Abstract: Electrical pole-changing technology leads to torque ripple and speed fluctuation despite broadening the constant power speed range of the multiphase induction machine (IM) system. To reduce the torque ripple and speed fluctuation of the machine, we investigate an exponential response electrical pole-changing method for five-phase IM with a current sliding-mode control strategy. This control strategy employs the dual-plane (d₁–q₁ and d₂–q₂) vector control method, which allows the IM to operate under different pole modes. Current sliding-mode controllers are applied instead of conventional proportional integral (PI) controllers to adjust the current vectors, and exponential current response achieves a smooth transition between the d₁–q₁ and d₂–q₂ planes. Compared with the step response pole-changing with PI control method, the proposed pole-changing method greatly reduces the torque ripple and speed fluctuation of the IM during the pole-changing process. Experimental results verify the exceptional performance of the proposed electrical pole-changing strategy.

Key words: Five-phase induction machine; Pole-change; Sliding-mode control; Exponential response; Torque ripple reduction

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