永磁交流伺服电机齿槽转矩抑制技术研究

Research on the Method of Reducing Motor Cogging Torque by Slotting and Skew Pole

永磁交流伺服电机的齿槽转矩会增大电机的转矩脉动,从而影响电机的可靠运行和整个控制系统的控制精度。为了减小电机的齿槽转矩,提高电机的控制精度,本文首先对齿槽转矩的产生机理进行了分析,提出了一种采用开槽加斜槽的方法来抑制电机的齿槽转矩。然后以10极12槽永磁交流伺服电机为研究对象,运用有限元法分析了定子常规结构、齿开槽结构、斜槽结构与齿开槽加斜槽结构的气隙磁密、气隙磁密谐波与齿槽转矩,证明了齿开槽加斜槽结构的齿槽转矩抑制效果最佳。并搭建了齿槽转矩测试平台,通过实验验证开槽加斜槽方法能够有效抑制电机的齿槽转矩,验证了有限元法分析的正确性。

Permanent magnet AC servo motor due to the presence of cogging torque will increase the torque ripple of the motor,thus affecting the reliable operation of the motor and the control accuracy of the whole control system.In order to reduce the cogging torque of the motor and improve the control accuracy of the motor,this paper first analyzed the generation mechanism of the cogging torque,and put forward two kinds of cogging torque suppression measures,namely,stator tooth slotted and sloped pole.Then,taking 10 poles and 12 slots permanent magnet AC servo motor as the research object,the finite element method was used to analyze the air-gap magnetic density,air-gap magnetic density harmonic and cogging torque of stator conventional structure,slotted structure,slotted structure and slotted and slotted structure.It was proved that the cogging torque suppression effect of slotted and slotted structure was the best.Finally,a prototype was made and a cogging torque test platform was built to verify the accuracy of the finite element method analysis.