Abstract
This paper investigates spatial harmonic magnetic field coupling effect on torque ripple for multiphase induction motor under open fault condition. The coupling results in severe torque ripple generated by ellipse asynchronous magnetomotive force, and the current space vectors are utilized for coupling phenomenon analysis in the multiple planes. The optimal current space vector is proposed to achieve the minimum torque ripple, and the traditional method is used for comparison. Both fundamental and harmonic current space vectors are derived, when single-phase and two-phase open fault conditions are analyzed, respectively. Furthermore, the proportional integral resonant controller is used to realize zero-error tracking, and proper values of parameters in the transfer function are derived. Finally, a five-phase variable speed drive system is constructed and the proposed method is validated by experiments.
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