Minimization of torque ripple in Permanent Magnet Synchronous Motors through Direct Torque Control

Permanent Magnet motors are of pertinent use in factory automation, machine tool applications, electric vehicles, robotics applications and many others. Within these industries, the measure of accuracy that is required on a constant basis is stymied by the common obstacle of harmonic ripple in torque, caused by discrepancies in flux within the air-gap of the motors. This ripple reflects in performance of the motor drive and consequently causes a harmonic disturbance in stator current. In order to understand this phenomenon and come about various remedial practices, a detailed study is carried out in this project to investigate the causes of torque ripple in permanent magnet synchronous motor drives, and the methods used in the minimization of this ripple. Minimization of these ripples in torque would prove essential to save erroneous manufacturing deviations that they characterize in the above-mentioned industry applications. It would also help in saving industrial financial resources, increase reliability, as well as save time spent in corrections of these errors. A model is presented in MATLAB/Simulink to implement the Direct Torque approach of ripple minimization.