The Method of Pole Width Modulation Reducing Cogging Torque in Permanent Magnet Motor

Abstract:

Cogging torque is one of the most important parameters of permanent magnet motors, which causes torque ripple, vibration and noise. This paper describes the mechanism of cogging torque, introduces several methods of reducing cogging torque and points out the advantage of novel magnet arrayed permanent magnet motor in reducing cogging torque. Ansoft software is used to build the simulation of conventional surface-type permanent magnet motor and novel magnet arrayed permanent magnet motor and to calculate their cogging torque. a cogging torque testing system which included the angle sensor, permanent magnet motor, torque wrenches and other components are tested two different structures motors’ cogging torque .The experimental result is consistent with the simulation results, it shows that the method of novel magnet arrayed permanent magnet motor reducing cogging torque is correct. The new method compare with the same specification on the surface of permanent magnet motor can reduce more cogging torque.

• Periodical: Advanced Materials Research (Volumes 383-390)
• Pages: 1369-1375
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.383-390.1369
• Online since: November 2011
• Authors: Yue Jun An, Wen Qiang Zhao, Li Ping Xue, Hong Liang Wen, Guo Ming Liu
• Keywords: Finite Element Method (FEM), Permanent Magnet Motor, Reducing Cogging Torque, Torque Fluctuations

References

[1] Li Han; Mao Xin; Hong Xie; Hui; Li Hua Wei Numerical method for calculating cogging torque by simulation of actual measurement, [J]: Electric Machines and Control, 2007. 11.

[2] Shukang Cheng; Hailong Gong; Feng Chai; Hongwei Gao Study on Cogging Torque of Permanent Magnet In-wheel Motor, [J] Proceedings of the CSEE, 2009(30).

[3] Yubo Yang Xiuhe Wang Xin Zhang Guangfu He Cogging Torque Reduction Method of Magnet Shifting in Permanent Magnet Motors, [J] Transactions of China Electrotechnical Society. 2006(10).

DOI: 10.1109/cefc-06.2006.1633266

[4] Yuejun An, Changzhi Sun. A type of Pole Width Modulation Method of PMSM. China,: CN200720015431[P], (2007).

[5] Yuejun An, Peng Wang, Zhaojun Meng, et al. Pole Width Modulation Method of PMSM and Its Magnetic Field Analysis,. ICACC 2010, 27-29 March 2010, Shenyang/China, 376-380.

DOI: 10.1109/icacc.2010.5486995

[6] Fengge Zhang; Ningze Tong; Fengxiang Wang Different design techniques and comparison for reducing the cogging torque in a new type of PM stepping motor, [J] Journal of Hunan University of Science & Technology(Natural Science Edition), 2005(02).

DOI: 10.1109/icpst.2004.1460102