Actuator for an ultrasonic motor and ultrasonic motor comprising at least one such actuator
US10063163B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 2013 |
| Grant date | Aug 28, 2018 |
| Priority date | — |
| Expiry date | Oct 10, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/007
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An ultrasonic motor comprising a rotor (18) having an at least partly spherical shape and two actuators (2, 2′) each comprising an element of plate-shaped piezoelectric material comprising at least one contact edge (4, 4′) in contact with the rotor (18), said actuators (2, 2′) also comprising on one of their faces electrodes intended to bias piezoelectric materials in a bending mode and in a longitudinal mode. The contact edges (4, 4′) are concave and are formed by an arc of circle the radius of which substantially corresponds to the radius of the surface of the rotor (18), said arcs of circle angularly extending at a determined angle such that the bending mode and the longitudinal mode in which the piezoelectric material is biased are at the same frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.