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US 6,552,470 B2Granted
Piezoelectric motor
AssigneeSagem SA
InventorFrancois Hodar
Life of this patent
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Abstract
The invention relates to a piezoelectric motor having a rotor and supply means (S0, S1) for supplying an electrical control voltage to at least one piezoelectric element (9) of the stator. According to the invention, the supply means (S0, S1) are arranged to supply an electrical control voltage having a DC component (V0) for shifting towards the expansion state of the piezoelectric elements (9).
Claims14
A piezoelectric motor comprising:
- a rotor having at least one disc rotating about an axis;
- a voltage supply source operably supplying an electric control voltage;
- a clutch member;
- at least one piezoelectric element;
- and
- a stator having at least one member operably driving the disc in rotation, the drive member being operably applied in a normal direction against the surface of the disc by the clutch member, and being movable in a tangential drive direction by the deformation of the piezoelectric element which is deformable while being subjected to a variation in the electrical control voltage;
- wherein the voltage supply source is arranged to supply an electrical control voltage having a DC component of shifting towards the expansion state of the piezoelectric element in the tangential direction.
4 more elements
Dependencies are inferred from the claim text.