US3217222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary control circuit for a wound rotor induction motor
Assignee: Harris Graphics Corp
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Filing: 1964-09-10
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Granted: 1965-11-09
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Expires: 1984-09-10
Abstract
No abstract record available.
Inventors
- 👤 William H Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:53
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/16; H02P25/24; H02P25/26; B; B41; B41F; B41F13/00; B41F13/004; B41F13/0045; H02P27/00; H02P27/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
220 words
A MOTOR DRIVE COMPRISING A WOUND ROTOR INDUCTION MOTOR HAVING SECONDARY PHASE DINWINDS WHICH HAVE A VOTLAGE INDUCED THEREIN DEPENDENT UPON THE SPEED OF THE MOTOR AND MEANS FOR CONTROLLING THE SPEED OF THE MOTOR COMPRISING AN ELECTRICAL LOAD, ADJUSTABLE TRANSFORMER MEANS HAVING A PRIMARY CONNECTED TO THE SECONDARY WINDINGS OF SAID INDUCTION MOTOR AND A SECONDARY CONNECTED TO SAID ELECTRICAL LOAD FOR TRANSFERRING ENERGY THEREBETWEEN AT VARYING VOLTAGE RATIOS TO THEREBY VARY THE IMPEDANCE OF SAID ELECTRICAL LOAD APPARENT TO THE SECONDARY OF SAID INDUCTION MOTOR, MEANS PROVIDING AN ELECTRICAL SIGNAL HAVING A CHARACTERISTIC WHICH IS A FUNCTION OF THE SPEED OF SAID WOUND ROTOR INDUCTION MOTOR, ADJUSTABLE MEANS FOR PROVIDING A REFERENCE ELECTRICAL SIGNAL HAVING A CHARACTERISTIC ADJUSTABLE TO INDICATE A DESIRED SPEED OF SAID MOTOR, A CONTROL MOTOR MECHANICALLY CONNECTED TO SAID ADJUSTABLE TRANSFORMER MEANS AND OPERABLE IN OPPOSITE DIRECTIONS TO RESPECTIVELY INCREASE AND DECREASE THE VOLTAGE RATIO OF SAID TRANSFORMER MEANS SO AS TO VARY THE IMPEDANCE OF SAID LOAD APPARENT TO THE SECONDARY OF SAID INDUCTION MOTOR, AND CONTROL MEANS RESPONSIVE TO SAID SIGNALS AND EFFECTING OPERATING OF SAID CONTROL MOTOR IN ONE DIRECTION WHEN SAID CHARACTERISTICS DIFFER IN A FIRST DIRECTION AND OPERATING SAID CONTROL MOTOR IN A SECOND DIRECTION WHEN SAID CHARACTERITICS DIFFER IN THE OPPOSITE DIRECTION TO EFFECT CORRESPONDENCE OF SAID CHARACTERITICS.
Claim 2
Dependent Claim
220 words
A MOTOR DRIVE COMPRISING A WOUND ROTOR INDUCTION MOTOR HAVING SECONDARY PHASE DINWINDS WHICH HAVE A VOTLAGE INDUCED THEREIN DEPENDENT UPON THE SPEED OF THE MOTOR AND MEANS FOR CONTROLLING THE SPEED OF THE MOTOR COMPRISING AN ELECTRICAL LOAD, ADJUSTABLE TRANSFORMER MEANS HAVING A PRIMARY CONNECTED TO THE SECONDARY WINDINGS OF SAID INDUCTION MOTOR AND A SECONDARY CONNECTED TO SAID ELECTRICAL LOAD FOR TRANSFERRING ENERGY THEREBETWEEN AT VARYING VOLTAGE RATIOS TO THEREBY VARY THE IMPEDANCE OF SAID ELECTRICAL LOAD APPARENT TO THE SECONDARY OF SAID INDUCTION MOTOR, MEANS PROVIDING AN ELECTRICAL SIGNAL HAVING A CHARACTERISTIC WHICH IS A FUNCTION OF THE SPEED OF SAID WOUND ROTOR INDUCTION MOTOR, ADJUSTABLE MEANS FOR PROVIDING A REFERENCE ELECTRICAL SIGNAL HAVING A CHARACTERISTIC ADJUSTABLE TO INDICATE A DESIRED SPEED OF SAID MOTOR, A CONTROL MOTOR MECHANICALLY CONNECTED TO SAID ADJUSTABLE TRANSFORMER MEANS AND OPERABLE IN OPPOSITE DIRECTIONS TO RESPECTIVELY INCREASE AND DECREASE THE VOLTAGE RATIO OF SAID TRANSFORMER MEANS SO AS TO VARY THE IMPEDANCE OF SAID LOAD APPARENT TO THE SECONDARY OF SAID INDUCTION MOTOR, AND CONTROL MEANS RESPONSIVE TO SAID SIGNALS AND EFFECTING OPERATING OF SAID CONTROL MOTOR IN ONE DIRECTION WHEN SAID CHARACTERISTICS DIFFER IN A FIRST DIRECTION AND OPERATING SAID CONTROL MOTOR IN A SECOND DIRECTION WHEN SAID CHARACTERITICS DIFFER IN THE OPPOSITE DIRECTION TO EFFECT CORRESPONDENCE OF SAID CHARACTERITICS.
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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |