Improvement of torque control system of PMSM based on model predictive control

This paper describes improvement of torque control system of permanent magnet synchronous motor (PMSM) based on model predictive control (MPC). MPC controller selects directly one of the voltage vector of PWM inverter by estimating and evaluating future states (torque, current) of PMSM instead of generating voltage reference as conventional one. The sequence of selected voltage vectors makes inverter output voltage appropriate on the transient state in addition toone the steady state. As a result, this system obtains fast current response. The time resolution of inverter output voltage, however, is restricted to control period. Under the condition of feasible control period, control performance particularly in steady state may not be enough. In this paper, improvement of the time resolution in MPC control system with enough performance is discussed and the simulation results are shown.