基于转子磁链优化的五相感应电机电子变极策略

Electronic Pole-Changing Strategy for Five-Phase Induction Motor Based on Rotor Flux Optimization

针对五相感应电机(FIM)指数响应转矩跟踪电子变极运行不平稳问题,分析得出转子磁链饱和是导致该问题的主要原因之一,计及磁链饱和提出一种转子磁链优化(RFO)电子变极控制策略。分析了FIM电子变极过程中两个控制平面转子磁链叠加是导致磁链饱和的原因,设计了转子磁链控制函数,并采用磁链幅值和电磁转矩约束函数使转子磁链逼近临界值,优化了转子磁链控制。基于FIM的Speedgoat半实物实验平台,对所提RFO方法进行了实验验证,对采用和未采用RFO的指数响应转矩跟踪电子变极控制策略进行对比实验研究。实验结果表明,所提策略使转速波动减小了50%,转矩波动减小了67%,有效改善了电子变极过程中电机运行平稳性。

The electronic pole-changing with exponential response torque tracking of five-phase induction motor(FIM)suffers from the problem of unsmooth operation.The analysis shows that that the rotor flux saturation is one of the main reasons.Therefore,a rotor flux optimization(RFO)electronic pole-changing control strategy is proposed considering the flux saturation.The superposition of the rotor flux of two control planes during the process of electronic pole-changing is the cause of flux saturation.The control function of the rotor flux is thus designed by the constraint functions of flux amplitude and electromagnetic torque to make the rotor flux approach the critical value,which optimizes the rotor flux control.Based on the Speedgoat hardware in the loop experimental platform of FIM,the proposed RFO method is verified through an experiment,and the electronic pole-changing control strategies of exponential response torque tracking with and without RFO are compared.The experimental results show that the proposed strategy reduces the speed fluctuation by 50%and the torque fluctuation by 67%,which effectively improves the smoothness of the motor during electronic pole-changing process.