Piezoelectric motors and motor driving configurations
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United States of America Patent
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-
Apr 3, 2007
Grant Date -
Jan 12, 2006
app pub date -
Sep 8, 2005
filing date -
Oct 31, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A piezoelectric motor comprising: a piezoelectric vibrator having an axis of symmetry and a first vibration mode, which when excited generates oscillatory motion of mass points in the vibrator parallel to the axis of symmetry; and at least one friction nub having a center of mass displaced from the axis of symmetry, as a result of which displacement, when the vibration mode is excited, torque is generated on the vibrator that excites a second vibration mode of the vibrator.
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