Electricity: motive power systems – Positional servo systems – With stabilizing features
Patent
1983-02-03
1985-05-14
Dobeck, B.
Electricity: motive power systems
Positional servo systems
With stabilizing features
310 77, 310 93, 335100, G05B 501
Patent
active
045175055
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 displacement detector (29) and correction module (28) to control a servo (27). The servo (27) can drive the support plate (15) through various means such as gears, drive wheels or the like.
REFERENCES:
patent: 2353618 (1944-07-01), Lamb
patent: 3099094 (1963-07-01), Ehrich et al.
patent: 3277357 (1966-10-01), Willis
patent: 3699369 (1972-10-01), Hlipala
patent: 4142610 (1979-03-01), Alexander
patent: 4390260 (1983-06-01), Prinz
patent: 4398111 (1983-08-01), Zuch
Dobeck B.
Mackin James A.
Manning John R.
Musial Norman T.
The United States of America as represented by the Administrator
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