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《Transactions of China Electrotechnical Society》 2006-10
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Cogging Torque Reduction Method of Magnet Shifting in Permanent Magnet Motors

Yang Yubo1 Wang Xiuhe1 Zhang Xin1 He Guangfu2 (1. Shandong University Ji’nan 250061 China 2. Ji’nan City Construction Engineering Corporation Ji’nan 250031 China)  
The method of permanent magnet(PM) shifting to reduce cogging torque of PM motor was studied. It is found that if the slot number per pole is not an integer, new lower harmonics of cogging torque may be introduced when PM shifting is adopt. In order to reduce cogging torque by PM shifting, both the original harmonics and new lower harmonics of cogging torque should be reduced. The analytical expression of the harmonics of cogging torque with PM shifting was studied, and based on the analytical expression of cogging torque, the new method to obtain the PM shifting angles was achieved. At last the method is verified by finite element method.
【CateGory Index】: TM351
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