Torque ripple reduction in switched reluctance motors – A review

The generated torque ripple in switched reluctance motors (SRM) can be considered as one of the major disadvantages of the motor. It is mainly due to frequent switching of phases for rotation of the motor and changes of the air gap length between the rotor and stator teeth. It decreases the average developed torque, diminish the efficiency, causes noise and vibration in the motor. So, in order to improve the performance of SRM and extend its applications in industry, it is essential to reduce these torque ripple. So far, many torque ripple reduction methods have been introduced. These have been done through changing and improving the structure and geometry of the motor or using some control strategies. This paper reviews a variety of control strategies to reduce the torque ripple in SRM. Each of the methods described in details. Different techniques are compared and the best and most efficient one is introduced.