A Method for Direct Instantaneous Torque Control of Switched Reluctance Motor Using Variable Hysteresis Pulse Width Modulation
For the traditional switched reluctance motors(SRM)which are based on direct instantaneous torque control method,it is easy to have the problem of torque ripple when controlled by fixed hysteresis control method.To solve this problem,a new direct instantaneous torque control method based on variable hysteresis PWM is proposed.Firstly,the operation intervals of the SRM are determined,and then the hysteresis functions for each interval are set up and optimized.After that,based on the optimized hysteresis function,the current rotor position angle,and the corresponding torque deviation,a variable hysteresis PWM control method is proposed to control the switches of the power conversion circuit,so that the torque ripple is able to gets suppressed.Finally,simulations were conducted to verify the effectiveness of this method,and comparative analysis with the traditional fixed hysteresis-based direct instantaneous torque control method was also performed.Results show that the new method have huge application value.It can not only significantly reduce the torque ripple of the SRM,but also effectively improves its operational efficiency.