No load motor cutoff method and apparatus
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United States of America Patent
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N/A
Issued Date -
Mar 16, 2006
app pub date -
Sep 10, 2004
filing date -
Sep 10, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A motor is shut off when its operation encounters no load conditions, e.g. low water conditions for a submersible pump motor. The shutoff signal is obtained from the motor frequency and motor power. When motor frequency exceeds the rated frequency and motor power drops to a preselected level below rated power, a shutoff signal is produced. The motor can be kept off for a preselected period of time before attempting to restart.
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