Ultrasonic motor having high drive efficiency
US5066884A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 1990 |
| Grant date | Nov 19, 1991 |
| Priority date | — |
| Expiry date | Feb 5, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/0085
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An ultrasonic motor has a stator having a piezoelectric member vibrated by a drive signal, and an elastic member for generating traveling vibration wave in a drive surface thereof upon vibration of the piezoelectric member, a rotor which is urged against the drive surface of the elastic member and is driven by the generated traveling vibration wave, a support member integrally molded on the elastic member, and a fixing member for holding the support member. In the ultrsonic motor, one end face of the support member is formed at the same level as the drive surface or the junction surface of the elastic member, an electrode of the piezoelectric member is grounded through the support member, a plurality of holes are regularly formed in the circumferential direction of the support member, or the support member is fixed to the fixing member by an adhesive, thereby improving drive efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.