US3633088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Limit stop servocontrol system
Assignee: RTX Corp
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Filing: 1971-03-17
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Granted: 1972-01-04
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Expires: 1991-03-17
Abstract
Abstract Unidirectional feedback around a servoamplifier clamps the gain of the amplifier when the position feedback potential indicates the approaching of a stop. The clamping is in response to an amplifier output potential of a polarity that drives the servoed device into the stop, and is inoperative when the amplifier is of a polarity to drive the servoed device away from the stop. Full gain is therefore available when driving away from the stop. Increased accuracy is achieved, eliminating all position loop errors, by utilizing position feedback potential as a summing potential to control the operation of the clamping loop.
Inventors
- 👤 Bertram F Kupersmith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:45
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1418; G05D3/1427; G05B; G05B2219/00; G05B2219/30; G05B2219/49; G05B2219/49382
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
349 words
A servoamplifier system adapted to drive a servoed device toward and away from at least one limit stop in response to a desired position reference input signal and an actual position feedback signal indicative of the position of the servoed device, said system adapted to limit the output signal of an amplifier in the amplifier system as the servoed device approaches the stop, yet not limit the output signal of the amplifier when driving the servoed device away from the stop, said system comprising: an amplifier circuit having an input and an output out of phase with said input; a summing network connected to said input; a servoed device driven in response to the output signal of said amplifier circuit and having at least one position limit stop; means connected to said summing network for providing a desired position reference signal thereto; position feedback signal means controlled by said servoed device to develop an actual position feedback signal indicative of the actual position of said servoed device; means responsive to said position feedback signal means and connected to said summing network for coupling said actual position feedback signal thereto; limit means responsive to said position feedback signal means for developing a limit stop signal indicative of the relative position of said servoed device with respect to said limit stop; and limit stop feedback means connected directly between said output and said summing network, said limit stop feedback means having an operative state and a nonoperative statE, said limit stop feedback means when in its operative state providing unilateral conduction between said amplifier circuit output and said input summing network, thereby to clamp said amplifier circuit with negative feedback, said limit stop feedback means poled so as to conduct output signals from said output to said summing network only of a polarity tending to drive said servoed device toward said limit stop, and not of a polarity tending to drive said servoed device away from said limit stop, said limit stop feedback means connected to said limit means and rendered operative by a limit stop signal of a given magnitude.
Claim 2
Dependent Claim
349 words
A servoamplifier system adapted to drive a servoed device toward and away from at least one limit stop in response to a desired position reference input signal and an actual position feedback signal indicative of the position of the servoed device, said system adapted to limit the output signal of an amplifier in the amplifier system as the servoed device approaches the stop, yet not limit the output signal of the amplifier when driving the servoed device away from the stop, said system comprising: an amplifier circuit having an input and an output out of phase with said input; a summing network connected to said input; a servoed device driven in response to the output signal of said amplifier circuit and having at least one position limit stop; means connected to said summing network for providing a desired position reference signal thereto; position feedback signal means controlled by said servoed device to develop an actual position feedback signal indicative of the actual position of said servoed device; means responsive to said position feedback signal means and connected to said summing network for coupling said actual position feedback signal thereto; limit means responsive to said position feedback signal means for developing a limit stop signal indicative of the relative position of said servoed device with respect to said limit stop; and limit stop feedback means connected directly between said output and said summing network, said limit stop feedback means having an operative state and a nonoperative statE, said limit stop feedback means when in its operative state providing unilateral conduction between said amplifier circuit output and said input summing network, thereby to clamp said amplifier circuit with negative feedback, said limit stop feedback means poled so as to conduct output signals from said output to said summing network only of a polarity tending to drive said servoed device toward said limit stop, and not of a polarity tending to drive said servoed device away from said limit stop, said limit stop feedback means connected to said limit means and rendered operative by a limit stop signal of a given magnitude.
Claim 3
Dependent Claim
191 words
The servoamplifier system according to claim 1 wherein said servoed device has a second limit stop, and additionally comprising: second limit means responsive to said position feedback signal means for developing a second limit stop signal indicative of the relative position of said servoed device with respect to said second limit stop; and second limit stop feedback means connected directly between said output and said summing network, said second limit stop feedback means having an operative state and a nonoperative state, said second limit stop feedback means, when in its operative state providing unilateral conduction between said amplifier circuit output and said input summing network, thereby to clamp said amplifier circuit with negative feedback, said second limit stop feedback means poled so as to conduct output signals from said output to said summing network only of a polarity tending to drive said servoed device toward said second limit stop, and not of a polarity tending to drive said servoed device away from said second limit stop, said second limit stop feedback means connected to said second limit means and rendered operative by a second limit stop signal of a given magnitude.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |