Motor overload indicating arrangement
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United States of America Patent
Stats
-
Sep 29, 1992
Grant Date -
N/A
app pub date -
Aug 12, 1991
filing date -
Aug 12, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An arrangement for detecting a motor overload condition by examining the phase angle relationship between the motor voltage and current. As the load increases, the phase angle difference approaches zero. By measuring the zero crossings of the voltage and current and providing a signal representative of the time difference between these crossings, the phase angle relationship is determined and, accordingly, so is the motor load. Specifically, a saturable ferromagnetic core is utilized to detect the current zero crossings.
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