To detect a locked state of a compressor 30 in a structure of a conventional electromagnetic clutch 1 without providing a separate component for detecting.
A lock detecting mechanism of a rotary machine with the electromagnetic clutch includes closed magnetic circuit forming means 3/5/6, leakage magnetic flux parts 5k/6k provided in a closed magnetic circuit Φ, an exciting coil 4 of the electromagnetic clutch 1 for supplying a magnetic flux to the closed magnetic circuit forming means 3/5/6, and an ECU 20 for detecting the locked state of the compressor 30 from a change of coil current flowing to the exciting coil 4. The ECU 20 detects the locked state of the compressor 30 according to a pulsation generated in the coil current from the magnetic flux change of the closed magnetic circuit Φ by leakage magnetic flux change parts 5k, 6k. Thus, the change of the magnetic flux in the electromagnetic clutch 1 is taken out as the change of the coil current from the exciting coil 4 for generating an attraction force of the electromagnetic clutch 1. In this manner, a low-cost clock detecting mechanism can be set without necessity of providing another detecting component.
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MATSUDA MIKIO
HAKAMATA NAOKI
INAGAKI MITSUO
UEDA MOTOHIKO
DENSO CORP