Linear motor door actuator
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United States of America Patent
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Dec 1, 2009
Grant Date -
Dec 6, 2007
app pub date -
May 30, 2006
filing date -
May 30, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention relates to an alternating current electrical motor having a first element with magnets of alternating polarities, and a second element with electrical conductor coils, the first and the second elements being mounted for relative motion to one another. A controller for the electrical motor comprising: a current source for energizing the coils with an alternating current to produce a movement of the first and the second elements relative to one another; a sensor for sensing a phase shift between the magnets and the current in the coils; and a current source controller for varying an amplitude of the current to substantially regulate the phase shift to an optimum phase shift value, thereby providing a minimum power consumption for proper operation of the electrical motor.
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