Design of PWM Predictive Controller for SPMSM Drive

Permanent Magnet Synchronous Motor (PMSM) replaced Induction motor in various industrial applications. This is due to its higher efficiency and torque to inertia ratio. Also, PMSM has a compact size and lower maintenance requirements. Vector control is a successful technique for controlling PMSM because it offers maximum torque per current. To regulate two decoupled current components, The motor model needs to be transformed in a stationary reference frame. Hence the correct information of rotor position is required for smooth drive operation. Since encode based drives are costly and complicated nowadays observer-based drives are preferred which is generally termed as sensorless control. Amongst the advanced observer technique, the predictive control-based observer seems to be more effective in the modern drive application. The information obtained from the current loop is used to form an error function which works as an objective function to observe the speed of the motor. Vector controlled PMSM drive has two loops, the outer one is a speed control loop, and the inner is a current loop. The PI controller of the current loop is replaced by PWM Predictive Control in the current loop. The platform used for this is MATLAB /SIMULINK.