Electromagnetic clutch
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United States of America Patent
Stats
-
Dec 30, 2003
Grant Date -
Jan 30, 2003
app pub date -
Jul 2, 2002
filing date -
Jul 13, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Two sensors are provided on a clutch core. Sensor coils are driven at a high frequency by a high-frequency driving circuit. As the sensors sense a magnetic flux of a magnetic circuit including the clutch core and an armature, the impedance of the sensor coils changes. In accordance with the outputs from the sensor coils at this point, an impedance detecting circuit detects the impedance of the sensor coils. Then, an impedance combining circuit combines the impedance of the sensor coils. On the basis of the combined impedance, a current control circuit controls a current supplied to an exciting coil. Thus, the attracting force of the armature to the core excited by the exciting coil is controlled.
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