Ultrasonic driven type motor
US4885499A · kind A · utility
16Cited by
6References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1989 |
| Grant date | Dec 5, 1989 |
| Priority date | — |
| Expiry date | Feb 10, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/106
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An ultrasonic driven type motor in which an ultrasonic torsional vibrator is activated to generate a forward turning torque for driving a rotor synchronously with the expansion of at least one piezoelectric actuator provided between the vibrator and the rotor, and to generate a return turning torque synchronously with the constriction of the piezoelectric actuator, and the piezoelectric actuator has a coupling control characteristic so that only the forward turning torque is selectively transmitted to the rotor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.