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Patent US3694716A successfully refreshed from Google Patents.
US3694716A
Expired / Lapsed
US
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Gyromotor synchronization system
Assignee: Kearfott Guidance and Navigation Corp
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Filing: 1970-08-14
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Granted: 1972-09-26
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Expires: 1990-08-14
Abstract
Abstract In a system employing gyroscopes driven by AC motors at synchronous speeds the motors are controlled so that their rotors always occupy the same synchronous position with respect to the rotating magnetic fields in the motors. This control, which makes the drift of the gyroscope due to rotor unbalance constant, is achieved by generating a rotor marker pulse each time the rotor passes through a predetermined angular position and causing the rotor to be positioned so that this pulse occurs at a preselected point in the cycle of energization of the AC motor.
Inventors
- 👤 Paul D Eland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:21
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/02; G01C19/04; H; H02; H02P; H02P5/00; H02P5/46; H02P5/50; H02P5/51
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
252 words
A gyroscope energization system comprising a gyro, an AC motor connected to drive said gyro, an AC source for energizing said motor with AC power producing a cyclical Field for driving the rotor of said motor at synchronous speed said rotor having a plurality of possible synchronous positions with respect to said cyclical field when driven at synchronous speed, and comparison means to detect whether said rotor occupies a predetermined one of said plurality of synchronous positions with respect to said cyclical field wherein said AC source includes, a clock frequency source, frequency divider means serially connected to said clock source, said divider means adapted to provide a first AC signal, power source means serially connected to said divider means, said power source means adapted to output a second AC signal for energizing said motor, and wherein said comparison means includes, generator means adapted to receive said first AC signal, said generator means adapted to provide a first pulse and a second pulse, each said first pulse and second pulse being in synchronism with said second AC signal, and wherein said comparison means further includes rotor marker means, said rotor marker means adapted to provide a third pulse for indicating the position of said rotor, and wherein said comparison means further includes digital logic means for comparing the time relationship between the third pulse and the first and second pulses so as to produce an output control signal only when said third pulse falls between said first pulse and said second pulse.
Claim 2
Dependent Claim
252 words
A gyroscope energization system comprising a gyro, an AC motor connected to drive said gyro, an AC source for energizing said motor with AC power producing a cyclical Field for driving the rotor of said motor at synchronous speed said rotor having a plurality of possible synchronous positions with respect to said cyclical field when driven at synchronous speed, and comparison means to detect whether said rotor occupies a predetermined one of said plurality of synchronous positions with respect to said cyclical field wherein said AC source includes, a clock frequency source, frequency divider means serially connected to said clock source, said divider means adapted to provide a first AC signal, power source means serially connected to said divider means, said power source means adapted to output a second AC signal for energizing said motor, and wherein said comparison means includes, generator means adapted to receive said first AC signal, said generator means adapted to provide a first pulse and a second pulse, each said first pulse and second pulse being in synchronism with said second AC signal, and wherein said comparison means further includes rotor marker means, said rotor marker means adapted to provide a third pulse for indicating the position of said rotor, and wherein said comparison means further includes digital logic means for comparing the time relationship between the third pulse and the first and second pulses so as to produce an output control signal only when said third pulse falls between said first pulse and said second pulse.
Claim 3
Dependent Claim
57 words
A gyroscope energization system as recited in claim 1, wherein said comparison means further includes automatic means responsive to said control signal for automatically positioning said rotor such that said third pulse falls between said first pulse and said second pulse, and wherein said comparison means further includes gate means selectively operable to disable said automatic means.
Claim 4
Dependent Claim
41 words
A gyroscope energization system as recited in claim 2 wherein said generator means includes a counter device arranged such that the time between said first pulse and second pulse is less than one-eighth of each cycle of said second AC signal.
Claim 5
Dependent Claim
36 words
A gyroscope energization system as recited in claim 3 wherein said power source means further includes switch means for momentarily interrupting said second AC signal from energizing said motor upon command from said digital logic means.
Claim 6
Dependent Claim
46 words
A gyroscope energization system as recited in claim 4 wherein said digital logic means includes a first flip flop serially connected to a pair of logic devices, said devices serially connected to a second flip flop, said second flip flop serially connected to said gate means.
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |