REFRIGERANT COMPRESSOR WITH ROTATION DETECTING MEANS

摘要

A refrigerant compressor having a drive shaft for driving a compressing mechanism and driven by a drive power transmitted from an external drive power source, and a rotation detecting unit for detecting the rotating speed of the compressor by detecting a change in the magnetic flux leaking from the solenoid clutch and circulating through a predetermined magnetic circuit. The change in the magnetic flux is caused by rotation of a magnetic plate-like element having at least one cutout which moves past the magnetic detecting unit, and a permanent magnet fixedly held by the housing assembly of the compressor is arranged so as to increase the density of the magnetic flux circulating through the predetermined magnetic circuit whereby the change in the magnetic flux caused by the rotation of the magnetic platelike element becomes rapid.