US3714541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage control apparatus for ac generators
Assignee: Hitachi Ltd
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Filing: 1971-04-19
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Granted: 1973-01-30
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Expires: 1991-04-19
Abstract
Abstract A saturable reactor is excited by the output of an AC generator, the field of which is controlled by a current exciting the reactor. Since the exciting current of the saturable reactor is proportional to an input voltage, the ratio of the output voltage to the output frequency of the AC generator is maintained constant.
Inventors
- 👤 T Kuwabara
- 👤 H Kiwaki
- 👤 H Sato
- 👤 Y Onoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:47
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/26; H02P9/30
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
90 words
A voltage control apparatus for AC generators comprising: a saturable reactor excited by an output voltage of an AC generator to be regulated so as to be normally saturated, thereby generating a voltage proportional to the output frequency of said AC generator, and a current control means for controlling the field current in said AC generator by means of an exciting current of said saturable reactor, said exciting current flowing depending on the difference between the voltage generated in said saturable reactor and the output voltage of said AC generator.
Claim 2
Dependent Claim
90 words
A voltage control apparatus for AC generators comprising: a saturable reactor excited by an output voltage of an AC generator to be regulated so as to be normally saturated, thereby generating a voltage proportional to the output frequency of said AC generator, and a current control means for controlling the field current in said AC generator by means of an exciting current of said saturable reactor, said exciting current flowing depending on the difference between the voltage generated in said saturable reactor and the output voltage of said AC generator.
Claim 3
Dependent Claim
90 words
A voltage control apparatus for AC generators comprising: a saturable reactor excited by an output voltage of an AC generator to be regulated so as to be normally saturated, thereby generating a voltage proportional to the output frequency of said AC generator, and a current control means for controlling the field current in said AC generator by means of an exciting current of said saturable reactor, said exciting current flowing depending on the difference between the voltage generated in said saturable reactor and the output voltage of said AC generator.
Claim 4
Dependent Claim
90 words
A voltage control apparatus for AC generators comprising: a saturable reactor excited by an output voltage of an AC generator to be regulated so as to be normally saturated, thereby generating a voltage proportional to the output frequency of said AC generator, and a current control means for controlling the field current in said AC generator by means of an exciting current of said saturable reactor, said exciting current flowing depending on the difference between the voltage generated in said saturable reactor and the output voltage of said AC generator.
Claim 5
Dependent Claim
22 words
A voltage control apparatus for AC generators according to claim 1, further comprising a resistor connected in series with said saturable reactor.
Claim 6
Dependent Claim
23 words
A voltage control apparatus for AC generators according to claim 1, further comprising a linear reactor connected in series with said saturable reactor.
Claim 7
Dependent Claim
102 words
A voltage control apparatus for an AC generator, comprising: first means, coupled to the output of the AC generator, for providing an exciting current, the magnitude of which corresponds to the difference between the voltage output of said AC generator and a reference voltage, the magnitude of said reference voltage being continuously proportional to the frequency of the voltage output of said AC generators; and second means, responsive to the output of said first means, for coupling said exciting current to said AC generator, whereby the ratio of the voltage output of said AC generator and the frequency thereof is maintained constant.
Claim 8
Dependent Claim
102 words
A voltage control apparatus for an AC generator, comprising: first means, coupled to the output of the AC generator, for providing an exciting current, the magnitude of which corresponds to the difference between the voltage output of said AC generator and a reference voltage, the magnitude of said reference voltage being continuously proportional to the frequency of the voltage output of said AC generators; and second means, responsive to the output of said first means, for coupling said exciting current to said AC generator, whereby the ratio of the voltage output of said AC generator and the frequency thereof is maintained constant.
Claim 9
Dependent Claim
28 words
A voltage control apparatus according to claim 4, wherein said first means comprises a saturable reactor coupled between the output of said AC generator and said first means.
Claim 10
Dependent Claim
47 words
A voltage control apparatus according to claim 5, wherein said second means further includes means, connected to the output of said saturable reactor, for controlling the loop gain between the output of said AC voltage generator and the control input through which said exciting current is coupled.
Claim 11
Dependent Claim
25 words
A voltage control apparatus according to claim 6, wherein said loop gain controlling means comprises a resistive element connected in series with said saturable reactor.
Claim 12
Dependent Claim
25 words
A voltage control apparatus according to claim 6, wherein said loop gain controlling means comprises a linear reactor connected in series with said saturable reactor.
Claim 13
Dependent Claim
63 words
A voltage control apparatus according to claim 6, wherein said second means comprises a bias winding through which said current flows and a variable attenuator coupled to said saturable reactor, and a magnetic phase shifter responsive to the output of said winding and the output of said AC generator for supplying a control voltage to the field winding provided in said AC generator.
Claim 14
Dependent Claim
28 words
A voltage control apparatus according to claim 9, further including a bias voltage supplying winding inductively coupled to said bias winding for supplying a distortion compensating voltage thereto.
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |