Patent ID: 11933291
Assignee: HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  G  H | IPC F  G  H

Claim 0:
1. A compressor comprising:
a motor;
a motor control system that controls a rotation speed of the motor;
a compressor body that compresses a gas by being driven by the motor;
a pressure sensor that is provided on a discharge side of the compressor body and senses a pressure of the compressed gas; and
a running controller that performs switching between load running and no-load running on a basis of the pressure sensed by the pressure sensor,
the motor control system having
a motor controller that controls power to be supplied to the motor via a circuit having a semiconductor element, and
a first temperature sensor that senses a temperature of the semiconductor element, wherein

at least one of the motor controller and the running controller is configured to:
calculate a relative temperature of the semiconductor element relative to a reference temperature by using the temperature sensed by the temperature sensor at time of switching from no-load running to load running; and
calculate an amount of change in a remaining lifetime of the semiconductor element corresponding to the relative temperature of the semiconductor element, whereby the remaining lifetime of the semiconductor element is monitored.