Method of controlling electromagnetic clutch and compressor system

摘要

A friction type electromagnetic clutch (17) is interposed between a vehicle engine Eg and a compressor. The clutch has a drive rotor (31) and a driven armature (34) which are coupled together by a current input, thereby making it possible to transmit power. When the compressor is started, the control computer fixes the input current value to the electromagnetic clutch to a maximum value and maintains it for a certain time period, When the compressor is in operation after the certain time period has elapsed, the control computer changes the input current value to the electromagnetic clutch depending on the load on the compressor and thus adjusts the coupling force between the drive rotor and the driven armature.