SYSTEMS AND METHODS FOR DETECTING APPLIANCE PUMP CAVITATION OR DRY STATE

摘要

Systems and methods for detecting appliance pump cavitation or dry state are provided. An exemplary appliance can include a current measurement circuit configured to provide a feedback signal that describes an inverter current drawn by an inverter providing three-phase power to the pump motor. A control unit of an appliance can detect pump cavitation and dry state by monitoring the feedback signal. Another exemplary appliance can include a motor speed detection circuit configured to provide a motor speed signal describing the speed of the pump motor. The control unit of the appliance can monitor variance in pump motor speed to detect pump dry state or cavitation. An exemplary method includes monitoring either an inverter current used by an inverter to drive a motor or a variance in a rotational speed of the motor.

主权项

1. An appliance comprising:
a control unit comprising a processor and a memory; a pump comprising a three-phase motor; an inverter for providing three-phase power to the three-phase motor; and a current measurement circuit configured to provide a feedback signal describing an inverter current drawn by the inverter across a DC bus; wherein the control unit is configured to perform operations, the operations comprising:
detecting that the pump is cavitating or in a dry state based on the feedback signal; andcontrolling one or more operations of the appliance when it is detected that the pump is cavitating or in the dry state.