Torque Ripple Minimisation in Switched Reluctance Motors by Optimisation of Current Wave-Forms and of Teeth Shape with Copper Losses and V.A. Silicon Constraints

The main aim of this paper is the minimisation of torque riplle in a 6/4 switched reluctance motor by current waveforms and pole arc optimisation and with realistic constraints. This research is base on a magnetic structure with several sizes which remain constant: outer diameter (250 mm), stack length (150 mm), shaft diameter (42 mm) and airgap length (0.8 mm). Electromagnetic characteristics of 5 machines are computed by element finite method. Before these computations were computed, the main sizes of each machine were optimised by a quick analytical method to minimise copper losses at low speed and with an ideal square wave current supply. Then we determined, for each machine, the optimal current waveforms to minimise ripple torque taking account limit DC voltage.