Revista de Sistemas Elétricos e Eletrônicos

Dummy Slots Effect on the Torque Ripple and Electromagnetic Forces for Small Permanent Magnet Brushed DC Motors

Abstract

Mohamed Ali Ben Hamed, Thierry Tollance, Michel Hecquet, Frederic Gillon and Abdelmounaim Tounzi

Permanent magnet brushed DC motors are used in several applications such as home automation or automotive industry. This is mainly due to their lightweight, low cost and compact structure. Thus, the importance to study the sources of noise and vibration in these motors, which is often complicated and can be attributed to many factors. In this paper, the cogging torque and electromagnetic forces are studied in the case of a small permanent magnet brushed DC motor with 2 poles and 3 slots. Addition of dummy slots on the rotor side is described with its effect on the evolution of both aspects. The aim of this study is to give the quantitative effect about torque ripple and radial forces for each harmonic in relation with these dummy slots.