Abstract: A compressor, a monitoring system and a method of monitoring a compressor that make it possible to monitor the remaining lifetime of a semiconductor element of a motor control system while the processing load is reduced are provided. A compressor (1) includes: a motor control system (10) that controls the rotation speed of a motor (2); a compressor body (3) that compresses air by being driven by the motor (2); a pressure sensor (20) that is provided on the discharge side of the compressor body (3); and a running controller (11) that performs switching between load running and no-load running on the basis of the pressure sensed by the pressure sensor (20).

Abstract: The purpose of the present invention is to improve the reliability of a power conversion system while reducing the size. In addition, the purpose of the present invention is to reduce noise. This power conversion system has a first power converting device that supplies power to a first motor and a second power converting device that supplies power to a motor different from the first motor, wherein the first power converting device and the second power converting device are each provided with a power converter for converting the power to be supplied to the motors, and a control unit for controlling the power converter, and the first power converting device is provided with a transformer unit for supplying power to the control units, and the transformer unit of the first power converting device supplies power to the control unit in the second power converting device.

Abstract: A compressor, a monitoring system and a method of monitoring a compressor that make it possible to monitor the remaining lifetime of a semiconductor element of a motor control system while the processing load is reduced are provided. A compressor (1) includes: a motor control system (10) that controls the rotation speed of a motor (2); a compressor body (3) that compresses air by being driven by the motor (2); a pressure sensor (20) that is provided on the discharge side of the compressor body (3); and a running controller (11) that performs switching between load running and no-load running on the basis of the pressure sensed by the pressure sensor (20).

Abstract: The purpose of the present invention is to improve the reliability of a power conversion system while reducing the size. In addition, the purpose of the present invention is to reduce noise. This power conversion system has a first power converting device that supplies power to a first motor and a second power converting device that supplies power to a motor different from the first motor, wherein the first power converting device and the second power converting device are each provided with a power converter for converting the power to be supplied to the motors, and a control unit for controlling the power converter, and the first power converting device is provided with a transformer unit for supplying power to the control units, and the transformer unit of the first power converting device supplies power to the control unit in the second power converting device.