基于极弧系数组合的永磁直线电机齿槽力削弱方法  

Method for reducing cogging force by optimization of the pole arc in permanent magnet linear motors

作　　者：全磊[1] 范承志[1] 叶云岳[1] 

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《机电工程》2011年第10期1209-1212,共4页Journal of Mechanical & Electrical Engineering

基　　金：国家自然科学基金资助项目(50607016);浙江省教育厅资助项目(20051025)

摘　　要：永磁电机由于齿槽效应造成的推力波动一直是影响其性能的一个重要因素。为了削弱永磁同步直线电机的齿槽转矩,结合直线电机的结构特点,利用能量法和傅立叶分解的解析分析方法,推导出了齿槽转矩与极弧系数的数学关系表达式。由于边端力也会造成直线电机的推力波动,而边端力与动子长度密切相关,提出了一种基于不同极弧系数组合的齿槽转矩削弱方法以避免动子长度变化过大。有限元仿真及实验结果表明,该方法可有效地减少齿槽力,提高永磁同步直线电机的运动性能。Force ripple caused by cogging force is one of the main reasons which prevent permanent magnet motors from acquiring high performance. Aiming at reducing cogging force in permanent magnet linear motors, taking into account of the structural features of linear motors, an analytical method based on energy method and Fourier series was proposed to obtain the expression of cogging force which was related with pole-arc. End force, which was closely related with the length change of the secondary rod, can also cause force ripple, a method based on different combinations of pole-arc for reducing cogging torque was proposed to avoid excessive length change of the secondary rod. Simulation and experiment results show that the method can be effective to reduce cogging force and improve the motion performance of the permanent magnet synchronous linear motors.

关 键 词：永磁直线电机 齿槽力 极弧系数 有限元 稳态磁场 

分 类 号：TH39[机械工程—机械制造及自动化] TM359.4[电气工程—电机]