US3863137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exciting system for alternator
Assignee: Hitachi Ltd
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Filing: 1973-08-17
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Granted: 1975-01-28
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Expires: 1993-08-17
Abstract
Abstract An exciting system for a brushless alternator in which the field coil of an exciter has a double winding structure, and current is supplied to one of the field coil windings from a permanent magnet generator, while current proportional to the load current of the alternator is supplied to the other field coil winding through a current converter, so as to promote recovery of the output voltage against momentary fluctuations of the load, to improve the output waveform of the alternator, to protect the system against short-circuit trouble, and to reduce the size and weight of the brushless alternator set.
Inventors
- 👤 Nobuo Mishima
- 👤 Takeshi Yamaguchi
- 👤 Sozaburo Yoshizawa
- 👤 Torao Kobayashi
- 👤 Takashi Yamade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:53
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/36; H02K; H02K19/00; H02K19/16; H02K19/26; H02K19/30; H02P2101/00; H02P2101/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
141 words
An exciting system for a brushless alternator comprising an exciter having an armature coil and a field coil, rectifier means mounted on a rotary shaft for converting a.c. power produced by said exciter into d.c. power, and means for supplying said d.c. power to a field coil of said alternator for deriving an output voltage from an armature coil of said alternator, wherein said field coil of said exciter has a double winding structure including two field coil windings, a permanent magnet generator, a current converter, a rectifier connected to the output terminal of said permanent magnet generator for supplying d.c. power to one of said two field coil windings, and another rectifier connected to the output terminal of said current converter for supplying d.c. power proportional to the output voltage of said alternator to the other said field coil winding.
Claim 2
Dependent Claim
141 words
An exciting system for a brushless alternator comprising an exciter having an armature coil and a field coil, rectifier means mounted on a rotary shaft for converting a.c. power produced by said exciter into d.c. power, and means for supplying said d.c. power to a field coil of said alternator for deriving an output voltage from an armature coil of said alternator, wherein said field coil of said exciter has a double winding structure including two field coil windings, a permanent magnet generator, a current converter, a rectifier connected to the output terminal of said permanent magnet generator for supplying d.c. power to one of said two field coil windings, and another rectifier connected to the output terminal of said current converter for supplying d.c. power proportional to the output voltage of said alternator to the other said field coil winding.
Claim 3
Dependent Claim
195 words
An exciting system for a brushless alternator having an armature coil and a field coil, comprising an exciter having an armature coil and a field coil, first rectifier means, a permanent magnet generator having an armature coil and a permanent magnet rotor, a rotary shaft driven by drive means and having said field coil of said alternator, said first rectifier means, said armature coil of said exciter and said permanent magnet rotor of said permanent magnet generator fixedly mounted thereon, said armature coil of said exciter being connected to said field coil of said alternator through said first rectifier means, a current converter said field coil of said exciter being divided into two coil windings one of which is connected through a controlled rectifier to the terminal of said armature coil of said permanent magnet generator and the other of which is connected through second rectifier means to a current converter disposed in an output line connected to the terminal of said armature coil of said alternator, a voltage detector connected to said output line, and a voltage regulator responsive to the output of said voltage detector for controlling the conduction of said controlled rectifier.
Claim 4
Dependent Claim
195 words
An exciting system for a brushless alternator having an armature coil and a field coil, comprising an exciter having an armature coil and a field coil, first rectifier means, a permanent magnet generator having an armature coil and a permanent magnet rotor, a rotary shaft driven by drive means and having said field coil of said alternator, said first rectifier means, said armature coil of said exciter and said permanent magnet rotor of said permanent magnet generator fixedly mounted thereon, said armature coil of said exciter being connected to said field coil of said alternator through said first rectifier means, a current converter said field coil of said exciter being divided into two coil windings one of which is connected through a controlled rectifier to the terminal of said armature coil of said permanent magnet generator and the other of which is connected through second rectifier means to a current converter disposed in an output line connected to the terminal of said armature coil of said alternator, a voltage detector connected to said output line, and a voltage regulator responsive to the output of said voltage detector for controlling the conduction of said controlled rectifier.
Claim 5
Dependent Claim
147 words
An exciting system for a brushless alternator having an armature coil and a field coil, comprising an exciter having an armature coil and a field coil, rectifier means mounted on a rotary shaft for converting a.c. power produced by said exciter into d.c. power, and means for supplying said d.c. power to the field coil of Said alternator for deriving an output voltage from the armature coil of said alternator, wherein said field coil of said exciter has a double winding structure including two field coil windings, a permanent magnet generator is provided, which is connected to and serves as a power source for one of said two field coil windings, and a current converter for obtaining a.c. power proportional to the output voltage of said alternator is provided, which is connected to and serves as a power source for the other of said field coil windings.
Claim 6
Dependent Claim
147 words
An exciting system for a brushless alternator having an armature coil and a field coil, comprising an exciter having an armature coil and a field coil, rectifier means mounted on a rotary shaft for converting a.c. power produced by said exciter into d.c. power, and means for supplying said d.c. power to the field coil of Said alternator for deriving an output voltage from the armature coil of said alternator, wherein said field coil of said exciter has a double winding structure including two field coil windings, a permanent magnet generator is provided, which is connected to and serves as a power source for one of said two field coil windings, and a current converter for obtaining a.c. power proportional to the output voltage of said alternator is provided, which is connected to and serves as a power source for the other of said field coil windings.
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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |