宽转子无轴承开关磁阻电机的转子极形优化

为了解决宽转子无轴承开关磁阻电机由于开关型供电方式以及双凸极铁心结构在运行过程中容易导致转矩脉动很大的问题，本文对其转子极结构进行改进，提出在转子极两侧开槽的优化设计方案。旨在通过增大开槽处的气隙磁阻，提高用于产生转矩的切向分量的气隙磁密，从而降低转矩脉动。对所开槽进行参数化处理，使用控制变量法分析各开槽参数对转矩性能的影响，以性能指标最优为目标确定开槽参数。利用场路耦合的方法将电机有限元分析模型和直接瞬时转矩控制电路模型结合起来，实现电机系统的动态运行。仿真结果表明转子极开槽后能够有效降低宽转子无轴承开关磁阻电机的转矩脉动，提升平均转矩，并且对径向悬浮力的影响很小。

Optimization of Rotor Pole Shape for Bearingless Switched Reluctance Motor with Wide Rotor

In order to solve the problem of wide rotor bearingless switched reluctance motors are prone to large torque ripple during operation due to the switching power supply method and double salient iron core structure, the rotor structure of a bearingless switched reluctance motor with wide rotor is improved by slotting on both sides of the rotor. By increasing the air gap magnetic resistance near the slots, the tangential air gap magnetic density used to generate torque can be increased, so that the torque ripple can be reduced. After the slots are parameterized, the control variates method is used to analyze the impact of slotting parameters on torque performance, and the slotting parameters are finally determined with the goal of optimizing performance indicators. By using the method of field circuit coupling, the finite element analysis model of the motor and the direct instantaneous torque control circuit model are combined to achieve the dynamic operation of the motor system. The simulation results show that slotting on the rotor can effectively reduce the torque ripple of the bearingless switched reluctance motor with wide rotor, and improve the average torque, while has little impact on radial suspension force.