转子磁极分段移位斜极对永磁同步电机转矩的影响

为了降低齿槽转矩和转矩脉动对电机性能的影响,采用电机转子磁极分段移位斜极方法达到减振降噪、提高永磁同步电机性能的目的.基于此方法对电机的齿槽转矩进行理论计算,并利用有限元法在Maxwell中建立8极48槽内置式永磁同步电机模型,分析转子磁极分段移位斜极方法对齿槽转矩和转矩脉动的影响.研究结果表明:齿槽转矩中除了次数为转子磁极分段数及其倍数次的谐波外,其余谐波基本得到消除,并且随着转子磁极分段增加,齿槽转矩峰值逐渐降低,尤其在磁极分三段时,齿槽转矩峰值下降5.22 N·m,对齿槽转矩的削弱效果最为明显;负载转矩和转矩脉动随着转子磁极分段数的增加逐渐降低,转子磁极分两段时降低幅度较为明显,与转子磁极不分段相比下降60%,并且随着转子磁极分段数增加,转矩脉动趋于平稳.

Effect of Segmented Shift of Rotor Magnetic Pole on Torque of Permanent Magnet Synchronous Motor

In order to reduce the influence of cogging torque and torque ripple on the performance of the motor and improve the performance of the permanent magnet synchronous motor, a method of segmented shifting of the rotor magnetic pole of the motor was used to reduce vibration and noise. The cogging torque of the motor was calculated theoretically, and an 8-pole 48-slot interior permanent magnet synchronous motor model was established in Maxwell by using the finite element method. The influence of the rotor magnetic pole segmented shift skew method on the cogging torque and torque ripple was analyzed. The results show that the harmonics of the cogging torque are basically eliminated except for the harmonics with the number of rotor magnetic pole segments and their multiples, and the peak value of the cogging torque tends to decrease gradually with the increase of the rotor magnetic pole segments. Especially when the magnetic pole is divided into three segments, the peak value of the cogging torque decreases by 5.22 N·m, and the weakening effect on the cogging torque is most obvious. The load torque and torque ripple tend to decrease gradually with the increase of the number of rotor pole segments. The decrease is more obvious when the rotor pole is divided into two segments, which is 60% lower than that of the rotor pole without segmentation, and the torque ripple tends to be stable with the increase of the number of rotor pole segments.tends to be stable with the increase of the number of rotor pole segments.