基于重复单元削弱永磁风力发电机齿槽转矩

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Abstract Cogging torque is one of the important issues for permanent magnet (PM) wind power generator. To reduce the cogging torque, the expression of the cogging torque is studied based on the Fourier analysis. In this paper, a concept of repeat unit is proposed. It is found that the cogging torque is multiple of the cogging torque generated of a repeating unit, and a certain harmonic of cogging torque could be eliminated by relative shifting of repeat units with proper shifting angles. Based on the repeat unit, a method of PM shifting to reduce cogging torque of permanent magnet machine is presented. The new method to obtain the PM shifting angles is achieved. At last the method is verified by finite element method. The results show that the method to obtain the PM shifting angles is simple. With this method the cogging torque can be greatly reduced.

Key words： Permanent magnet machine cogging torque permanent magnet shifting repeat unit finite element method

Received: 15 May 2010 Published: 10 March 2014

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TM351

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	Liu Ting
	Ouyang Honglin
	Huang Shoudao

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Liu Ting,Ouyang Honglin,Huang Shoudao. Reducing Cogging Torque in Permanent Magnet Wind Power Generators Based on Repeat Unit[J]. Transactions of China Electrotechnical Society, 2011, 26(12): 43-48.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2011/V26/I12/43

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