Piezoelectric motor with high torque
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United States of America Patent
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May 22, 2012
Grant Date -
Jun 17, 2010
app pub date -
Dec 16, 2009
filing date -
Dec 17, 2008
priority date (Note) -
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Abstract
A piezoelectric motor (100) includes a stator (2) having a stator shaft (9). The motor also includes an annular piezoelement (4) having upper and lower surfaces and inner and outer rims retained on the stator. The motor further includes an annular wave shell (6) on an outer rim of the piezoelement and a rotor coupled to the stator shaft, where the rotor has a rotor inner circumferential surface (20). The motor additionally includes elastic pushers (8), each having an end coupled to the wave shell and another end extending to and contacting the rotor inner circumferential surface. In the motor, a radius of the outer rim is at least twice the radius of the inner rim and an annular width of the piezoelement is at least twice its thickness.
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