ABSTRACT
The interior permanent magnet synchronous motor (PMSM) plant has an equal stator inductance that increases the electromagnetic torque named reluctance torque. However, controlling the speed and torque for this type of motor becomes difficult with the surface-mounted PMSM machine. So a modified linear model predictive control is presented in this chapter that may obtain high-speed tracking performance in the flux-weakening region.
The objective function of the modified control fits the performance of the linear model predictive control strategy. The objective function evaluates the speed error directly instead of evaluating the stator current error of the q-axis to indicate the motor speed and torque. Therefore, the modified predictive control strategy can increase the velocity tracing performance. Additionally, a flux observer of the modified first-order integration is considered in this chapter to calculate the electromagnetic torque required in the speed prediction. The finite control strategy evaluates the cost function to select the optimal control input of the reference stator voltage components. Finally, simulation studies are presented to verify the effectiveness of the modified predictive control during perturbation of reference torque and abrupt changes in reference velocity.
