Predictive control based constant current injection scheme for characterization of switched reluctance machine

A novel current controller for constant current injection based characterization of switched reluctance machine (SRM) is proposed here. Unlike conventional characterization methods, where the rotor is locked at a fixed position, the current injection based method maintains the phase current constant while the machine is run at constant speed. The proposed constant current injection scheme yields the partial derivatives of the flux linkage characteristics directly, which can then be used in SRM controllers. The predictive control based current control works without the machine model being available already. The proposed current controller is then used to characterize an SRM. The characteristics obtained are found to be in good agreement with those obtained using conventional locked rotor test.