Switched reluctance motor with magnetic slot wedges for automotive traction application

¹ GeePs, Group of Electrical Engineering Paris, UMR CNRS 8507, CentraleSupélec, Univ Paris-Sud, Sorbonne Universités, UPMC Univ Paris 06, 3, 11 rue Joliot-Curie, Plateau de Moulon, 91192 Gif-sur-Yvette Cedex, France
² Renault, 1 avenue du Golf, 78288 Guyancourt, France

^a e-mail: mhbelhadi@yahoo.fr

Received: 28 July 2015
Revised: 10 November 2015
Accepted: 16 November 2015
Published online: 18 December 2015

Abstract

The switched reluctance motor (SRM) is very attractive because of its many advantages especially in electric vehicle (EV). However, it presents two major drawbacks: torque ripples and stator vibrations. These phenomena are the cause of a disturbing noise. In order to reduce the torque ripples and the radial force (main cause of the stator vibrations), one solution is to add magnetic slot wedges. In this paper, a SRM with wedges is compared to the conventional one including some static and dynamic features. First, field lines, magnetization curves and static torques are discussed. Secondly, torque-speed curves, harmonic analyzes and cartographies with minimum ripples are compared. The last includes several operating points (speed-torque) in steady state.