Patent US3984754A successfully refreshed from Google Patents.
US3984754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for automatic excitation of brushless electrical machines
Assignee: Individual
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Filing: 1974-12-11
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Granted: 1976-10-05
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Expires: 1994-12-11
Abstract
Abstract A device for automatic excitation of brushless electrical machines, comprising: an A.C. exciter feeding a power converter built around controlled rectifiers disposed on a machine shaft; a converter control circuit employing optoelectronic elements with light-emitting diodes, composed of a booster unit, an inverter unit, and a unit intended for transfer of the converter into a non-controlled rectifier mode; and a photodetector receiving light signals from a stationary light source and located on the machine shaft. The device permits continuous control from boosting modes to inversion.
Inventors
- 👤 Kronid Vasilievich Lapaev
- 👤 Lev Zalmanovich Madorsky
- 👤 Mikhail Alexandrovich Osinin
- 👤 Viktor Markovich Fux
- 👤 Ekaterina Vladimirovna Sanchuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:29
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/36; H02P9/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
207 words
A device for automatic excitation of brushless electrical machines having a shaft, said device comprising: an A.C. exciter; a power converter including controlled rectifiers and mounted on the machine shaft; a control circuit for said converter also mounted on the machine shaft and including a booster unit, an inverter unit, and a unit for transfer of said converter into a non-controlled rectifier mode; a stationary light source composed of light-emitting elements; a photodetector including photo-electric switches and ganged phototransistors which are disposed concentrically with a shift relative to the axes of the directional patterns of said light-emitting elements; said units of said control circuit including optoelectronic elements with the light-emitting diodes thereof connected to said A.C. exciter and constituting rectifiers, such that gate operation is timed with the operation of the rectifiers in said converter, the light-emitting diodes of the optoelectronic elements of said unit for transfer of the converter into a non-controlled rectifier mode being connected to the diodes of the inverter unit through a semiconductor switch, and the light-emitting diodes of the optoelectronic elements of said booster unit being connected to the output of said semi-conductor switch through said photodetector. said forcing unit are connected to the output of said semi-conductor switch through said photodetector.
Claim 2
Independent Claim
207 words
A device for automatic excitation of brushless electrical machines having a shaft, said device comprising: an A.C. exciter; a power converter including controlled rectifiers and mounted on the machine shaft; a control circuit for said converter also mounted on the machine shaft and including a booster unit, an inverter unit, and a unit for transfer of said converter into a non-controlled rectifier mode; a stationary light source composed of light-emitting elements; a photodetector including photo-electric switches and ganged phototransistors which are disposed concentrically with a shift relative to the axes of the directional patterns of said light-emitting elements; said units of said control circuit including optoelectronic elements with the light-emitting diodes thereof connected to said A.C. exciter and constituting rectifiers, such that gate operation is timed with the operation of the rectifiers in said converter, the light-emitting diodes of the optoelectronic elements of said unit for transfer of the converter into a non-controlled rectifier mode being connected to the diodes of the inverter unit through a semiconductor switch, and the light-emitting diodes of the optoelectronic elements of said booster unit being connected to the output of said semi-conductor switch through said photodetector. said forcing unit are connected to the output of said semi-conductor switch through said photodetector.
Claim 3
Dependent Claim
68 words
A device as defined in claim 1, in which a semiconductor switch comprises a base-emitter junction of a transistor connected in series with a differentiating capacitor, and an integrating capacitor connected between the emitter and collector of said transistor, the integrating capacitor being connected through a thyristor switch to the light-emitting diodes of optoelectronic elements of the unit for transfer of the converter into a non-controlled rectifier mode.
Claim 4
Dependent Claim
84 words
A device as defined in claim 1, in which the photoelectric switches of said photodetector and the light-emitting elements of said light source are mounted on rings disposed, respectively, on the shaft and the stator of the machine, each sector of the ring on the shaft containing parallel-connected phototransistor of said photoelectric switches, while the stator ring accommodates light-emitting elements the number of which within any angle of the sector ring differs by 1 from the number of phototransistors mounted in the same sector.
References Cited (Backward Citations)
US3660752A
Cited
US3858107A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |