Abstract
This paper analyzes the performance of the three-phase variable reluctance stepper motor (VRSM) in case of single-phase excitation mode. Equations of phase self inductances, instantaneous phase and supply currents, phase and total torques, total input and output power as well as the efficiency are all deduced for any rotor position. Also the paper analyzes the effect of the early switching OFF of the supply on the performance characteristics of the motor. To avoid negative torque production, the switching OFF of the phase excitation should be controlled. In order to guarantee removal of the phase current before the phase inductance start to decrease, the instant of the switching OFF would take place before that of the teeth alignment
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