基于正交试验的永磁有刷直流 微电机齿槽转矩波动的稳健设计

针对齿槽转矩波动影响电机控制精度的问题,提出了基于正交试验的永磁直流微电机齿槽转矩稳健设计方法.以永磁有刷直流微电机为对象,建立基于有限元软件ANSYS的电机二维静态磁场分析模型.将电机齿槽转矩波动幅度作为望小特性,考虑齿楔角误差、气隙长度偏差、计算矫顽力偏差的噪声因素影响下,综合优化齿宽、齿楔角、槽底半径、永磁体中心角和永磁体计算矫顽力.将优化结果与原始设计方案作对比分析,结果表明:与原始设计方案相比,稳健设计后的齿槽转矩波动幅度的信噪比提高了43.5%,因此,电机齿槽转矩的波动幅值对外界干扰的影响更加稳健.

Robust design for the cogging torque fluctuation of permanent magnet brush DC micro motor based on orthogonal experiment

According to the problem of motor control precision caused by the cogging torque fluctuation, a robust design method of permanent magnet DC micro motor cogging torque, which based on orthogonal experiment, was presented. For permanent magnet brush DC micro motor, a 2D static magnetic field model of micro motor was established based on finite element software ANSYS. Taking noise factor such as tooth wedge angle error, and air gap length error, and calculated coercivity deviation into account, tooth width, tooth wedge angle, radius of slot bottom, permanent magnet center angle and calculation coercivity of permanent magnet were optimized synthetically in the condition of cogging torque fluctuation as smaller the better characteristic. Optimization result was analyzed by comparing to original scheme, the result show that noise signal ratio of fluctuation amplitude of cogging torque increase by 43.5% for robust design. Therefore, fluctuation amplitude of cogging torque has a better robust for external disturbance.