Techniques for Reduction of the Cogging Torque in Claw Pole Machines with SMC Cores

Chengcheng Liu, Jiawei Lu, Youhua Wang, Gang Lei, Jianguo Zhu and Youguang Guo
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Chengcheng Liu: State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300131, China
Jiawei Lu: State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300131, China
Youhua Wang: State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300131, China
Gang Lei: Schoolof Electrical, Mechanical and Mechatronic Systems University of Technology Sydney, Ultimo NSW 2007, Australia
Jianguo Zhu: Schoolof Electrical, Mechanical and Mechatronic Systems University of Technology Sydney, Ultimo NSW 2007, Australia
Youguang Guo: Schoolof Electrical, Mechanical and Mechatronic Systems University of Technology Sydney, Ultimo NSW 2007, Australia

Energies, 2017, vol. 10, issue 10, 1-17

Abstract: As one of the main parasitic parameters in permanent magnet (PM) synchronous machines (PMSMs), cogging torque is the main component of the torque ripple, which has always been the handicap in the high-performance, low-speed drive systems. Over the last two decades, various methods have been proposed to decrease the cogging torque in both radial-flux and axial-flux PMSMs. Among these methods, stator slot skewing, stator tooth notching, permanent magnet (PM) skewing, PM shifting, and pole pairing are extensively investigated. However, little work has been done on reducing the cogging torque of the claw pole machine (CPM), whose cogging torque cannot be ignored. In this paper, the general methods that have been used to reduce the cogging torque in radial-flux and axial-flux PMSMs are developed and verified in a CPM with a soft magnetic composite (SMC) core. The 3-D finite element method (FEM) is used to calculate the cogging torque and PM flux linkage per turn. By comparing different cogging torque reduction technologies, it can be found that the magnet step skewing and unequal claw pole width are very suitable for CPM.

Keywords: cogging torque; claw pole machine; soft magnetic composite (SMC); finite element method (FEM) (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: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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