HERMETIC MOTOR COOLING AND CONTROL

摘要

An apparatus and method for cooling a compressor motor (152) having a motor stator (162) and cooling a rotor (166) in a refrigerant system (100). The method cools the rotor and the stator, electromagnetic bearings (160) located within a compressor housing by providing refrigerant liquid to the stator internal channels, the channels being in fluid communication with a rotor passageway (172), and a flow-control device (168) controlling refrigerant flow into the stator. A temperature monitoring device (176) in communication with a controller (140) monitors motor temperature. The controller (140) evaluates the motor temperature and adjusts refrigerant flow through the flow control device (168), maintaining the motor (152) within a predetermined temperature range.

主权项

1. A compressor assembly comprising:
a compressor housing; a compressor (100) positioned within the housing; a compressor inlet, to input refrigerant gas to the compressor (100); a motor (152), the motor comprising
a motor housing,a stator (162) positioned within the motor housing, the stator having windings and cooling channels (164),a rotor (166) positioned within the stator (162), the rotor having a shaft having a first end connected to an impeller (102) the compressor and a second end,wherein when electrical current is applied to the stator windings, the rotor (166) rotates, causing the compressor (100) to operate;electromagnetic bearings (160) positioned at both ends of the rotor (166) to support the rotor when current is applied to the stator windings; the motor (152) further including
a temperature monitoring device (176) positioned within the stator;a stator inlet (186) and a stator outlet (190), the stator inlet receiving liquid refrigerant for cooling the stator (162),a rotor inlet (192), a rotor liquid (170) drain and a rotor gas vent (174), the rotor inlet receiving refrigerant from the stator outlet (190);a flow control device (168) positioned to control the flow of refrigerant within the stator (162) in response to the temperature of the stator (162) and the rotor (166) as provided by the temperature monitoring device (176).