Torque Ripple Suppression and Current Regulation for Vector Controlled Switched Reluctance Motors

Since the large torque ripple is one of the main problems of Switched Reluctance Motors (SRMs), it is necessary to develop precise torque control methods for SRMs. The current also need to be accurately controlled in order to obtain better torque control performance. For permanent magnet motors, vector control is a mature control method that can be used to smoothly control current and torque. However, it is difficult to use vector control to drive SRMs because of their non-linear and time-varying characteristics. In this paper, a current controller is designed based on internal model principle. It can be utilized to control current with nearly no tracking error and does not require precise pre-measured inductance data. The torque expression is decoupled into two parts, thus torque average value and torque ripple can be controlled separately. Consequently, it's able to drive SRMs at maximum torque per ampere condition and reduce the torque ripple at the same time.