US 11,906,225 B2
Method and system for controlling compressor temperature
Charles A. Cluff, Zionsville, IN (US)
Filed by Carrier Corporation, Palm Beach Gardens, FL (US)
Filed on Feb. 4, 2021, as Appl. No. 17/248,730.
Claims priority of provisional application 62/979,753, filed on Feb. 21, 2020.
Prior Publication US 2021/0262717 A1, Aug. 26, 2021
Int. Cl. F25B 49/02 (2006.01); G05B 15/02 (2006.01); F04D 27/00 (2006.01)
CPC F25B 49/022 (2013.01) [F04D 27/00 (2013.01); G05B 15/02 (2013.01); F25B 2500/08 (2013.01); F25B 2600/0252 (2013.01); F25B 2700/151 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for heating a compressor when the compressor is off, the compressor having a motor including a rotor and a stator, and a control assembly operably coupled to the compressor, the method comprising the steps of:
applying an initial current to the compressor motor when the compressor is off;
measuring a voltage across the compressor motor and determining a resistance of the compressor motor based on the initial current and a measured voltage, the determined resistance corresponding to a temperature of the compressor;
determining whether the determined resistance is less than or equal to a desired resistance, the desired resistance corresponding to a desired temperature; and
applying a secondary current to the compressor motor if the temperature is less than or equal to the desired temperature.