Comparison of Measurement Methods to Determine the Electromagnetic Characteristics of Switched Reluctance Motors

Three different experimental methods for the electromagnetic characterization of a switched reluctance motor (SRM) are presented in this paper. Two methods rely on static measurements. The first one permits the static torque measurement when one phase of the machine is fed by a direct current. The second one determines the flux characteristic when one phase of the machine is fed at standstill by an alternative current. The third is a flux dynamic characterization method, the SRM is driven at a constant speed and fed by a direct current. Because of the emf of the motor, the feeding current is never perfectly constant especially in the case of medium and high power SRM. A numerical method is then presented which permits to compensate the effects of this current ripple. Finally, the accuracy and the feasibility of the implementation of these methods are compared.