Electronically controlled switch for an electric motor
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United States of America Patent
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Aug 14, 2018
Grant Date -
May 18, 2017
app pub date -
Jan 12, 2017
filing date -
Jun 30, 2014
priority date (Note) -
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Abstract
A system in which the operation of an electric motor is controlled by electronically controlled switches. The system includes the motor having a run winding and a start winding, a heating component, and a motor control subsystem. A control unit closes a first switch to energize the run winding, closes a second switch to energize the start winding, determines based on an amplitude and a lag time of a current flowing through the motor whether the motor has started and is running normally, and if so, opens the second switch to de-energize the start winding and closes a third switch to activate the heating component. The control unit determines whether the motor has started and is running normally by comparing the real time amplitude and lag time of the current to a plurality of stored amplitudes and lag times associated with different operating conditions.
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