Ultrasonic motor
US6366004B1 · kind B1 · utility
7Cited by
6References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 21, 2000 |
| Grant date | Apr 2, 2002 |
| Priority date | — |
| Expiry date | Apr 21, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/106
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An ultrasonic motor includes a stator and a rotor. The stator has piezoelectric elements. When an alternating current having a predetermined frequency is applied to the piezoelectric elements, the elements axially vibrate. The stator axially vibrates in response to the axial vibration of the piezoelectric elements. The rotor includes projections arranged about its axis. The projections contact the stator. Each projection is designed and formed such that it torsionally vibrates independently in response to the axial vibration of the stator. As a result, a compact and high torque motor is produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.