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 5:
6. A monitoring system comprising:
a compressor including 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 that has a semiconductor element and having a first temperature sensor that senses a temperature of the semiconductor element; and
a monitoring server that receives, from the compressor via a communication network, a running condition of the compressor, and a sensing result of the first temperature sensor, wherein
the monitoring server 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 of the compressor 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.