Patent US4339703A successfully refreshed from Google Patents.
US4339703A
Expired / Lapsed
US
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Two step phase reset gyro motor power supply
Assignee: Kearfott Guidance and Navigation Corp
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Filing: 1980-09-03
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Granted: 1982-07-13
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Expires: 2000-09-03
Abstract
Abstract A gyro motor supply provides an alternating signal to a gyro hysterisis motor. A detector senses the passage of a reference point on the gyro flywheel during each revolution thereof. A logic circuit is driven by the detector output and controls the phase of the alternating signal thereby ensuring a repeatable gyro start-up condition wherein the phasing is fixed between the reference point on the flywheel and a vector of the rotating field of the motor.
Inventors
- 👤 William J. Rolff
- 👤 Samuel Costa
- 👤 William A. Hendricks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:00
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/18; H02P23/186
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
170 words
A phase control system for a gyro synchronous motor comprising: means for detecting cyclical rotation of a reference point on a gyro flywheel and generating a position pulse in response to each rotational cycle; power supply means for a gyro synchronous motor; means for connecting the output of the power supply means to a synchronous gyro motor; and logic circuit means connected at its input to the detecting means at its output to an input of the supply means for providing a first reset pulse to the supply means which establishes a predetermined phase between the flywheel reference point and a vector of the synchronous motor rotating field; wherein signal delaying means are included in the logic circuit means for generating a second reset pulse delayed with respect to the first reset pulse for causing an additional phase shift of a preselected amount to occur thereby ensuring that the total phase shift exceeds a lag angle of the motor which might otherwise create uncertainty of data collected from a gyro.
Claim 2
Dependent Claim
170 words
A phase control system for a gyro synchronous motor comprising: means for detecting cyclical rotation of a reference point on a gyro flywheel and generating a position pulse in response to each rotational cycle; power supply means for a gyro synchronous motor; means for connecting the output of the power supply means to a synchronous gyro motor; and logic circuit means connected at its input to the detecting means at its output to an input of the supply means for providing a first reset pulse to the supply means which establishes a predetermined phase between the flywheel reference point and a vector of the synchronous motor rotating field; wherein signal delaying means are included in the logic circuit means for generating a second reset pulse delayed with respect to the first reset pulse for causing an additional phase shift of a preselected amount to occur thereby ensuring that the total phase shift exceeds a lag angle of the motor which might otherwise create uncertainty of data collected from a gyro.
Claim 3
Independent Claim
174 words
A system for resetting gyro motor phase comprising: a gyro which includes a flywheel rotated by a synchronous motor; means for detecting periodic rotation of a reference point on the flywheel and generating a position pulse in respect to each rotational cycle; power supply means for the gyro motor; means connecting the output of the power supply means to the gyro motor; and logic circuit means connected at its input to the detecting means at its output to an input of the supply means for providing a first reset pulse to the motor supply which establishes a predetermined phase between the flywheel reference point and a vector of the motor rotating field; wherein signal delaying means are included in the logic circuit means for generating a second reset pulse delayed with respect to the first reset pulse for causing an additional phase shift of a preselected amount to occur thereby ensuring that the total phase shift exceeds a lag angle of the motor which might otherwise create uncertainty of data collected from a gyro.
Claim 4
Independent Claim
174 words
A system for resetting gyro motor phase comprising: a gyro which includes a flywheel rotated by a synchronous motor; means for detecting periodic rotation of a reference point on the flywheel and generating a position pulse in respect to each rotational cycle; power supply means for the gyro motor; means connecting the output of the power supply means to the gyro motor; and logic circuit means connected at its input to the detecting means at its output to an input of the supply means for providing a first reset pulse to the motor supply which establishes a predetermined phase between the flywheel reference point and a vector of the motor rotating field; wherein signal delaying means are included in the logic circuit means for generating a second reset pulse delayed with respect to the first reset pulse for causing an additional phase shift of a preselected amount to occur thereby ensuring that the total phase shift exceeds a lag angle of the motor which might otherwise create uncertainty of data collected from a gyro.
Claim 5
Independent Claim
193 words
A system for controlling gyro motor phase comprising: a gyro including a flywheel rotated by a synchronous motor; means for detecting periodic rotation of a reference point on the flywheel and generating a position pulse in respect to each rotational cycle; power supply means for the gyro motor; means connecting the output of the power supply means to the gyro motor; gating means connected at its input to the output of the detecting means; means connecting the output of the gating means to an input of the power supply means for providing a first reset pulse to the supply means which establishes a predetermined phase between the flywheel reference point and a vector of the motor rotating field; together with delaying means responsive to the first reset pulse for generating a second reset pulse delayed with respect to the first reset pulse; and means for connecting the delaying means to an input of the supply means for causing an additional phase shift of a preselected amount to occur thereby ensuring that the total phase shift exceeds a lag angle of the motor which might otherwise create uncertainty of data collected from a gyro.
Claim 6
Independent Claim
193 words
A system for controlling gyro motor phase comprising: a gyro including a flywheel rotated by a synchronous motor; means for detecting periodic rotation of a reference point on the flywheel and generating a position pulse in respect to each rotational cycle; power supply means for the gyro motor; means connecting the output of the power supply means to the gyro motor; gating means connected at its input to the output of the detecting means; means connecting the output of the gating means to an input of the power supply means for providing a first reset pulse to the supply means which establishes a predetermined phase between the flywheel reference point and a vector of the motor rotating field; together with delaying means responsive to the first reset pulse for generating a second reset pulse delayed with respect to the first reset pulse; and means for connecting the delaying means to an input of the supply means for causing an additional phase shift of a preselected amount to occur thereby ensuring that the total phase shift exceeds a lag angle of the motor which might otherwise create uncertainty of data collected from a gyro.
Claim 7
Dependent Claim
34 words
The system set forth in claim 3 together with means responsive to the second reset pulse for inhibiting the inputting of pulses to the supply means, subsequent to the first and second reset pulses.
Claim 8
Dependent Claim
40 words
The system of claim 4 wherein the delaying means includes a delay counter having an input thereof responsive to the first reset pulse, the second reset pulse being generated at the output of the counter after a preset count elapses.
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) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |