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This paper describes a method to reduce cogging torque in permanent magnet (PM) machines by shifting elementary-cogging unit (ECU). The ECU division principle and the feature of cogging torque produced by ECU are also discussed. The proper shift angles for each ECU are deduced according to both fractional and integral slot number per pole, by which any order harmonic cogging torque could be eliminated...
Cogging torque is one of the important issues for permanent magnet machines. Due to the interaction between the permanent magnets and slotted armature lamination, there exists cogging torque in slotted permanent magnet machines, which may cause noise and vibration. To reduce the cogging torque, the expression of the cogging torque was studied based on the Fourier analysis in this paper. Based on the...
This paper mainly studies the performance of fractional slot/pole permanent magnet synchronous motor (PMSM) due to different winding layer and slot/pole combinations. According to the proposed 2D models of 18 slot/8pole, 18slot/16pole and 18slot/20pole PMSM with single and double layer winding, we can obtain the winding arrangement. We can also get torque ripple, cogging torque, back-EMF and magnetic...
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