削弱模块化永磁电机齿槽转矩的新方法

A Novel Method of Weakening the Cogging Torque of Modular Permanent Magnet Motor

为减小模块化永磁电机的齿槽转矩,结合永磁电机槽口偏移法,提出并讨论了一种新型定子结构,沿圆周方向带有向左和向右的槽开口。由于定子槽开口的机械位移,产生的齿槽转矩分量也移向右侧和左侧。因此,对于一个适当的移动角,齿槽转矩分量的一半和另一半可以移动180°,这使得齿槽转矩分量相互抵消,从而削弱了总的合成齿槽转矩。通过将一个电机的总齿槽转矩看作是由两个电机齿槽转矩叠加而成的方法,使得分析方法更加简单易懂,并给出了槽口偏移的表达式。实验仿真表明,该方法能够有效削弱模块化永磁电机的齿槽转矩,并将转矩波动控制在额定转矩的2%以下。

A new structure of stator combing the slot opening shift of the permanent magnet motor is discussed in the paper in order to reduce the cogging torque of modular permanent magnet motor. The generated cogging torque components are shifted also to the right and to the left due to the mechanical displacement of stator slot opening. Therefore, for an appropriate shifting angle, the cogging torque components for the one-half and the second half can be shifted by 180°, and the cogging torque components can be mutually offset, then the total cogging torque can be reduced. By the method of regarding the total cogging torque of one motor as the addictive cogging torque of two motors, the expression of slot opening shift has been given. The experimental simulation shows that the method can effectively weaken the cogging torque of modular permanent magnet motor, and can keep the torque ripple under the 2% of the rated torque.