Torque Ripple Reduction Drive of Single-Phase SRM with PFC

In a single-phase switched reluctance motor (SRM) drive, the required DC source is generally supplied by the circuit consisting of a bridge rectifier and a filter capacitor connected with DC line terminal. Due to the large capacity of capacitor, the charging time of capacitor is very short from the AC source. Lead to the bridge rectifiers draws pulsating current from the AC source side, which results in degrading power factor and system efficiency. A novel single-phase SRM drive system is presented in this paper, which includes drive circuit realizing reduction of torque ripple and improvement of power factor with a novel switching topology. The proposed drive circuit adds one switch and diode, which can separate the output of AC/DC rectifier from the large capacitor and supply power to SRM alternately, in order to realize the torque ripple reduction and power factor improvement through the switching scheme. The validity of the proposed method is analyzed by mathematical modeling and tested by some simulations and experiments