Reduced voltage soft starter apparatus and methods using current-controlled transitions
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United States of America Patent
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Sep 21, 2021
Grant Date -
N/A
app pub date -
Aug 13, 2020
filing date -
Aug 13, 2020
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A motor starter includes a plurality of semiconductor switches configured to couple respective phases of an AC power source to respective phases of a motor and a control circuit configured to configured to selectively operate the semiconductor switches to gradually increase a voltage applied to the motor, to determine root mean square (RMS) current values of a current of the motor as the voltage increases, and to cause the semiconductor switches to apply a full voltage or a more steeply ramping voltage to the motor responsive to the RMS current values meeting a criterion.
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