Ultrasonic vibration motor and method for performing coarse and fine movements
US5783899A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 6, 1997 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | Jun 6, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/026
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An ultrasonic motor having a linear elastic body which contacts a relative movement member, piezo-electric elements which are joined to the elastic body, and a first waveform generator which repeatedly generates drive signals that have a first waveform part in which the drive voltage changes slowly on the piezo-electric elements and a second waveform part in which the drive voltage changes rapidly. The ultrasonic motor further has a second waveform generator which produces elliptical movement that is generated by the combined vibrations of longitudinal vibration and flex vibration on the elastic body based on applying sine waves having differing phases to specific locations of the piezo-electric elements and a controller which selectively switches the outputs of the first and second waveform generators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.