Design and implementation of a direct torque controlled interior permanent magnet synchronous motor drive based on a novel flux model

Abstract

This paper studies a direct torque controlled interior permanent magnet synchronous motor (IPMSM) drive based on a novel flux model of the motor. First, a full digital PMSM drive is implemented based on a TMS320-F2808 DSP. Next, the paper studies the direct torque controlled method. By using the novel flux model, the controlled voltages can be decided correctly to eliminate the flux and torque errors. Moreover, the maximum torque per ampere control method is built on the new flux model. Then the optimum flux and torque angle commands can be obtained from the control method. In order to obtain the smooth torque of the motor, the space vector PWM control technique is used to reduce the ripples of the torque and currents. In addition, the estimators of flux angle and rotor speed are implemented by estimating the fluxes of the motor to omit encoder. Finally, some experimental results validate the correctness and the feasibility of the proposed control method.