Patent US3757190A successfully refreshed from Google Patents.
US3757190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slip ring electrical connections
Assignee: Thales Communications Ltd
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Filing: 1972-02-18
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Granted: 1973-09-04
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Expires: 1992-02-18
Abstract
Abstract A slip-ring servo arrangement for overcoming the friction of electrical slip-ring and brush rotating connections. In such an arrangement with fixed brushes and rotatable slip rings providing electrical connections to a servo motor driven rotor, the slip rings are separately mounted and separately servo motor driven, according to the same demand signal as the rotor, and the slip ring-to-rotor electrical connections are flexible to permit of limited rotational displacement between the rotor and the slip rings.
Inventors
- 👤 M Shelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:02
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
A device comprising a stationary part and a first rotatable part connected by electrical connecting members comprising slip rings and associated brushes, one of said electrical connecting members being mounted on a second rotatable part coaxial with the said first rotatable part, said first and second rotatable parts being interconnected by flexible electrical connections permitting limited rotational displacement therebetween, the first and second rotatable parts being separately rotated by first and second servo motor means, said first and second servo motor means respectively including first and second servo motors and both said servo motors being driven by a common angular demand signal, the first and second rotatable parts driving first and second angular position measuring devices, respectively, the first and second servo motors being driven to minimize the rotational error between the common angular demand signal and the measured angular position of the first and second rotatable parts, respectively.
Claim 2
Independent Claim
149 words
A device comprising a stationary part and a first rotatable part connected by electrical connecting members comprising slip rings and associated brushes, one of said electrical connecting members being mounted on a second rotatable part coaxial with the said first rotatable part, said first and second rotatable parts being interconnected by flexible electrical connections permitting limited rotational displacement therebetween, the first and second rotatable parts being separately rotated by first and second servo motor means, said first and second servo motor means respectively including first and second servo motors and both said servo motors being driven by a common angular demand signal, the first and second rotatable parts driving first and second angular position measuring devices, respectively, the first and second servo motors being driven to minimize the rotational error between the common angular demand signal and the measured angular position of the first and second rotatable parts, respectively.
Claim 3
Dependent Claim
37 words
A device as claimed in claim 1, having stationary brushes and having the slip rings assembled into a unitary structure so that all the slip rings are mounted together and rotated together with the second rotatable part.
Claim 4
Dependent Claim
78 words
A device as claimed in claim 1 in which the servo motor means for minimizing the rotational error between the common angular demand signal and the measured angular position of the first and second rotatable parts comprise, respectively, first and second servo amplifiers controlling the first and second servo motors, respectively, and fed both with the common angular demand signal and each with an angular position signal derived from the first and second angular position measuring devices, respectively.
Claim 5
Dependent Claim
71 words
An optical system having a lens defining an optical axis and an optical element which is driven in azimuth around the optical axis, including a device as claimed in claim 1, wherein the said optical element is mounted on the first rotatable part, the first and second rotatable parts and the slip rings are all coaxial with the optical axis and the first servo motor is an azimuth position servo motor.
Claim 6
Dependent Claim
41 words
An optical system as claimed in claim 4 including an adjustable iris arranged on the optical axis and driven by a third servo motor mounted on the first rotatable part, and supplied by way of the slip rings and associated brushes.
Claim 7
Dependent Claim
52 words
An optical system as claimed in claim 4, in which the optical element is a pitch prism driven in azimuth according to the first rotatable part and driven in pitch by a fourth servo motor mounted on the first rotatable part and supplied by way of the slip rings and associated brushes.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |