Varible force, eddy-current or magnetic damper
US4517505A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 3, 1983 |
| Grant date | May 14, 1985 |
| Priority date | — |
| Expiry date | Feb 3, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2360/00
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An object of the invention is to provide variable damping for resonant vibrations which may occur at different rotational speeds in the range of rpms in which a rotating machine is operated. A variable force damper in accordance with the invention includes a rotating mass (12) carried on a shaft (11) which is supported by a bearing (13) in a resilient cage (14). Cage (14) is attached to a support plate (15) whose rim extends into an annular groove in a housing (17). Variable damping is effected by tabs (18) of electrically conducting, non-magnetic material which extend radially from the cage (14). The tabs (18) at an index position lie between the pole faces of respective C-shaped magnets (19). The magnets (19) are attached by cantilever spring members (20) to the housing (17). By rotating the support plate (15) about the axis of shaft (11), the tabs (18) may be rotated through an angle 0 of about 40.degree. away from the index or 0.degree. position. At the 40.degree. position minimum damping is obtained. To position support plate (15) to achieve a desired amount of damping, means for generating an electrical signal indicative of the vibrating displacement of shaft (11) such as dis…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.