Ultrasonic motor unit
US5336958A · kind A · utility
7Cited by
12References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1993 |
| Grant date | Aug 9, 1994 |
| Priority date | — |
| Expiry date | Oct 19, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An ultrasonic motor unit comprises a stator having a piezoelectric member and an elastic member which is excited by the piezoelectric member to generate a travelling vibration wave, and a rotor which is press-contacted to the stator and driven by the travelling vibration wave. At least two sets of input electrodes each having two input electrodes are circumferentially arranged on the piezoelectric member. A drive voltage is applied to only the selected ones of the input electrodes in accordance with a drive power requirement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.