CURRENT ABNORMALITY DETECTION SYSTEM AND METHOD FOR SHUNT MOTORS
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United States of America Patent
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Issued Date -
Dec 13, 2007
app pub date -
Aug 3, 2005
filing date -
Aug 23, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A current abnormality detection system and method for shunt motors having a battery as a power source and an armature coil and a field coil controlled by an armature drive circuit and a field drive circuit formed in a controller, each drive circuit having a respective current sensor, An abnormal condition is determined when no less than a specified time has elapsed in a condition in which the difference between a current command value of the field coil with respect to the amount of current-flow in the armature coil and the current detection value of the field coil exceeds a given tolerance value.
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