Wear-balanced electromagnetic motor control switching
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United States of America Patent
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Nov 27, 2018
Grant Date -
May 12, 2016
app pub date -
Aug 21, 2015
filing date -
Nov 6, 2014
priority date (Note) -
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Abstract
One embodiment describes a method that includes in a first switching operation of an electrical power switching system including three separately controllable single pole, single current-carrying path switching devices that provide three-phase power to a load, and control circuitry coupled to the switching devices to control closing and opening of the current-carrying paths, commanding at least one of the switching devices to open or close in advance of at least one other of the switching devices based upon a current zero-crossing or a predicted current zero-crossing of input three-phase power; and in subsequent switching operations alternating which of the three switching devices is closed or opened in advance of another of the switching devices.
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