Subsection PWM Variable Duty Cycle Control of Switched Reluctance Motor Based on Torque Sharing Function

Abstract

Aiming at solving the problem that the conventional Torque Sharing Function (TSF) control strategy of the Switched Reluctance Motor (SRM) has the disadvantages of poor tracking performance of phase current and high torque ripples. an optimized TSF-based Pulse Width Modulation(PWM) variable duty cycle control of the SRM is proposed in this paper, which is combined with PWM and subsection control. In this method, the excitation voltages of the phase windings are regulated by the duty cycle of PWM, and different control intervals are divided by the inductance linear model for achieving excellent control performance. Different duty cycles are applied for these different conduction intervals respectively. The optimal duty cycles under different speed and reference torque are obtained by the dynamic simulation results. Meanwhile the duty cycle-speed-torque function formula is fitted. Finally, simulation and experimental results further verify the effectiveness of the proposed method. The optimized control method can overcome the limitation of traditional TSF control, and achieve good current tracking performance.