Optimized Design of Cogging Torque with Polar-arc Coefficient and Permanent Magnet Edge Shaping
The cogging torque of permanent magnet motor has a large impact on the dynamic performance of permanent magnet motors,and weakening the cogging torque is one of the key points in the design of permanent magnet motor.In this paper,the analytical solution of the cogging torque was derived by using the complex permeability method combined with Maxwell's tensor equation,besides,the motor polar-arc coefficients and permanent magnet edge shaping were optimized based on the analytical method and the genetic algorithm,while the air-gap flux density of the motor was not reduced in the optimization process.The results were verified by the finite element software Maxwell,which showed that the accuracy of the obtained optimal polar-arc coefficient was within 3%,and the optimized permanent magnet edge shaping reduces motor cogging torque amplitude by up to 48%.The optimization method used in this paper does not require long solving time and has high optimization accuracy,the cogging torque amplitude can be effectively reduced by optimizing the polar-arc coefficients and permanent magnet edge shaping,which provides certain engineering implications for cogging torque weakening and dynamic performance optimization of motors.
万方数据
维普
