Piezo-electric motor with piezo stack and spring strap
US11152873B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 2017 |
| Grant date | Oct 19, 2021 |
| Priority date | — |
| Expiry date | Feb 23, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/025
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A piezo-electric motor 100 includes an actuation portion including an actuation surface 106 and a piezo stack 102 that is operable in response to the application of a voltage to move the actuation surface along an actuation axis 116 between a retracted position and an extended position. A spring strap 112 partially surrounds the actuation portion and is operable to bias the actuation surface toward the retracted position and a movable portion 108,110 is frictionally engaged with the actuation surface. The voltage is selected such that the movable portion sticks to the actuation surface as the actuation surface moves toward one of the retracted position and the extended position and slips on the actuation surface as the actuation surface moves toward the other of the retracted position and the extended position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.