Ultrasonic motor and ultrasonic motor control method
US5438229A · kind A · utility
13Cited by
9References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 8, 1994 |
| Grant date | Aug 1, 1995 |
| Priority date | — |
| Expiry date | Feb 8, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An ultrasonic motor comprising vibrating body, piezoelectric body for exciting an elastic travelling wave in the vibrating body and moving body driven by the elastic travelling wave provides plural vibration amplitude detection electrodes for detecting an amplitude of vibration of the vibrating body these output signals from which are utilized to identify the magnitude of vibration amplitude of the vibrating body and the ultrasonic motor is controlled using the magnitude of vibration amplitude as a control index.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.