COMPUTATION AND EXPERIMENTAL-DETERMINATION OF RUNNING TORQUE WAVE-FORMS IN SWITCHED-RELUCTANCE MOTORS

The paper first describes a model for computing the dynamic behaviour, in particular the running torque waveform (transient or quasisteadystate), of a switched-reluctance (SR) motor under a variety of excitation conditions. An experimental method for determining the torque ripple is presented and its use for verifying the model is discussed. The computation is based on a published method for integrating the nonlinear differential equations of the SR motor. The experimental method determines the running torque waveform from current waveform measurements under running conditions and static torque measurements. Allowance is made in the measurements for mutual phase interaction in shared parts of the magnetic circuit. The new method is applicable to other types of machine in which electromagnetic torque is not produced by induction.