5Chang Seop Koh,Byung-Kil Kang,Jae-Seop Ryu,Jin-Soo Seol.The effects of the distribution of residual magnetization of the cogging torque and switching signals in permanent magnet motors[J].Magnetics,IEEE Transactions on 2002,(38)5:1217-1220
6Ackermann,B.,Janssen,J.H.H.,Sottek,R.,van Steen,R.,I.New technique for reducing cogging torque in a class of brushless DC motors[J].Electric Power Applications,IEE Proceedings B,1992(139)7:315-320
7Chang Seop Koh,Hee Soo Yoon,Ki Woong Nam,Hong Soon Choi.Magnetic pole shape optimization of permanent magnet motor for reduction of cogging torque[J].Magnetics,IEEE Transactions on,1997(33)5:1822-1827
8Gao Hongzhan,Gu Qishan.AIR GAP FIELD FOR PM ELECTRIC MACHINES[J].Electric Machines and Power Systems,1985(10)5-6:459-470
9Zhu,Z:Q.,Howe,D.,Bolte,E.,Ackermann,B.Instantaneous magnetic field distribution in brushless permanent magnet DC motors[J].I.Open-circuit field Magnetics ,IEEE Transactions on,1993,(29)124-135