A variable frequency drive motor system includes a variable frequency drive motor and a controller coupled to the motor. The controller includes a rectifier, a direct current (DC) link bus, and an inverter. The controller is configured to determine that a brake has failed. In response to the determination that the brake has failed, the controller is configured to determine that power to the controller from a power supply has been interrupted. In response to the determination that power to the controller has been interrupted and a determination that a DC voltage across the DC link bus is below a first threshold value, the controller is configured to drive the motor at a faster speed.
Brake failure in variable frequency drive motors
2018-12-04
Patent
Electronic Resource
English
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