MOTOR-COMPRESSOR HEATER USING ELECTRONIC MOTOR CONTROL
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2001-Nov-09
In a typical residential or small commercial air conditioner (or heat pump), it is desirable to keep the temperature of the motor compressor warmer than its surrounding so that the freon doesn't get absorbed into the oil and cause problems with the compressor. This is usually accomplished by installing a discrete heater on the compressor and selec- tively exciting the heater when the compressor and/or its drive motor are not running and are therefore not self generating the needed heat.