| 摘要 |
A driving circuit for a switched reluctance motor includes a current sensor 50 which senses current flowing into the motor driving circuit and outputs a signal V1. A comparator 60 compares the signal V1 with a reference current level Vref, and outputs a stop signal V2 if the current flowing in the motor driving circuit exceeds the reference level. A signal selecting unit 70 receives the signal V2 from the comparator, a pulse width modulated signal and a rotor position signal, and outputs gate controlling signals for turning off motor phase switching elements during an input of the stop signal from the comparator. The protection of the driving circuit against excess current improves reliability of the motor, as well as eliminating the ripple component in the driving current (torque ripple) generated at the time of an initial start-up of each phase, which reduces the noise produced by the motor. |
