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Energies 2017, 10(10), 1541; doi:10.3390/en10101541

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

1
State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300131, China
2
Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province, Hebei University of Technology; Tianjin 300131, China
3
Schoolof Electrical, Mechanical and Mechatronic Systems University of Technology Sydney, Ultimo NSW 2007, Australia
*
Author to whom correspondence should be addressed.
Received: 13 September 2017 / Revised: 21 September 2017 / Accepted: 22 September 2017 / Published: 6 October 2017
(This article belongs to the Section Energy Fundamentals and Conversion)
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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. View Full-Text
Keywords: cogging torque; claw pole machine; soft magnetic composite (SMC); finite element method (FEM) cogging torque; claw pole machine; soft magnetic composite (SMC); finite element method (FEM)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Liu, C.; Lu, J.; Wang, Y.; Lei, G.; Zhu, J.; Guo, Y. Techniques for Reduction of the Cogging Torque in Claw Pole Machines with SMC Cores. Energies 2017, 10, 1541.

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