System and method for saving energy when driving masses having periodic load variations
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United States of America Patent
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-
Jan 19, 2016
Grant Date -
Jun 26, 2014
app pub date -
Feb 27, 2014
filing date -
Sep 8, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A system and method are described for conserving energy by decoupling a supply voltage to an electric motor operating under periodic load variations. A time segment value corresponding to a duration of periodic load variations is obtained and the supply voltage is adjusted to maintain an observed phase angle for a supply voltage and current at a value corresponding to a target phase angle. At least one off-time period is identified during the time segment value that corresponds to when the adjusted supply voltage is applied to the motor. During a remainder of the time segment value, at least one turn-on time period is provided when the supply voltage is coupled to the motor. The system may enter to a closed-loop control process after a predetermined period of time to adjust to any changes in the periodic load variations.
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