Dynamic parameter torque control of high speed sinusoidal flux permanent magnet synchronous machines

This paper proposes a new method of torque control for a sinusoidal current controlled voltage source inverter drive that is used with sinusiodal flux permanent magnet synchronous machines in the higher speed (>3500 rpm) operating range. The method uses the dynamic machine model component values to predict current vector control trajectories for machine operation at either maximum torque per stator current ampere, or maximum torque conversion efficiency. The requirements for dynamic parameter control for maximum torque conversion efficiency are developed. The predicted trajectories are compared with those commonly used in conventional control algorithms based on a static machine model. The results presented in this paper indicate that the nonlinearity of the machine model components can not be ignored when performing torque control at higher speed operating points.