C. Bi, Phyu Nu Hla, Yinquan Yu, C. S. Soh, Q. Jiang
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Influence of axial asymmetrical rotor in PMAC motor operation
To the permanent magnetic (PM) AC motor with the rotor aligned asymmetrically in axial direction, the motor magnetic field is axial-asymmetric. This asymmetric field generates unbalanced magnetic pull (UMP), and the analysis shows that, the UMP value varies in the motor operation. Analysis shows also that, if the number of stator slot is odd, the UMP center varies in the motor operation. The paper presents an analytical model for analyzing the effects of the UMP induced by the axial-asymmetrical rotor. The numerical results of PMAC motors are also presented, and they confirm the effectiveness of the analytical UMP model presented.
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