US3419774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Position control servo mechanism using a trigonometric function generator
Assignee: EMI Ltd
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Filing: 1965-02-02
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Granted: 1968-12-31
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Expires: 1985-02-02
Abstract
No abstract record available.
Inventors
- 👤 Hartley Frederick Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:40
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/22; G05; G05D; G05D3/00; G05D3/12; G05D3/121; G05D3/122
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A POSITION CONTROL SERVO MECHANISM INCLUDING A RESOLVER HAVING FIRST AND SECOND RELATIVELY MOVABLE PARTS EACH PROVIDED WITH TWO INDUCTORS IN QUADRATURE, MEANS FOR PRODUCING AND APPLYING TO THE REPECTIVE INDUCTORS ON THE FIRST PART ALTERNATING VOLTAGES RESPECTIVELY REPRESENTING THE SINE AND COSINE OF A FIRST ANGLE, MEANS FOR DERIVING AN OUTPUT VOLTAGE FROM ONE OF THE INDUCTORS ON THE SECOND PART, AND MEANS FOR PRODUCING RELATIVE DISPLACEMENT OF THE RESOLVER PARTS IN RESPONSE TO THE OUTPUT VOLTAGE IN A SENSE TENDING TO REDUCE THE OUTPUT VOLTAGE, WHEREIN THE IMPROVEMENT COMPRISES MEANS FOR DERIVING A SECOND OUTPUT VOLTAGE FROM THE OTHER OF THE INDUCTORS ON THE SECOND PART, MEANS FOR PRODUCING A FRACTION OF THE SECOND OUTPUT VOLTAGE, WHICH FRACTION IS DEPENDENT ON A SECOND ANGLE, AND MEANS FOR ADDING THE FRACTION OF THE SECOND OUTPUT VOLTAGE TO THE OUTPUT VOLTAGE FROM THE ONE OF THE INDUCTORS ON THE SECOND PART TO MODIFY THE LATTER OUTPUT VOLTAGE. WHEREBY THE RELATIVE DISPLACEMENT TENDS TO THAT REPRESENTED BY THE SUM OF THE FIRST AND SECOND ANGLES.
Claim 2
Dependent Claim
174 words
A POSITION CONTROL SERVO MECHANISM INCLUDING A RESOLVER HAVING FIRST AND SECOND RELATIVELY MOVABLE PARTS EACH PROVIDED WITH TWO INDUCTORS IN QUADRATURE, MEANS FOR PRODUCING AND APPLYING TO THE REPECTIVE INDUCTORS ON THE FIRST PART ALTERNATING VOLTAGES RESPECTIVELY REPRESENTING THE SINE AND COSINE OF A FIRST ANGLE, MEANS FOR DERIVING AN OUTPUT VOLTAGE FROM ONE OF THE INDUCTORS ON THE SECOND PART, AND MEANS FOR PRODUCING RELATIVE DISPLACEMENT OF THE RESOLVER PARTS IN RESPONSE TO THE OUTPUT VOLTAGE IN A SENSE TENDING TO REDUCE THE OUTPUT VOLTAGE, WHEREIN THE IMPROVEMENT COMPRISES MEANS FOR DERIVING A SECOND OUTPUT VOLTAGE FROM THE OTHER OF THE INDUCTORS ON THE SECOND PART, MEANS FOR PRODUCING A FRACTION OF THE SECOND OUTPUT VOLTAGE, WHICH FRACTION IS DEPENDENT ON A SECOND ANGLE, AND MEANS FOR ADDING THE FRACTION OF THE SECOND OUTPUT VOLTAGE TO THE OUTPUT VOLTAGE FROM THE ONE OF THE INDUCTORS ON THE SECOND PART TO MODIFY THE LATTER OUTPUT VOLTAGE. WHEREBY THE RELATIVE DISPLACEMENT TENDS TO THAT REPRESENTED BY THE SUM OF THE FIRST AND SECOND ANGLES.
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) | 1971-12-31 | 1972-07-01 | 1972-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-31 | 1976-07-01 | 1976-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-31 | 1980-07-01 | 1980-12-31 | $7700.00 | Window Closed / Lapsed |