US3859577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for adjusting and commutating current in machine windings
Assignee: Jeumont Schneider SA
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Filing: 1973-07-02
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Granted: 1975-01-07
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Expires: 1993-07-02
Abstract
Abstract A system for adjusting and selectively commutating in the windings of a polyphase (n phase) electrical machine, the system being connected to an AC supply. The system is characterized in that it comprises a thyristorized reversible inverter which is connected to the power supply and which is associated with a smoothing inductance and adapted for an adjustable current on the DC side; a thyristorized 2 n-arm routing bridge whose n center points are connected to the n phase terminals respectively of the machine and in which the ends of each commutating group are connected to the output terminals of the reversible inverter which is adapted to route the adjustable DC cyclically through the n phase windings of the machine; a 2 n-arm diode bridge whose center points are connected to the phase terminals respectively of the machine and in which the end of each commutating group is connected to a circuit for turning off the routing thyristors and to a commutating circuit introducing a voltage difference between such end and the corresponding end of the routing thyristor bridge, the commutating circuit comprising a receiver sampling the reactive commutating energy produced in the machine windings.
Inventors
- 👤 Albert Wiart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:04
CPC Classifications
H; H02; H02P; H02P27/00; H02P27/04; H02P27/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
248 words
A circuit for commutating current in the windings of an nphase electrical machine wherein an AC supply is connected to a reversible inverter having DC output connections, said circuit comprising: a. inductor means having one end connected to one DC output connection of said reversible inverter for adjusting and smoothing the current of said one DC output connnection during commutating and non-commutating operations. b. a 2 n-arm thyristorized routing bridge having an input and an output side with n center points, said n center points connected to the n phase electrical machine, one side of said routing bridge connected to said inductor means, the other side of said routing bridge connected to the other DC output connection of said reversible inverter, c. a 2 n-arm diode bridge having an input and an output side with n center points, said n center points connected to the nphase electrical machine, d. turn-off circuit means connected between each side of said diode bridge and a corresponding side of said routing bridge for establishing a voltage difference between corresponding sides of said diode and said routing bridges for turning off the routing thyristors of said routing bridge, and e. transitional-commutating circuit means connected between each side of said diode bridge and the corresponding side of said routing bridge for sampling the reactive commutating energy produced in said machine windings, said transitionalcommutating circuit means and said inductor means connected in a series current path between said supply and said machine windings during commutation.
Claim 2
Dependent Claim
248 words
A circuit for commutating current in the windings of an nphase electrical machine wherein an AC supply is connected to a reversible inverter having DC output connections, said circuit comprising: a. inductor means having one end connected to one DC output connection of said reversible inverter for adjusting and smoothing the current of said one DC output connnection during commutating and non-commutating operations. b. a 2 n-arm thyristorized routing bridge having an input and an output side with n center points, said n center points connected to the n phase electrical machine, one side of said routing bridge connected to said inductor means, the other side of said routing bridge connected to the other DC output connection of said reversible inverter, c. a 2 n-arm diode bridge having an input and an output side with n center points, said n center points connected to the nphase electrical machine, d. turn-off circuit means connected between each side of said diode bridge and a corresponding side of said routing bridge for establishing a voltage difference between corresponding sides of said diode and said routing bridges for turning off the routing thyristors of said routing bridge, and e. transitional-commutating circuit means connected between each side of said diode bridge and the corresponding side of said routing bridge for sampling the reactive commutating energy produced in said machine windings, said transitionalcommutating circuit means and said inductor means connected in a series current path between said supply and said machine windings during commutation.
Claim 3
Dependent Claim
49 words
A circuit according to claim 1 wherein said transitional-commutating circuit means includes a single means, common to two individual transitional-commutating circuits associated respectively with each side of said diode bridge circuit and said routing bridge circuit, said single means sampling the reactive commutating energy produced in the machine windings.
Claim 4
Dependent Claim
63 words
A circuit according to claim 2 wherein said single means is a capacitor, one side of the capacitor connected to a second inductor means the other side of said capacitor and the other side of said second inductor means respectively connected to the input connections of an inverter, the output connection of said inverter connected to the AC supply through a voltAge-matching transformer.
Claim 5
Dependent Claim
22 words
A circuit according to claim 2 wherein each individual transitional-commutating circuit comprises at least one diode in series with said single means.
Claim 6
Dependent Claim
58 words
A circuit according to claim 1 wherein said circuit means for turning off the routing thyristors of said routing bridge comprises a capacitor in series with a thyristor for each side of said diode bridge and said routing bridge, each of said capacitors being associated with a charge-reversing circuit, each charge-reversing circuit comprising a thyristor and an inductance.
Claim 7
Dependent Claim
47 words
A circuit according to claim 1 wherein said circuit means for turning off the routing thyristors of said routing bridge comprises a common turn-off capacitor and thyristor means, and wherein for each side of said diode bridge and said routing bridge said thyristor means comprises two thyristors.
Claim 8
Dependent Claim
28 words
A circuit according to claim 6 wherein a single means for sampling the reactive commutating energy produced in the machine windings is connected across said common turn-off capacitor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |