Patent ID: 8397534

Claim:
A chiller system comprising: a compressor assembly including a motor and an aerodynamic section, said motor including a rotor assembly operatively coupled with a motor shaft and a stator assembly to produce rotation of said motor shaft, said motor shaft and said aerodynamic section being arranged for direct drive of said aerodynamic section; a condenser section and an evaporator section, each operatively coupled with said aerodynamic section, said condenser section having a higher operating pressure than said evaporator section; a liquid bypass circuit that cools said stator assembly and said rotor assembly with a liquid refrigerant, said liquid refrigerant being supplied by said condenser section and returned to said evaporator section, said liquid refrigerant being motivated through said liquid bypass circuit by said higher operating pressure of said condenser section relative to said evaporator section; a gas bypass circuit that cools said rotor assembly with a gas refrigerant, said gas refrigerant being drawn from said evaporator section and returned to said evaporator section by pressure differences caused by said rotation of said motor shaft, and wherein said gas refrigerant from said evaporator section is mixed with said liquid refrigerant from said condenser section before entering said motor.