SYSTEM AND METHOD FOR CONTROLLING COMPRESSOR MOTOR VOLTAGE

摘要

A variable speed drive (VSD) can be used to vary the voltage-to-frequency ratio (V/f) supplied to a compressor motor of a heating, ventilation, air conditioning or refrigeration (HVAC&R) system to compensate for varying conditions in the HVAC&R system.

主权项

1. A method for controlling compressor motor voltage, the method comprising:
calculating a motor current based on an operating frequency of a compressor motor operating at a predetermined volts/frequency ratio; calculating a first current/volts ratio based on the calculated motor current, the operating frequency and the predetermined volts/frequency ratio; calculating a second current/volts ratio based on a measured motor current, the operating frequency and the predetermined volts/frequency ratio; comparing the calculated first current/volts ratio to the calculated second current/volts ratio; and adjusting a voltage provided to the compressor motor by a variable speed drive in response to the calculated first current/volts ratio being unequal to the calculated second current/volts ratio.