US3575647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural motor servo drive system including mechanical differential summation and torque compensation
Assignee: Link Flight Simulation Corp
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Filing: 1968-09-05
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Granted: 1971-04-20
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Expires: 1988-09-05
Abstract
Abstract The disclosed embodiment of this invention is a servosystem for controlling the rotational position of a pair of anamorphic lenses in a perspective alteration optical system. A first servomechanism is connected to directly drive one of the anamorphic lenses and also to directly drive one input shaft of a differential coupling. A second servomechanism is connected to a second input shaft of the differential coupling. The other anamorphic lens is connected to and driven directly from the output shaft of the differential coupling. A signal proportional to the torque produced by the first servomechanism is supplied to the second servomechanism such that positional errors resulting from the inherent compliance of the second servomechanism are eliminated.
Inventors
- 👤 Kenneth Levy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:46
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/30; G09B9/32; G09B9/326; G05; G05D; G05D3/00; G05D3/12; G05D3/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
187 words
A system for displacing a pair of positionally related elements in accordance with two variables, said system comprising, in combination: a. first and second torque developing means, each responsive to a respective one of said variables; b. a differential coupling having inputs from each of said torque developing means; c. first coupling means between one of said elements and one of said torque developing means, whereby the former is positioned as a direct function of the output of the latter; d. second coupling means between the other of said elements and the output of said differential coupling, whereby the former is positioned as a function of both of said inputs to the latter; e. means for measuring the torque developed by the torque developing means developing the greater torque; and f. means for adding a component proportional to said measured torque to the variable to which the other of the torque developing means is responsive, thereby reducing the positional error of said other element resulting from transmission of torque through said differential coupling from the input having the greater torque to the input having the lesser torque.
Claim 2
Independent Claim
187 words
A system for displacing a pair of positionally related elements in accordance with two variables, said system comprising, in combination: a. first and second torque developing means, each responsive to a respective one of said variables; b. a differential coupling having inputs from each of said torque developing means; c. first coupling means between one of said elements and one of said torque developing means, whereby the former is positioned as a direct function of the output of the latter; d. second coupling means between the other of said elements and the output of said differential coupling, whereby the former is positioned as a function of both of said inputs to the latter; e. means for measuring the torque developed by the torque developing means developing the greater torque; and f. means for adding a component proportional to said measured torque to the variable to which the other of the torque developing means is responsive, thereby reducing the positional error of said other element resulting from transmission of torque through said differential coupling from the input having the greater torque to the input having the lesser torque.
Claim 3
Dependent Claim
17 words
The invention according to claim 1 wherein said torque developing means are servomechanisms and their respective servomotors.
Claim 4
Dependent Claim
26 words
The invention according to claim 2 wherein said means for measuring the torque comprise means for sensing the current in the servomotor developing the greater torque.
Claim 5
Dependent Claim
46 words
The invention according to claim 3 wherein one of said servomechanisms includes a synchro-resolver having as an input one of said variables, and a phase sensitive demodulator connected to an output of said synchro-resolver and having an output connected as an input to the respEctive servomotor.
Claim 6
Dependent Claim
27 words
The invention according to claim 4 wherein said synchro-resolver includes a rotor connected to the output of said servomotor and a stator inductively coupled to said rotor.
References Cited (Backward Citations)
US2796565A
Cited
US2801380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |