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浙江大学学报(工学版)
J4  2010, Vol. 44 Issue (8): 1548-1552    DOI: 10.3785/j.issn.1008-973X.2010.08.020
    
Method for reducing cogging torque based on magnet skewing in
disctype permanent magnet motors
ZHOU Jun-jie, FAN Cheng-zhi, YE Yun-yue, LU Qin-fen
College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
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Abstract  

An analytical method based on electromagnetic energy and Fourier series expansion was proposed, the mathematical model expression of cogging torque was deduced for PM poles skewing and normal motors, and the different effect of overallskewing and steppedskewing on cogging torque was discussed. Based on these expressions, a novel method was found for reducing cogging torque by suitable selection of polearc coefficient, the number of poles modules and their radial sizes. The validity of the proposed method was verified by 3D finite element analysis. This method was used on disctype permanent magnet motor for novel pumping unit. The experiment result shows that steppedskewing PM poles method is suitable for cogging torque reduction．

Published: 21 September 2010
CLC:  TM 351  
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Cite this article:

ZHOU Dun-Jie, FAN Cheng-Zhi, XIE Yun-Yue, LEI Qin-Fen. Method for reducing cogging torque based on magnet skewing in
disctype permanent magnet motors. J4, 2010, 44(8): 1548-1552.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2010.08.020     OR     http://www.zjujournals.com/eng/Y2010/V44/I8/1548


基于斜磁极的盘式永磁电机齿槽转矩削弱方法

为了确定桥梁交通振动试验中行走车辆的物理参数,提出基于遗传算法的参数识别方法.利用小波变换方法由车辆自由衰减振动响应获得车辆的模态参数,进一步应用遗传算法及复数特征值计算由模态参数反算车辆的转动惯量、刚度以及阻尼等物理参数.通过3组模拟数据的计算分析,验证了遗传算法用于车辆参数识别的有效性.以实际车辆的振动试验结果为例,检验了遗传算法在车辆参数识别中的可行性.算例及应用实例表明：应用遗传算法能精确识别出车辆的物理参数.

［1］ 胡建辉,邹继斌,陈霞.无刷直流电机的理想与非理想定位力矩及其综合抑制方法［J］.中国电机工程学报,2005,25(22):153157．
HU Jianhui, ZOU Jibin, CHEN Xia. The ideal and nonideal cogging torque in brushless DC motor and its comprehensive reducing methods［J］.Proceedings of the CSEE,2005,25(22): 153157．
［2］ HWANG S M, EOM J B, HWANG G B, et al. Cogging torque and acoustic noise reduction in permanent magnet motors by teeth pairing ［J］. IEEE Transactions on Magnetics,2000,36(5): 31443146．
［3］ THOMAS M J, WEN L S. Pulsating torque minimization techniques for permanent magnet AC motor drives:a review ［J］.IEEE Transactions on Industry Electronics, 1996, 43(2): 321330．
［4］ TAKEO I, GORDON R S. A method of reducing ripple torque in permanent magnet motors without skewing ［J］. IEEE Transactions on Magnetics,1993,29(2):20282031．
［5］ NICOLA B, SILVERIO B. Design techniques for reducing the cogging torque in surfacemounted PM motors ［J］. IEEE Transactions on Magnetics,2002,38(5):12591265．
［6］ BRETON C, BARTOLOME J, Benito J A, et al. Influence of machine symmetry on reduction of cogging torque in permanentmagnet brushless motors ［J］. IEEE Transactions on Magnetics,2000,36(5): 38193823．
［7］ 王秀和.永磁电机［M］.北京：中国电力出版社,2007:80114．
［8］ 王秀和,杨玉波,丁婷婷,等.基于极弧系数选择的实心转子永磁同步电动机齿槽转矩削弱方法研究［J］.中国电机工程学报,2005,25(15):146149．
WANG Xiuhe, YANG Yubo, DING Tingting, et al. The method for reducing cogging torque by suitable selection of polearc coerricient in soldrotor PM synchronous motors［J］. Proceedings of the CSEE, 2005, 25(15):146149．
［9］ 卢琴芬,范承志,叶云岳.新型抽油机用盘式永磁电机的磁场与力特性［J］.浙江大学学报:工学版,2008,42(4)：651655．
LU Qinfen, FAN Chengzhi, YE Yunyu. Magnetic field and force characteristic of disctype permanent magnet motor for novel pumping unit ［J］. Journal of Zhejiang University: Engineering Science, 2008,42(4): 651655．
［10］徐月同,傅建中,陈子辰.永磁直线同步电机推力波动优化及实验研究［J］.中国电机工程学报,2005,25(12)：122126．
XU Yuetong, FU Jianzhong, CHEN Zichen. Thrust ripple optimization and experiment for PMLSM［J］. Proceedings of the CSEE,2005,25(12): 122126．
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