Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1998-12-08
1999-11-02
Ro, Bentsu
Electricity: motive power systems
Limitation of motor load, current, torque or force
388903, 3889075, H02H 708, G08B 2100
Patent
active
059777338
ABSTRACT:
A fan control device includes a fan rotation control circuit adapted to be connected electrically to a fan and adapted to control activation and deactivation of the fan. The fan rotation control circuit generates a voltage output corresponding to driving current flowing through the fan to indicate operating speed of the fan. A comparator circuit is connected to the fan rotation control circuit and is operable so as to perform a comparison operation in order to compare the voltage output of the fan rotation control circuit with a reference speed signal, and so as to generate a logic output corresponding to result of the comparison operation. A processor receives the logic output of the comparator circuit, and controls the fan rotation control circuit to deactivate the fan upon determining that the operating speed of the fan is abnormally slow, indicating that the fan is in a near-breakdown condition, based on the logic output of the comparator circuit. A warning circuit is connected to and controlled by the processor so as to generate a warning output upon determination by the processor that the operating speed of the fan is abnormally slow.
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Ro Bentsu
Shin Jiuh Corporation
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