永磁同步电机极槽组合优化的研究

齿槽转矩是影响永磁同步伺服电机低速平稳性的主要原因。本文先通过能量转换概念分析了永磁电机的转矩特性,进而分析和推导了齿槽转矩的解析表达式。针对4极12槽、15槽、18槽的不同极槽组合进行分析,从理论上得出4极15槽这种极槽组合可明显削弱齿槽转矩。在这种极槽组合的基础上,通过合理的绕组连接,可改变磁链中的谐波分量和幅值,有利于反电势波形更趋于正弦波。最后采用有限元对其进行仿真验证,证明上述提出的方法正确有效。

Research on Slot and Pole Count Combination of PMSM

The cogging torque is the main influence on stability of permanent magnet synchronous servo motor at low speed. This article first analyzed the torque characteristics of permanent magnet motor with the concept of energy conversion, then analysis and analytical expression of the cogging torque was deduced. When comparing the different pole/slot combinations of 4 pole 12/15/18 slot motor, theoretically concluded that 4 pole 15 slots can obviously reduce the cogging torque. On the basis of this pole/slot combination, through a reasonable winding connection, the harmonic component and amplitude of flux linkage can be changed, and the back EMF waveform is tend to be sinusoidal. Finally, the proposed method is proved to be effective while using the finite element simulation.