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In order to reduce cogging torque of permanent magnet (PM) motor, the lower harmonics of cogging torque should be reduced. It is found that if the slot number per pole is not an integer, new lower harmonics of cogging torque may be introduced when the method of asymmetry magnet is adopted. To reduce cogging torque, both the lower original and newly introduced harmonics of cogging torque should be...
It is found that if the slot number per pole is not an integer, new lower harmonics of cogging torque may be introduced when permanent magnet (PM) shifting is adopted. To reduce cogging torque, both the original and newly introduced lower harmonics of cogging torque should be reduced. In this paper, the effect of PM shifting on Bnz(B nz is the Fourier coefficient of the square of magnetic flux density...
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