田口方法在永磁同步电机结构优化中的应用

Application of Taguchi Method in Structure Optimization of Permanent Magnet Synchronous Motor

针对永磁电机传统局部优化方法不能实现多目标优化的问题,提出了一种基于田口方法的优化方法。通过运用田口方法对分数槽集中绕组永磁同步电动机的气隙长度、极弧系数、永磁体厚度、定子齿宽和槽口宽度进行优化,使电机效率、齿槽转矩、单位质量永磁体产生转矩等性能最佳。利用田口正交实验建立正交矩阵,并结合统计学,分析各优化变量对优化目标的影响,最终得出多优化因子的最佳组合。利用有限元法对优化后的电机进行二维瞬态场分析,得到电机在负载条件下磁场分布以及相关特性。实验数据及相关分析表明,田口方法适用于分数槽集中绕组永磁同步电机的优化设计,并且能有效地抑制电机的齿槽转矩。

Aiming at the issue of the traditional local optimization method of permanent magnet motor can not achieve multi-objective optimization,an optimization method based on Taguchi method is proposed.By using Taguchi method,air gap length,pole arc coefficient,permanent magnet thickness,stator tooth width and slot width of the fractional-slot concentrated winding permanent magnet synchronous motor are optimized,which makes performances including efficiency,cogging torque,torque produced by unit mass permanent magnet of the motor optimum.The orthogonal matrix is established according to the Taguchi orthogonal experiment.Combining with statistics,the influences of each optimization variable on the optimization objective are analyzed,and the optimal combination of multiple optimization factors are obtained at finally.Two-dimensional transient field of the optimized motor is analyzed by using the finite element method,the magnetic field distribution and relevant characteristics of the motor under load conditions are obtained.Experimental data and related analysis show that the Taguchi method is suitable for the optimal design of fractional-slot concentrated winding permanent magnet synchronous motor,and can effectively suppress the cogging torque of the motor.