Control apparatus and program
US7116033B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2004 |
| Grant date | Oct 3, 2006 |
| Priority date | — |
| Expiry date | Nov 12, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/142
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
When starting a vibration-type drive device, the frequency of a drive signal is lowered from a predetermined frequency at a first change rate. When the vibration state of a vibration member reaches a predetermined state, it is determined whether or not a relative movement speed has reached a reference speed. When the relative movement speed has not reached the reference speed, the frequency of the drive signal is lowered at a second change rate that is smaller than the first change rate. This avoids problems which could occur when moisture intervenes on a slide surface of the vibration-type drive device, such as the vibration-type drive device not starting, and a desired rpm not being achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.