Drive control apparatus
US5038894A · kind A · utility
8Cited by
5References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1989 |
| Grant date | Aug 13, 1991 |
| Priority date | — |
| Expiry date | Oct 27, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B21/065
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A drive control apparatus includes a magnetic field in which a magnetic field gradient is provided by applying a magnetic field to the magnetic fluid to produce an apparent specific gravity gradient in accordance with the magnetic field gradient. A control member immersed in the magnetic fluid moves under the influence of buoyant force from a gradient of the apparent specific gravity produced in accordance with the magnetic field gradient, so that a driven body interlocking with the control member is driven at a low noise level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.