Drive device using electromechanical transducer
US6051909A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1997 |
| Grant date | Apr 18, 2000 |
| Priority date | — |
| Expiry date | Dec 23, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02N2/025
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A drive device using an electromechanical transducer having inconsiderable loss of drive energy and excellent drive efficiency even with variation in load in which an elastic member is arranged between a driven member frictionally coupled to a drive member and a frictional member fitted to an opening of the driven member whereby drive force is transmitted from the drive member to the driven member with no loss of energy, a frictional force between the drive member and the driven member is periodically changed, an average frictional force is increased when a shift between a phase of variation in a drive velocity and a phase of variation in the frictional force is null, when the shift between the phases is 180.degree., the average frictional force is adjusted to decrease whereby the drive efficiency can be promoted, and when the device is stopped, the drive device can be protected against unintentional external force bringing the drive member and the driven member into fixing contact with each other by an electromechanical transducer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.