Improving Dynamic Performance of the Switched-Reluctance Motors

Abstract

Currently, in electric drives, valve motors on multiphase synchronous-reactive electric machines are widely used. The switching of the windings is carried out according to the signals of the rotor position sensor and from control system. The time of transient current changes during switching directly depends on the time constant of the windings. In machines of medium and high power, the time constant is significant, which increases the time of transient processes, and at high rotational speeds leads to a decrease in the average current in the winding, thereby reducing torque. An effective means of combating such phenomena are devices accelerating (forcing) transients during switching windings. The article proposes an original forcing circuit for multiphase electric machines and a circuit method for studying the transient time during switching windings. For example, a simulation model of the connection scheme of the windings of a three-phase electric machine with forcing elements is developed and waveforms of currents in the windings showing the effect of forcing are shown.