Patent US348858A successfully refreshed from Google Patents.
Patent US3934196A successfully refreshed from Google Patents.
US3934196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servoed indicating apparatus
Assignee: Boeing North American Inc
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Filing: 1973-11-15
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Granted: 1976-01-20
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Expires: 1993-11-15
Abstract
Abstract A torque motor incorporating a permanent magnet rotor and winding therewith for providing the indicating mechanism of a servoed indicating unit. The circuitry for use with the indicating mechanism first applies a reference feedback-producing pulse, then provides the signal for application of torque to the indicator to move it toward the desired position, and then has a quiescent period to clear the stator windings of the mechanism of currents before recommencing the voltage reference and torquing cycle.
Inventors
- 👤 Leon T. Gompert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:41
CPC Classifications
G; G01; G01R; G01R17/00; G01R17/02; G01R17/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
202 words
Apparatus for positioning an indicator pointer in closed loop servo fashion in accordance with a control signal comprising, in combination: prime movement means comprising a permanent magnet motor having a stator, a rotor, a control winding coupled with one of said stator and rotor, and a feedback winding coupled with the other of said stator and rotor; indicator pointer means attached to said rotor for use in displaying apparatus input signals; first means connected for, effectually, periodically initially applying a reference signal to said control winding and then applying a control error signal thereto for displacing the rotor in accordance with the error signal; second means including sample and hold means for sampling a feedback signal from said feedback winding during the application of a reference signal to said control winding and providing as an output a position signal for a predetermined time; apparatus input signal supplying means for supplying an input signal the value of which is to be displayed by said apparatus; and means connected to said first means, said second means and said apparatus input signal supplying means for supplying an error signal to said first means indicative of a comparison between the position signal and the input signal.
Claim 2
Dependent Claim
202 words
Apparatus for positioning an indicator pointer in closed loop servo fashion in accordance with a control signal comprising, in combination: prime movement means comprising a permanent magnet motor having a stator, a rotor, a control winding coupled with one of said stator and rotor, and a feedback winding coupled with the other of said stator and rotor; indicator pointer means attached to said rotor for use in displaying apparatus input signals; first means connected for, effectually, periodically initially applying a reference signal to said control winding and then applying a control error signal thereto for displacing the rotor in accordance with the error signal; second means including sample and hold means for sampling a feedback signal from said feedback winding during the application of a reference signal to said control winding and providing as an output a position signal for a predetermined time; apparatus input signal supplying means for supplying an input signal the value of which is to be displayed by said apparatus; and means connected to said first means, said second means and said apparatus input signal supplying means for supplying an error signal to said first means indicative of a comparison between the position signal and the input signal.
Claim 3
Dependent Claim
37 words
Apparatus as claimed in claim 1 wherein: said first means includes means for periodically disconnecting the application of all signals to said control winding for predetermined time periods immediately prior to application of the reference signal thereto.
Claim 4
Dependent Claim
27 words
Apparatus as claimed in claim 2 wherein: said second means includes circuitry for providing lead compensation in the position signal to initially over-emphasize the error signal generated.
Claim 5
Dependent Claim
155 words
Electromagnetic transducer apparatus comprising, in combination: permanent magnet motor means including stator means and rotor means; a stator winding coupled to said stator means and a further winding coupled to said rotor means, one of said windings being used for a reference signal input and the other for a pickoff signal output; means for applying a reference pulse to the appropriate winding; means for sampling the effects of the applied reference pulse as obtained from the pickoff signal winding to obtain an indication of position of said rotor means with respect to said stator means; means for applying an apparatus input signal, an indication of which is to be obtained; means for comparing the sampled pulse with the apparatus input signal to produce an error signal; and means for applying a signal indicative of the error signal to the appropriate winding for moving said rotor means toward a value indicative of the apparatus input signal.
Claim 6
Dependent Claim
155 words
Electromagnetic transducer apparatus comprising, in combination: permanent magnet motor means including stator means and rotor means; a stator winding coupled to said stator means and a further winding coupled to said rotor means, one of said windings being used for a reference signal input and the other for a pickoff signal output; means for applying a reference pulse to the appropriate winding; means for sampling the effects of the applied reference pulse as obtained from the pickoff signal winding to obtain an indication of position of said rotor means with respect to said stator means; means for applying an apparatus input signal, an indication of which is to be obtained; means for comparing the sampled pulse with the apparatus input signal to produce an error signal; and means for applying a signal indicative of the error signal to the appropriate winding for moving said rotor means toward a value indicative of the apparatus input signal.
References Cited (Backward Citations)
US3430141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |