Power control for induction motors using variable frequency AC power
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United States of America Patent
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Apr 13, 2010
Grant Date -
Mar 27, 2008
app pub date -
Sep 26, 2006
filing date -
Sep 26, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
An autonomous controller allows an AC induction motor to operate over a broad range of AC power supply frequencies by reducing the amount of current supplied to the motor at lower frequencies. The controller detects the frequency of the power supply and switches the supply current on and off during each AC cycle to limit the RMS current to a value that is related to the detected frequency. Alternatively, the controller switches capacitive reactance into the power supply circuit which reduces the current supplied to the motor at lower AC frequencies.
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