SYSTEM AND METHOD FOR FAULT PROTECTION OF A MOTOR

摘要

An exemplary motor driving system includes a power source, a driving circuit, a controller, a motor, and a protection circuit. The driving circuit including at least one switching device coupled with the power source. The motor includes a plurality of windings. The motor is coupled with the driving circuit and driven by the driving circuit. The controller is configured to provide first switch signals to the at least one switching device of the driving circuit in a normal mode. The protection circuit is coupled with the controller, and configured to generate second switch signals based at least in part on a fault signal in a fault mode and provide the second switch signals to the at least one switching device of the driving circuit so as to reconstruct circuit loops between the driving circuit and the plurality of windings. A method for operating the motor driving system is also described.

主权项

1. A motor driving system, comprising:
a power source; a contactor coupled with the power source; a motor comprising a plurality of windings; a plurality of DC/DC converters coupled between the power source and the motor, wherein each DC/DC converter comprises:
an upper switch coupled with corresponding windings of the motor,a lower switch coupled with a low-voltage terminal of the power source, andan inductor coupled between the power source and a junction between the upper switch and the lower switch; a controller configured to provide first switch signals to the plurality of DC/DC converters in a normal mode; and a protection circuit coupled with the controller, configured to generate second switch signals based on a fault signal in a fault mode, wherein the second switch signals comprise:
an open signal provided to the contactor to cut off the power source from the motor;a turn-on signal provided to the upper switch of each DC/DC converter; anda turn-off signal provided to the lower switch of each DC/DC converter.