High-dynamic direct average torque control for switched reluctance drives

A technique was developed to estimate online average torque of switched reluctance machines. This novel online average torque and energy ratio estimation technique can be used for closed-loop torque control, i.e., direct average torque control. This closed-loop torque control algorithm continuously adjusts the reference torque by changing switching angles and reference current to maintain constant and accurate average shaft torque at a commanded torque level. Using the estimated average torque for regulation, the control structure can be simplified and decoupled from DC-bus voltage variations and other secondary control input parameters, such as temperature. The switched reluctance drive controller used in this study was developed and implemented for a 55 W electric-vehicle traction drive.