A new modified asymmetric bridge drive circuit switched reluctance motor

Switched reluctance motor (SRM) drive has a remarkable characteristic, which makes it attractive for high-speed in low voltage applications. In this paper, a new drive circuit from the bridge family which uses resonant circuit during discharge period is presented. The new topology provides faster rate of current discharge. The basic control strategy for a switched reluctance motor drive circuit is explained. In the new circuit, a capacitor is connected in series with the motor windings. This capacitor is charged resonantly by the use of motor phase windings during the phase turn off periods. In addition, an energy recovery circuit causes the trapped energy on resonant capacitor to be recovered by a single quadrant chopper comprising of a transistor, a capacitor and a diode. This topology provides faster rate of fall for the phase current, which permits the motor to operate at higher speeds A detailed explanation and demonstration of the converter circuits have been presented.