Piezoelectric revolving resonator and single-phase ultrasonic motor
US5008581A · kind A · utility
25Cited by
7References
6Claims
0Family size
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Key dates
| Filing date | Apr 10, 1989 |
| Grant date | Apr 16, 1991 |
| Priority date | — |
| Expiry date | Apr 10, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/103
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A piezoelectric revolving resonator is disclosed in which a piezoelectric ceramic material in the form of a disk, a cylinder or a pipe is polarized so that two regions divided by its diameter are different in polarity from each other, and electrodes are provided to form equipotential surfaces on opposite principal surfaces and a resonant condition in which piezoelectric deformations are revolved is excited by a single-phase alternating current voltage. Due to the single-phase drive, the structures of the resonator and the drive circuit can be simplified.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.