【摘要】 为提高开关磁阻电机运行性能,降低转矩脉动,分析了在单极性正弦电流激励下的电机状态。在单极性正弦激励条件下,电机转矩方程分为两部分:前者为平均转矩分量,后者是转矩脉动量。为减小转矩脉动,提出一种在直流偏置电流中注入3次谐波电流的方法。通过分析电机铜耗,得到选择合适的电流比能够使得单位转矩下铜耗最小的结论,并给出了具体比值。实验表明,该方法能够有效控制绕组电流,实现了单极性的交流电流控制;3次谐波注入后能够减少转矩脉动。该控制方法简单、易于实现,且能有效抑制转矩脉动,在中低速低成本应用场合有一定应用前景。更多还原

【Abstract】 In order to improve the operation performance and decrease the torque ripple of switched reluctance motor(SRM),the state of the motor excited by unipolar sinusoidal current was analyzed. The torque equation is divided into two parts under sinusoidal excitation,the former is the average torque component,and the latter is the torque ripple component. In order to reduce torque ripple,a method of injecting third harmonic current into DC bias current was proposed. By analyzing the copper loss,the conclusion that selecting the appropriate current ratio can minimize the copper loss under unit torque was obtained,and the specific ratio was given. Experiments show that this method can effectively control winding current and achieve unipolar AC current control. Third harmonic injection can reduce torque ripple. This control method is simple,easy to implement,and can effectively inhibit torque ripple. It has a certain application prospect in low speed and low cost applications.更多还原