Abstract
A non-sinusoidal power supply is usually applied in a multiphase induction motor drive in order to improve the torque density with harmonic current injection. The harmonic parameters in the motor are essential for harmonic current proportion derivation. In the present work, detailed inductance parameters are derived, and an optimized non-sinusoidal power supply is proposed based on harmonic parameter analysis. The traditional method considers only air-gap flux density distribution optimization, while the yoke flux density is ignored. The proposed method focuses on optimizing the air-gap flux density and yoke flux density simultaneously. The proposed method improves the stator iron utilization, and the torque density and efficiency are enhanced under heavy loads. Finally, 15 kW and 630 kW nine-phase motor drives are constructed, and the proposed non-sinusoidal power supply control strategy is validated experimentally.
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