Abstract: An air-conditioning system includes a refrigeration cycle and a control unit. The refrigeration cycle includes an electric compressor in which a compression mechanism for drawing a refrigerant therein for compression is integrated with an electric motor for driving the compression mechanism, and a motor drive circuit for driving the motor is cooled using an intake refrigerant drawn into the compression mechanism. The control unit provides operational control to the motor drive circuit and the refrigeration cycle. When the temperature of the motor drive circuit has exceeded a predetermined temperature, the control unit varies a condition of supplying air to exchange heat with the refrigerant flowing through the refrigeration cycle to thereby reduce the temperature of the intake refrigerant.

Abstract: An air-conditioning system includes a refrigeration cycle and a control unit. The refrigeration cycle includes an electric compressor in which a compression mechanism for drawing a refrigerant therein for compression is integrated with an electric motor for driving the compression mechanism, and a motor drive circuit for driving the motor is cooled using an intake refrigerant drawn into the compression mechanism. The control unit provides operational control to the motor drive circuit and the refrigeration cycle. When the temperature of the motor drive circuit has exceeded a predetermined temperature, the control unit varies a condition of supplying air to exchange heat with the refrigerant flowing through the refrigeration cycle to thereby reduce the temperature of the intake refrigerant.

Abstract: An air-conditioning system includes a refrigeration cycle and a control unit. The refrigeration cycle includes an electric compressor in which a compression mechanism for drawing a refrigerant therein for compression is integrated with an electric motor for driving the compression mechanism, and a motor drive circuit for driving the motor is cooled using an intake refrigerant drawn into the compression mechanism. The control unit provides operational control to the motor drive circuit and the refrigeration cycle. When the temperature of the motor drive circuit has exceeded a predetermined temperature, the control unit varies a condition of supplying air to exchange heat with the refrigerant flowing through the refrigeration cycle to thereby reduce the temperature of the intake refrigerant.

Abstract: An electric-powered compressor comprised of a compression mechanism 110 for sucking in and compressing a refrigerant and an electric motor 120 for driving the compression mechanism formed integrally and provided at a refrigerant suction side of the compression mechanism with a motor drive circuit 130 for driving the motor, wherein at least part of a control circuit 132 provided at the motor drive circuit and controlling the operation of a switching device 131 for adjusting the power supplied to the motor is provided abutting against the surface of the refrigerant suction side 121 or a heat conduction path 124 extending from the surface.

Abstract: An air-conditioning system includes a refrigeration cycle and a control unit. The refrigeration cycle includes an electric compressor in which a compression mechanism for drawing a refrigerant therein for compression is integrated with an electric motor for driving the compression mechanism, and a motor drive circuit for driving the motor is cooled using an intake refrigerant drawn into the compression mechanism. The control unit provides operational control to the motor drive circuit and the refrigeration cycle. When the temperature of the motor drive circuit has exceeded a predetermined temperature, the control unit varies a condition of supplying air to exchange heat with the refrigerant flowing through the refrigeration cycle to thereby reduce the temperature of the intake refrigerant.

Abstract: An electric-powered compressor comprised of a compression mechanism 110 for sucking in and compressing a refrigerant and an electric motor 120 for driving the compression mechanism formed integrally and provided at a refrigerant suction side of the compression mechanism with a motor drive circuit 130 for driving the motor, wherein at least part of a control circuit 132 provided at the motor drive circuit and controlling the operation of a switching device 131 for adjusting the power supplied to the motor is provided abutting against the surface of the refrigerant suction side 121 or a heat conduction path 124 extending from the surface.

Abstract: Refrigerant passages in a compressor include an upper refrigerant passage and a lower refrigerant passage. The upper refrigerant passage is positioned above a datum line extending through a center of a rotor shaft of a compressor motor and perpendicularly to the rotor shaft, and the lower refrigerant passage is positioned below the datum line. A cross-sectional area of the upper refrigerant passage is larger than that of the lower refrigerant passage. Thus, even when lubricating-oil blocks the lower refrigerant passage, the refrigerant flows through the upper refrigerant passage, thereby reducing the pressure loss of the refrigerant, and preventing the lubricating oil from being caught in the refrigerant and discharged with the refrigerant from the compressor.