Direct instantaneous current control of Switched Reluctance Motor Based on finite element simulation

Abstract

Switched reluctance motor (SRM) often adopts current chopping control (CCC) mode during startup and low-speed operation. The traditional CCC has good controllability. However, due to the nonlinear factors of the motor, the actual current cannot track the reference current in real time and there is a large torque ripple will occur in the commutation section of the motor at low-speed mode. Taking three-phase 6/4 SRM as an example, this paper presents a direct instantaneous current control of Switched Reluctance Motor based on finite element simulation. The current torque model is established through finite element simulation to realize the nonlinear mapping from torque to current, and the obtained current value is used to compensate the phase reference current; the total reference current is given by the speed loop and the reference current of each phase is obtained by combining the distribution function. After compared with the actual current, the error enters the fuzzy current chopper controller to optimize the current waveform and make the torque output stable. Finally, compared with the traditional CCC method, the simulation results show that the method is effective.