volume | PIER Journals

Abstract

Permanent magnet-assisted reluctance motors (PMa-SRM) feature high energy efficiency, high power density, and a wide speed regulation range. However, traditional direct instantaneous torque control (DITC) strategies for these motors are limited by issues such as high exciting phase current peaks and large torque ripple, which hinder their development and application. To address this, this paper proposes a novel DITC strategy based on current-torque collaborative control. First, commutation intervals are divided according to inductor curve characteristics, with adaptive hysteresis methods applied in different intervals. Then, to tackle high exciting current peaks, current chopping control is introduced, and an adaptive reference current adjustment algorithm is designed to control exciting phase current at the initial commutation stage based on motor speed and load, suppressing current peaks during commutation. Finally, simulations and prototype experiments are conducted on a three-phase 6/20 PMa-SRM. Results show that the proposed strategy effectively reduces current peaks and enhances torque output capability and dynamic response during commutation.

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Dr. Junjie Zhang

Dr. Junxin Xu

Dr. Chaozhi Huang

Dr. Ziyang Liu

Dr. Yiqiang Yu

Dr. Pengpeng Wei