Patent ID: 7922467
Filing Date: 2011-04-12
Classification: F04D,F25B,H02K,Y10T

Abstract:
1. A refrigerant system, comprising: a conductive housing made of a conductive material, the conductive housing includes a motor housing and a compressor housing; a refrigerant disposed within the conductive housing; a motor that includes a rotor, a shaft extending from the rotor, a stator winding disposed within the motor housing in proximity with the rotor, and a bearing supporting the shaft and the rotor within the motor housing; a compressing element disposed within the compressor housing and being coupled to the rotor such that rotation of the rotor motivates the compressing element to compress the refrigerant; an adjustable frequency drive that provides the stator winding with three-phase electrical power to rotate the rotor; three conductors electrically coupling the adjustable frequency drive to the stator winding such that the three conductors can convey the three-phase electrical power to the stator winding; an inductor comprising a ring of magnetic material encircling the three conductors; a refrigerant loop comprising the conductive housing, a first heat exchanger, an expansion device, and a second heat exchanger, wherein the compressing element forces the refrigerant to circulate through the refrigerant loop; a common mode current loop comprising the adjustable frequency drive, the three conductors, the stator winding, a capacitive coupling between the compressing element and the conductive housing; and a loop of electrical continuity comprising the conductive housing, the first heat exchanger, the second heat exchanger, a discharge line extending between the conductive housing and the first heat exchanger, a suction line extending between conductive housing and the second heat exchanger, and an expansion line extending between the first heat exchanger and the second heat exchanger.