传统平行转子齿形的两侧添加半椭圆形辅助铁芯。利用有限元法,对一台12/8极开关磁阻电机建模,通过参数化仿真,得到最优改进模型。同时,为了进一步降低转矩脉动,优化功率变换器开关角,缓解换相时引起的转矩跃变。通过仿真计算得到最佳开通角和关断角组合方案,不仅可以显著降低开关磁阻电机的转矩脉动,而且还缓解了双凸极造成的局部饱和。该方法从根源上减小双凸极结构造成的局部饱和和换相时引起的转矩较大跃变,对于其它的双凸极电机都有借鉴意义。

Torque ripple is the main source to cause motor vibration and noise. Here, in order to reduce torque ripple of a switched reluctance motor, a new type rotor tooth profile, i.e., a semi-oval auxiliary core being added on both sides of a traditional parallel rotor tooth profile, was studied. The finite element method was used to model a 12/8-pole switched reluctance motor, and the optimal modified model was obtained through parameterized simulation. Meanwhile, to further reduce torque ripple, the switching angle of the power converter was optimized, and the torque transition caused by phase change was relieved. The combination scheme for the optimal switch-on and switch-off angles was obtained through simulation calculation. The results showed that the proposed method can not only significantly reduce torque ripple of a switched reluctance motor, but also relieve the local saturation caused by double salient-pole;the proposed method can be used as a reference for other double salient-pole motors.