Back to results
US 7,804,224 B2Granted
Piezoelectric motor and piezoelectric motor system
AssigneeKabushiki Kaisha Toshiba
InventorsHiroshi Takahashi, Osamu Nishimura, Toshikatsu Akiba
Life of this patent
Estimating the term…
Abstract
A piezoelectric motor includes: a plurality of piezoelectric units, respectively in contact with a driven target, disposed separately from each other, and configured to drive the driven target; and a magnet configured to apply a preload force to each of the plurality of piezoelectric units by magnetically attracting the driven target in the absence of direct contact with the driven target.
Claims15
A piezoelectric motor, comprising:
- a plurality of piezoelectric units, respectively in contact with a driven target, disposed separately from each other, and configured to drive the driven target;
- and
- a magnet configured to apply a preload force to each of the plurality of piezoelectric units by magnetically attracting the driven target in the absence of direct contact with the driven target,
- wherein the piezoelectric units drive the driven target in two-degree-of-freedom directions,
- wherein each of the plurality of piezoelectric units comprises:
- first and second piezoelectric elements having oscillation directions diagonally intersecting with a driving direction of the driven target, respectively;
- and
- a drive part contacting the driven target, coupling with the first and second piezoelectric elements, and driving the driven target in a plane perpendicular to a driving plane of the driven target by synthesized oscillations of the first and second piezoelectric elements.
5 more elements
A piezoelectric motor, comprising:
- a plurality of piezoelectric units, respectively in contact with a driven target, disposed separately from each other, and configured to drive the driven target;
- and
- a magnet configured to apply a preload force to each of the plurality of piezoelectric units by magnetically attracting the driven target in the absence of direct contact with the driven target,
- wherein the piezoelectric units drive the driven target in three-degree-of-freedom directions, and
- wherein each of the piezoelectric units comprises:
- first to third piezoelectric elements having axes that have an intersection point intersecting with each other;
- and
- a drive part in contact with the driven target so as to couple with the first to third piezoelectric elements, and driving the driven target by synthesized oscillations of the first to third piezoelectric elements.
5 more elements
A piezoelectric motor system, comprising:
- a piezoelectric motor comprising:
- a plurality of piezoelectric units, respectively in contact with a driven target, disposed separately from each other, and configured to drive the driven target;
- wherein each of the plurality of piezoelectric units comprises:
- first and second piezoelectric elements having oscillation directions diagonally intersecting with a driving direction of the drive target, respectively;
- a magnet configured to apply a preload force to each of the plurality of piezoelectric units by magnetically attracting the driven target in the absence of direct contact with the driven target;
- a preload setting unit configured to set a value of the preload force to be applied to the piezoelectric motor by the magnet based on at least position information of the piezoelectric motor and order information for the piezoelectric unit;
- and
- an amplifier configured to apply a current value to the magnet corresponding to the value.
5 more elements
Dependencies are inferred from the claim text.