Ultrasonic motors
US6664712B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2001 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | Nov 7, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/0065
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An ultrasonic motor is described which uses radial vibrations of an electro-active material disc (7) amplified by one or more flextensional diaphragms (6) to drive a rotor (4) pressed in frictional contact with the diaphragm (6) by a force imposed by a spring (3) or magentic attraction. The vibrations are converted by elastic fins (5) into rotary motion of the rotor (4). The motor can be operated in any resonant mode that generates vibration at the surface perpendicular to the contact area. Versions of the motor with one or two rotors are disclosed with the two rotor version being used to produce an output in the same direction or opposite directions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.