Torque Ripple Minimization of a Five-Phase Induction Motor Under Open-Phase Faults Using Symmetrical Components

Shan He,Xin Sui,Frede Blaabjerg,Min Kang,Dao Zhou,Zijian Liu

doi:10.1109/access.2020.2998867

Shan He, Xin Sui + Show 4 more

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In order to minimize the torque ripple of five-phase induction motor under open-phase faults, the conventional strategy makes the stator current space vectors to move along the circular anticlockwise trajectories. However, the torque ripple is suppressed indirectly based on the coupling between spatial harmonic fields, and the analytical expression of the torque ripple is not considered. In this paper, according to the steady-state model using symmetrical components (SCs), the torque ripple is mainly caused by the first and fourth SCs. Hence, several possible current commands are deduced under single-phase fault and two-phase fault by suppressing the first and fourth SCs. Under single-phase fault, the proposed strategy shows better performance than the conventional strategy in terms of torque ripple, average torque and efficiency. Under adjacent two-phase fault, the proposed strategy shows lower torque ripple but a lower efficiency than the conventional strategy, and these two strategies can be selected according to the specific application requirements. Finally, the effectiveness of the proposed strategy is validated by the experimental results.

Highlights

Multiphase motors have been widely used in air-craft drives, locomotive traction, electric ship propulsion and highpower industrial applications [1], [2]
PROPOSED MINIMUM TORQUE RIPPLE STRATEGY UNDER SIGLE-PHASE FAULT Because Te14 plays a major role in the torque ripple, the first and fourth sequence currents are proposed to be suppressed in this paper
PROPOSED MINIMUM TORQUE RIPPLE STRATEGY UNDER TWO-PHASE FAULT the fundamental sequence currents are same with the conventional strategy based on the constraint in (18)-(19) and the fundamental MMF invariance

Summary

Introduction

Multiphase motors have been widely used in air-craft drives, locomotive traction, electric ship propulsion and highpower industrial applications [1], [2]. The conventional minimum torque ripple strategy makes the fundamental current space vector to move along the circular trajectory in order to eliminate the coupling [25]. During the post-fault operation, the third harmonic current space vector will generates the coupled fundamental MMF rotating at ±3ω.

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