转子结构优化的内置V型永磁电机齿槽转矩研究

Rotor Structure Optimization of the Built-In V-Type Permanent Magnet Motor Cogging Torque Study

为了降低内置V型永磁电机的齿槽转矩,提出在提高齿槽转矩对称性的基础上结合改进非均匀气隙的方法降低齿槽转矩。首先,研究齿槽转矩对称性产生原理,通过优化转子参数Rib和HRib使对称系数由40%提高到93.3%,但齿槽转矩峰值也由1.30 N·m增加到1.54 N·m;在提高对称性的基础上,对传统非均匀气隙进行改进,齿槽转矩峰值可大幅降低。通过仿真分析得到,仅提高齿槽转矩对称性,传统非均匀气隙齿槽转矩峰值由1.54 N·m降低到1.05 N·m,仅仅降低了31.8%,改进非均匀气隙后齿槽转矩峰值降低到0.25 N·m,降低了86%,说明改进非均匀气隙能更好的结合对称性降低齿槽转矩;最后分析优化后空载气隙磁密和空载反电势谐波畸变率基本保持不变,说明优化后不会恶化电机其他性能。

In order to reduce the cogging torque of the built-in V-type permanent magnet motor,it is proposed to reduce the cogging torque by combining the method of improving the non-uniform air gap on the basis of improving the symmetry of the cogging torque.Firstly,the symmetry generation principle of cogging torque is studied,and the symmetry coefficient is increased from 40%to 93.3%by optimizing the rotor parameters Rib and HRib,but the peak cogging torque is also increased from 1.30 N·m to 1.54 N·m;on the basis of improving symmetry,the traditional non-uniform air gap is improved,and the peak of cogging torque can be greatly reduced.Through simulation analysis,only the symmetry of the cogging torque is improved,and the peak torque of the traditional non-uniform air gap cogging is reduced from 1.54 N·m to 1.05 N·m,which is only reduced by 31.8%,and the peak of the cogging torque after improving the non-uniform air gap is reduced to 0.25 N·m,which is reduced by 86%,indicating that the improvement of non-uniform air gap can better combine symmetry to reduce the cogging torque.Finally,after the optimization,the no-load air gap magnetic density and the no-load back potential harmonic distortion rate remain basically unchanged,indicating that the optimization will not worsen the other performance of the motor.