US3231805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control system of induction motor
Assignee: Individual
•
Filing: 1962-02-02
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Granted: 1966-01-25
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Expires: 1982-02-02
Abstract
No abstract record available.
Inventors
- 👤 Shibata Fukuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:59
CPC Classifications
H; H02; H02P; H02P27/00; H02P27/04; H02P27/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
IN A SPEED CONTROL CIRCUIT FOR AN INDUCTION MOTOR HAVING A PRIMARY WINDING SUPPLIED FROM AN ALTERNATING CURRENT SOURCE AND A WOUND SECONDARY WINDING, IN COMBINATION; A VARIABLE VOLTAGE RATIO TRANSFORMER IN THE OUTPUT CIRCUIT OF THE SECONDARY WINDING OF SAID INDUCTION MOTOR; SEMICONDUCTOR RECTIFIERS FOR CONVERTING AN ALTERNATING CURRENT OUTPUT TAKEN FROM SAID VARIABLE VOLTAGE RATIO TRANSFORMER TO DIRECT CURRENT; AN AUXILIARY DIRECT CURRENT MACHINE HAVING AN ARMATURE CIRCUIT SUPPLIED BY THE DIRECT CURRENT OUTPUT OF SAID SEMICONDUCTOR RECTIFIERS; A GENERATOR WHOSE ROTOR IS MECHANICALLY COUPLED TO THE ROTOR OF SAID AUXILIARY DIRECT CURRENT MACHINE OPERATING WITH A PREDETERMINED SPEED AND WHOSE TERMINALS ARE CONNECTED TO SAID ALTERNATING CURRENT SOURCE; WHEREBY SAID VARIABLE VOLTAGE RATIO TRANSFORMER ADJUSTS THE VOLTAGE RATIO AND CURRENT RATIO BETWEEN THE OUTPUT TERMINALS OF THE SECONDARY WINDINGS OF SAID INDUCTION MOTOR AND THE INPUT TERMINALS OF SAID AUXILIARY DIRECT CURRENT MACHINE.
Claim 2
Dependent Claim
146 words
IN A SPEED CONTROL CIRCUIT FOR AN INDUCTION MOTOR HAVING A PRIMARY WINDING SUPPLIED FROM AN ALTERNATING CURRENT SOURCE AND A WOUND SECONDARY WINDING, IN COMBINATION; A VARIABLE VOLTAGE RATIO TRANSFORMER IN THE OUTPUT CIRCUIT OF THE SECONDARY WINDING OF SAID INDUCTION MOTOR; SEMICONDUCTOR RECTIFIERS FOR CONVERTING AN ALTERNATING CURRENT OUTPUT TAKEN FROM SAID VARIABLE VOLTAGE RATIO TRANSFORMER TO DIRECT CURRENT; AN AUXILIARY DIRECT CURRENT MACHINE HAVING AN ARMATURE CIRCUIT SUPPLIED BY THE DIRECT CURRENT OUTPUT OF SAID SEMICONDUCTOR RECTIFIERS; A GENERATOR WHOSE ROTOR IS MECHANICALLY COUPLED TO THE ROTOR OF SAID AUXILIARY DIRECT CURRENT MACHINE OPERATING WITH A PREDETERMINED SPEED AND WHOSE TERMINALS ARE CONNECTED TO SAID ALTERNATING CURRENT SOURCE; WHEREBY SAID VARIABLE VOLTAGE RATIO TRANSFORMER ADJUSTS THE VOLTAGE RATIO AND CURRENT RATIO BETWEEN THE OUTPUT TERMINALS OF THE SECONDARY WINDINGS OF SAID INDUCTION MOTOR AND THE INPUT TERMINALS OF SAID AUXILIARY DIRECT CURRENT MACHINE.
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) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |