Reduced-voltage, linear motor systems and methods thereof
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United States of America Patent
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Jul 10, 2012
Grant Date -
Feb 18, 2010
app pub date -
Aug 18, 2008
filing date -
Aug 18, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A linear motor system includes an element with a threaded passage, a threaded shaft, and a driving system. The threaded shaft has an axis of rotation which extends through and is at least partially engaged with at least a portion of the threaded passage. The driving system comprises at least two members operatively connected to the element. Each of the two members comprises two or more piezoelectric layers and electrodes which are coupled to opposing surfaces of each of the piezoelectric layers. The members are configured to expand and contract in a direction along the axis of rotation. The driving system is configured to subject the element to vibrations causing the threaded shaft to simultaneously rotate and translate in the direction along the axis of rotation through the element and apply an axial force in the direction along the axis of rotation.
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