System and method for compressor motor protection

摘要

A refrigerant compressor includes an electric motor. A current sensor measures current flow to the electric motor. A switching device is configured to close and open to allow and prevent current flow to the electric motor, respectively. A maximum continuous current (MCC) device includes a stored digital value corresponding to a maximum continuous current for the electric motor. A motor protection module: communicates with the MCC device, the current sensor, and the switching device; determines a first MCC for the electric motor as a function of the stored digital value received from the MCC device; selectively sets a predetermined MCC to the first MCC; and controls the switching device based on a comparison of the current flow to the electric motor and the predetermined MCC.

主权项

1. A system comprising:
a refrigerant compressor including an electric motor; a current sensor that measures current flow to the electric motor; a switching device configured to close and open to allow and prevent current flow to the electric motor, respectively; a first maximum continuous current (MCC) device that includes a stored digital value corresponding to a maximum continuous current for the electric motor a second MCC device; a motor protection module that:
communicates with the first MCC device, the second MCC device, the current sensor, and the switching device;determines a first MCC for the electric motor based on the stored digital value received from the first MCC device;determines a second MCC for the electric motor based on an output of the second MCC device;sets a predetermined MCC to one of the first MCC and the second MCC; andcontrols the switching device based on a comparison of the current flow to the electric motor and the predetermined MCC.