Minimization of torque ripple in ferrite-assisted synchronous reluctance motors by using asymmetric stator

Abstract

Torque ripple is one of the important issues for ferrite assisted synchronous reluctance motors (FASRMs). In this paper, an asymmetrical stator is proposed for the FASRM to reduce its torque ripple. In the proposed FASRM, an asymmetrical stator is designed by appropriately choosing the angle of the slot-opening shift. Meanwhile, its analytical torque expressions are derived. The results show that the proposed FASRM has an effective reduction in the cogging torque, reluctance torque ripple and total torque ripple. Moreover, it is easy to implement while the average torque is not sacrificed. © 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license

Analytical Method to Optimum design of Synchronous Reluctance Motor for Electric Scooter Application

“…Diverse models of rotors with a different form of permanent magnet placement have been proposed for better motor performance [3]- [5], but adding a permanent magnet will cause problems such as cogging torque, strong armature reaction, as well as difficulty in assembling the motor. Studies to reduce torque ripple in a reluctance synchronous motor can be generally divided into three categories: the first category is the research on control methods [6]- [7] and the second category whose research focuses on design parameters, especially rotor design, the idea of choosing an asymmetric stator to reduce the torque ripple is suggested in [8]. Displacing rotor poles and creating a rotor with asymmetric poles can be another approach to reduce torque ripple [9].…”