Monitoring apparatus for monitoring electrical drive current for an electric motor
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United States of America Patent
Stats
-
Feb 28, 2006
Grant Date -
Jul 15, 2004
app pub date -
Apr 30, 2002
filing date -
May 1, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Monitoring apparatus is for monitoring a parameter, such as a drive current to a motor. Motor current flows through a series resistor which provides a voltage signal which varies in response to variations in the motor current. An analysis circuit is operable to analyze the rate of change of the voltage and to provide an alarm signal in the event that the rate of change continues in excess of predetermined rate for a period in excess of a predetermined time. The alarm signal could, for example, be used to indicate that an automatic door being driven by the motor has been blocked by a person or object which could be injured or damaged.
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