A Novel Cogging Torque Simulation Method for Permanent-Magnet Synchronous Machines

Chun-Yu Hsiao, Sheng-Nian Yeh and Jonq-Chin Hwang
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Chun-Yu Hsiao: Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
Sheng-Nian Yeh: Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
Jonq-Chin Hwang: Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan

Energies, 2011, vol. 4, issue 12, 1-14

Abstract: Cogging torque exists between rotor mounted permanent magnets and stator teeth due to magnetic attraction and this is an undesired phenomenon which produces output ripple, vibration and noise in machines. The purpose of this paper is to study the existence and effects of cogging torque, and to present a novel, rapid, half magnet pole pair technique for forecasting and evaluating cogging torque. The technique uses the finite element method as well as Matlab research and development oriented software tools to reduce numerous computing jobs and simulation time. An example of a rotor-skewed structure used to reduce cogging torque of permanent magnet synchronous machines is evaluated and compared with a conventional analysis method for the same motor to verify the effectiveness of the proposed approach. The novel method is proved valuable and suitable for large-capacity machine design.

Keywords: cogging torque; permanent magnet; finite element method; half magnet pole pair (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2011
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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