Sensorless Vector Control of Five-phase Induction Motor under Open-phases Fault

Abstract—This article deals with proposed solutions for five-phase induction motor drives, specifically aimed to sensorless vector control under an open-phases fault. Exploiting the modified transformation matrices for dual planes, the motor model in the synchronous frame is established under open phases. Torque ripple is reduced by particular magnitude ratio currents. Furthermore, the third harmonic current is used to improve iron utilization and torque density. The proposed sliding-mode observer method for wide-range speed estimation combined with online resistance identification is investigated, especially for low-speed operation. Experimental tests are performed to validate the effectiveness of the proposed method.

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