US3758843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brushless excitation device
Assignee: Meidensha Corp
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Filing: 1972-06-27
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Granted: 1973-09-11
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Expires: 1992-06-27
Abstract
Abstract A brushless excitation device in which the output voltage and load current of an A.C. generator are detected and the detected voltage and current are applied to an automatic voltage regulator inserted and connected into a rotary portion of the generator by means of a rotary transformer, the field current of the generator being controlled by the output of the automatic voltage regulator.
Inventors
- 👤 A Ishizaki
- 👤 T Hirasawa
- 👤 M Nakamura
- 👤 T Kawade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:35
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/26; H02P9/30; H02P9/302; H02P9/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
111 words
A brushless excitation device for supplying a field current to field windings of an A.C. generator which generates an output voltage, said excitation device comprising an A.C. excitation means for producing an output current, rectifier means including control rectifiers connected to said field windings of said A.C. generator, a rotary transformer having rotary and stationary sides and receiving the output voltage of said A.C. generator at the stationary side, automatic voltage regulation means mounted on the rotary side for receiving the output voltage received at the stationary side of said rotary transformer through the rotary side thereof, said control rectifiers being controlled by the output of said automatic voltage regulation means.
Claim 2
Dependent Claim
111 words
A brushless excitation device for supplying a field current to field windings of an A.C. generator which generates an output voltage, said excitation device comprising an A.C. excitation means for producing an output current, rectifier means including control rectifiers connected to said field windings of said A.C. generator, a rotary transformer having rotary and stationary sides and receiving the output voltage of said A.C. generator at the stationary side, automatic voltage regulation means mounted on the rotary side for receiving the output voltage received at the stationary side of said rotary transformer through the rotary side thereof, said control rectifiers being controlled by the output of said automatic voltage regulation means.
Claim 3
Dependent Claim
48 words
A brushless excitation device as claimed in claim 1 comprising a compound characteristic synthesizing means for effecting superposition of current or voltage and connected to the output of the A.C. generator, and means for applying exciting energy to the A.C. excitation machine through the compound characteristic synthesizinG means.
Claim 4
Dependent Claim
21 words
A brushless excitation device as claimed in claim 1 comprising a permanent magnet generator supplying field power to the A.C. generator.
Claim 5
Dependent Claim
129 words
A brushless excitation device as claimed in claim 1 in which said rotary transformer is adapted to transmit the voltage proportional to the terminal voltage of said A.C. generator to the rotary side and the automatic voltage regulation means mounted on the rotary side comprises a reference voltage setting circuit for setting a reference voltage by rectifying the output current of said excitation means, a comparing circuit for comparing the D.C. output voltage of said rectifier means which has an A.C. input side connected to the rotary side of the rotary transformer to obtain a deviation voltage, an amplifier circuit for amplifying the deviation voltage obtained from the comparing circuit, and a phase control circuit for converting the amplified deviation voltage to a control signal for the control rectifier.
Claim 6
Dependent Claim
129 words
A brushless excitation device as claimed in claim 2 in which said rotary transformer is adapted to transmit the voltage proportional to the terminal voltage of said A.C. generator to the rotary side and the automatic voltage regulation means mounted on the rotary side comprises a reference voltage setting circuit for setting a reference voltage by rectifying the output current of said excitation means, a comparing circuit for comparing the D.C. output voltage of said rectifier means which has an A.C. input side connected to the rotary side of the rotary transformer to obtain a deviation voltaGe, an amplifier circuit for amplifying the deviation voltage obtained from the comparing circuit, and a phase control circuit for converting the amplified deviation voltage to a control signal for the control rectifier.
Claim 7
Dependent Claim
128 words
A brushless excitation device as claimed in claim 3 in which said rotary transformer is adapted to transmit to the voltage proportional to the terminal voltage of said A.C. generator to the rotary side the automatic voltage regulator mounted on the rotary side comprises a reference voltage setting circuit for setting a reference voltage by rectifying the output current of said excitation means, a comparing circuit for comparing the D.C. output voltage of said rectifier means which has an A.C. input side connected to the rotary side of the rotary transformer to obtain a deviation voltage, an amplifier circuit for amplifying the deviation voltage obtained from the comparing circuit, and a phase control circuit for converting the amplified deviation voltage into a control signal for the control rectifier.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |