US3778122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for contact-free, axially stabilized and radially centered positioning of a rotating shaft, particularly of an operating machine for low temperatures
Assignee: Individual
•
Filing: 1972-07-19
•
Granted: 1973-12-11
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Expires: 1992-07-19
Abstract
Abstract A system for contact-free, axially stabilized and radially centered positioning of a rotating shaft, particularly of an operating machine for low temperatures.
Inventors
- 👤 R Doll
- 👤 H Berndt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:40
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
121 words
A contact-free, axially stabilized and radially centered positioning system of a rotating shaft, particularly of an operating machine for low temperatures, comprising radially centered bearings associated with each shaft end operated by magnetic forces, and an electro-magnetic servo-mechanism for axial stabilization whose electro-magnetic system acting axially on the shaft is controlled by a tracer system for the position of the shaft characterized by the fact that each radially centered bearing is provided with at least one annular cutting blade (5) concentric to the shaft (1) made of ferro-magnetic material, and with a stationary annular blade (7) of ferro-magnetic material placed opposite at a small gap, and that both annular blades are located in the magnetic circuit of a stationary magnet (8).
Claim 2
Dependent Claim
121 words
A contact-free, axially stabilized and radially centered positioning system of a rotating shaft, particularly of an operating machine for low temperatures, comprising radially centered bearings associated with each shaft end operated by magnetic forces, and an electro-magnetic servo-mechanism for axial stabilization whose electro-magnetic system acting axially on the shaft is controlled by a tracer system for the position of the shaft characterized by the fact that each radially centered bearing is provided with at least one annular cutting blade (5) concentric to the shaft (1) made of ferro-magnetic material, and with a stationary annular blade (7) of ferro-magnetic material placed opposite at a small gap, and that both annular blades are located in the magnetic circuit of a stationary magnet (8).
Claim 3
Dependent Claim
68 words
A positioning system, especially according to claim 1, characterized by the fact that to avoid movements of precession of the shaft a tracer-controlled electro-magnetic system (30) exerts a radial force on the shaft (1), that the tracer system (16,17,18) responds also to radial Deflections of the shaft and that the exerted radial effect of force of the electro-magnetic system, is coordinated in position to the determined radial deflection.
Claim 4
Dependent Claim
54 words
A positioning system particularly according to claim 1, characterized in that in order to avoid rolling movements of the shaft at a given attenuation the non-rotating parts of the positioning system are held firmly elastically and the inherent frequency of the elastic holding means is tuned to the inherent frequency of the rolling movement.
Claim 5
Dependent Claim
28 words
A positioning system according to claim 1, characterized by the fact that the stationary annular cutting edge (7) is designed as a polar leg of the magnet (8).
Claim 6
Dependent Claim
34 words
A positioning system according to claim 1, characterized by the fact that the annular blade (5) connected to the shaft end (4) forms an air gap with another polar leg (9) of the magnet.
Claim 7
Dependent Claim
42 words
A positioning system according to claim 5, characterized by the fact that the gap (b) between the opposite annular blades (5, 7) is smaller than gap (a) between the mobile annular blade (5) and the associated polar leg (9) of the magnet.
Claim 8
Dependent Claim
25 words
A positioning system according to claim 5, characterized in that the magnet (8) is an axially magnetized permanent magnet concentrically surrounding a shaft end (4).
Claim 9
Dependent Claim
69 words
A positioning system according to claim 2, characterized in that the electro-magnetic system (30) embraces a flange (12) fixed to the shaft (1) perpendicular to the axis of the shaft, and a coil annularly surrounding the shaft, with an annular iron core of U-shaped cross-section, and the plane (x - x) of the pole shoe ends (14,15) facing the shaft flange extends obliquely to the axis of the shaft.
Claim 10
Dependent Claim
44 words
A positioning system according to claim 8, characterized in that the tracer system (16,17,18) for holding the radial deflection and axial displacement of shaft (1) is a photo-electric tracer system whose cluster of light beams traverses the annular gap (b) between opposite annular blades.
Claim 11
Dependent Claim
39 words
A positioning system according to claim 9, characterized in that the photo-electric cell (18) of the tracer system is connected to a PD control system (20), to which the coil of the electro-magnet (13) to be controlled is connected.
Claim 12
Dependent Claim
34 words
A positioning system according to claim 4, characterized by the fact that the annular blade (5) connected to the shaft end (4) forms an air gap with another polar leg (9) of the magnet.
Claim 13
Dependent Claim
25 words
A positioning system according to claim 6, characterized in that the magnet (8) is an axially magnetized permanent magnet concentrically surrounding a shaft end (4).
References Cited (Backward Citations)
US3110481A
Cited
US3243238A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |