Research on Novel Direct Instantaneous Torque Control Strategy for Switched Reluctance Motor

Shuanghong Wang,Zihui Hu,Xiupeng Cui

doi:10.1109/access.2020.2986393

Abstract

In order to solve the frequent problem of breaking shaft in the starter/generator system of switched reluctance motor, a novel Direct Instantaneous Torque Control (DITC) is proposed to control the torque ripple in this paper. Instead of the hysteresis controller in traditional DITC, the PWM is introduced to modulate the torque deviation; the optimal switching signal is selected according to the PWM modulation signal and the sector where the rotor position is located. Based on the torque characteristic curves, the torque ripple during commutation period is analyzed and the compensation methods are proposed. Simulation results prove that the compensated PWM-DITC can suppress the torque ripple of switched reluctance motor effectively.

Highlights

As a new generation of drive motor, switched reluctance motor (SRM) has simple structure, no winding on the rotor side, high operating efficiency; unipolar current, few power devices, and high reliability; Each phase runs independently with high fault tolerance [1]–[4]
The research focusing on torque ripple suppression has great engineering value, and is an urgent problem to be solved at present
In order to solve the problem that switching frequency of Direct Instantaneous Torque Control (DITC) is out of control, this paper proposes a novel DITC control strategy

Summary

INTRODUCTION

As a new generation of drive motor, switched reluctance motor (SRM) has simple structure, no winding on the rotor side, high operating efficiency; unipolar current, few power devices, and high reliability; Each phase runs independently with high fault tolerance [1]–[4]. Considering SRM starting/generating system taking into account both torque ripple under electric state and efficiency under power generation state, three-phase 12/8 pole SRM is selected as the research object of this paper. Taking A-phase winding in the electric state as an example, when the upper and lower switching tubes G1, G2 are both switched on, the winding is subjected to a positive voltage, and the winding current rises, which is called the excitation mode. As long as the sector is reasonably allocated, DITC can switch freely in the state of electric and generation

THE PROPOSED DITC

THE SIMULATION ANALYSIS

CONCLUSION