US3697992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo compensation for inertia change
Assignee: United States Department of the Navy
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Filing: 1970-07-09
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Granted: 1972-10-10
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Expires: 1990-07-09
Abstract
Abstract An improvement in the servo drive system as used in a missile director during the elevation function to compensate for changes in inertia. The secant potentiomenter and its associated circuitry is amended to compensate for inertia change as well as changes in elevation angle.
Inventors
- 👤 James A Kleptz
- 👤 George H Bissell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:16
CPC Classifications
F; F41; F41G; F41G5/00; F41G7/00; F41G7/20; F41G7/30; F41G7/301
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
164 words
A servo control system compensated for inertia change comprising: a movable platform as would be used for a missile director; a reversible motor for moving the platform; detection means for providing a signal indicative of platform movement; means for receiving the signals indicative of platform movement to produce rate orders; means including a gyro for providing a signal indicative of the rate of platform movement; a train servo for the train axis and an elevation servo for the elevation axis, both servos employing rate gyros as primary feedback elements; a secant potentiometer so that the train rate equals the traverse rate times the secant of the elevation angle of the line of sight to a target from the deck plane; a servo amplifier for receiving the rate orders and the signal from the rate means to derive a rate error signal by comparing the two; and a power amplifier connected to the servo amplifier for energizing the motor in accordance with the error signals.
Claim 2
Dependent Claim
164 words
A servo control system compensated for inertia change comprising: a movable platform as would be used for a missile director; a reversible motor for moving the platform; detection means for providing a signal indicative of platform movement; means for receiving the signals indicative of platform movement to produce rate orders; means including a gyro for providing a signal indicative of the rate of platform movement; a train servo for the train axis and an elevation servo for the elevation axis, both servos employing rate gyros as primary feedback elements; a secant potentiometer so that the train rate equals the traverse rate times the secant of the elevation angle of the line of sight to a target from the deck plane; a servo amplifier for receiving the rate orders and the signal from the rate means to derive a rate error signal by comparing the two; and a power amplifier connected to the servo amplifier for energizing the motor in accordance with the error signals.
Claim 3
Dependent Claim
12 words
The device of claim 1 wherein the detection means is a radar.
Claim 4
Dependent Claim
25 words
The device of claim 2 wherein the means for receiving signals indicative of platform movement to produce rate orders is a computer and data converter.
Claim 5
Dependent Claim
25 words
The device of claim 1 wherein the secant potentiometer has three sections, two of which perform the secant function and one performs a linear function.
Claim 6
Dependent Claim
23 words
The device of claim 4 wherein the linear function performed by the potentiometer is the train inertia compensation for changes with elevation angle.
Claim 7
Dependent Claim
23 words
The device of claim 5 wherein the train tolerance band is reduced by the use of a secant potentiometer compensated for inertia changes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |