The researcher could use the ansys software to design and analyze the motors who did n ' t know the ansys software very well by the special purpose software packets . the influence of a centralization winding brushless dc motor structural design parameter and magnetic field were analyzed , and a way to achieve the fix position angular force was brought out 利用上述軟件研討無刷直流電機的定位轉矩的求取方法;分析集中式繞組的無刷直流電機各結構設計參數對磁場的影響,嘗試求取、分析空載漏磁系數,討論如何削弱定位轉矩。