US3639819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switcher-chopper for controlling current in brushless rotating machines, supplied by a dc source
Assignee: Jeumont Schneider SA
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Filing: 1969-11-28
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Granted: 1972-02-01
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Expires: 1989-11-28
Abstract
Abstract A system for switching, reversing and varying the current flowing through the windings of a DC energized electrical machine, comprising: a two-winding smoothing reactor; two sets of supply thyristors connected by their anodes and cathode respectively to the machine terminals and to the two sides of a DC supply via one of the reactor windings; two sets of freewheeling thyristors connected like the supply thyristors to the machine terminals and interconnected to form two common points, one of which is taken to one end of the second reactor winding; and means for triggering chopping, switching and reversing operations with the use of at least one freewheeling or braking circuit.
Inventors
- 👤 Albert C Wiart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:11
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/5152; H02M7/5155; H02P; H02P6/00; H02P6/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
206 words
A system for switching, reversing and varying the current flowing through the machine terminals and the machine windings of a direct current electrical machine, comprising: an interleaved two-winding smoothing reactor; a direct current supply having two supply terminals; two sets of supply thyristors; a first set of said supply thyristors connected between one of said supply terminals and said machine terminals; the second set of said supply thyristors connected between said machine terminals and the other of said supply terminals through one winding of said reactor; at least one freewheeling connecting line; two sets of freewheeling thyristors; a first set of said freewheeling thyristors connected between one of said freewheeling lines and said machine terminals and oriented in the same direction as said first set of supply thyristors; the second set of said freewheeling thyristors oriented in the same direction as said second set of supply thyristors and connected between said machine terminals and one of said freewheeling lines through the other of said reactor windings; whereby a freewheeling circuit is formed including at least one thyristor of one of said sets of freewheeling thyristors, said second winding of said reactor, at least one of said freewheeling lines, and at least one of said machinE windings.
Claim 2
Independent Claim
206 words
A system for switching, reversing and varying the current flowing through the machine terminals and the machine windings of a direct current electrical machine, comprising: an interleaved two-winding smoothing reactor; a direct current supply having two supply terminals; two sets of supply thyristors; a first set of said supply thyristors connected between one of said supply terminals and said machine terminals; the second set of said supply thyristors connected between said machine terminals and the other of said supply terminals through one winding of said reactor; at least one freewheeling connecting line; two sets of freewheeling thyristors; a first set of said freewheeling thyristors connected between one of said freewheeling lines and said machine terminals and oriented in the same direction as said first set of supply thyristors; the second set of said freewheeling thyristors oriented in the same direction as said second set of supply thyristors and connected between said machine terminals and one of said freewheeling lines through the other of said reactor windings; whereby a freewheeling circuit is formed including at least one thyristor of one of said sets of freewheeling thyristors, said second winding of said reactor, at least one of said freewheeling lines, and at least one of said machinE windings.
Claim 3
Independent Claim
246 words
A system for switching, reversing, and varying the current flowing through the machine terminals and the machine windings of a direct current electrical machine, comprising: a multiwinding smoothing reactor with interleaved windings each of said interleaved windings having two end terminals and an output terminal, said output terminal connected to one of said machine terminals; a direct current supply having two supply terminals; two sets of supply thyristors, a first set of said supply thyristors connected between one of said supply terminals and one of said end terminals of said interleaved windings, the second set of said supply thyristors connected between the other if said supply terminals and the other of said end terminals of said interleaved windings; at least one free wheeling connecting line; two sets of freewheeling thyristors, a first set of said freewheeling thyristors connected between one of said freewheeling lines and one of said end terminals of said interleaved windings and oriented in the same direction as said first set of supply thyristors, the second set of said freewheeling thyristors connected between one of said freewheeling lines and the other of said end terminals of said interleaved windings and oriented in the same direction as said second set of supply thyristors; whereby a freewheeling circuit is formed including at least one thyristor of one of said sets of freewheeling thyristors, at least one of said interleaved windings, at least one of said freewheeling lines, and at least one of said machine windings.
Claim 4
Independent Claim
246 words
A system for switching, reversing, and varying the current flowing through the machine terminals and the machine windings of a direct current electrical machine, comprising: a multiwinding smoothing reactor with interleaved windings each of said interleaved windings having two end terminals and an output terminal, said output terminal connected to one of said machine terminals; a direct current supply having two supply terminals; two sets of supply thyristors, a first set of said supply thyristors connected between one of said supply terminals and one of said end terminals of said interleaved windings, the second set of said supply thyristors connected between the other if said supply terminals and the other of said end terminals of said interleaved windings; at least one free wheeling connecting line; two sets of freewheeling thyristors, a first set of said freewheeling thyristors connected between one of said freewheeling lines and one of said end terminals of said interleaved windings and oriented in the same direction as said first set of supply thyristors, the second set of said freewheeling thyristors connected between one of said freewheeling lines and the other of said end terminals of said interleaved windings and oriented in the same direction as said second set of supply thyristors; whereby a freewheeling circuit is formed including at least one thyristor of one of said sets of freewheeling thyristors, at least one of said interleaved windings, at least one of said freewheeling lines, and at least one of said machine windings.
Claim 5
Dependent Claim
28 words
A system as set forth in claim 1, comprising, for triggering switching and chopping operations, a contactor connected in the supply, the freewheeling circuit being closed on itself.
Claim 6
Dependent Claim
58 words
A system as set forth in claim 1, wherein a capacitor shunted by a diode is connected in said freewheeling circuit and is normally charged to a voltage higher than the supply voltage and is discharged by the firing of the freewheeling thyristor corresponding to the supply thyristor in operation, to trigger said a switching and chopping operations.
Claim 7
Dependent Claim
53 words
A system, as set forth in claim 1, wherein a capacitor is connected into said freewheeling circuit, a diode is connected between one of said supply terminals and one side of said capacitor, and a second diode is connected between the other of said supply terminals and the other side of said capacitor.
Claim 8
Dependent Claim
25 words
A system as set forth in claim 5, comprising in parallel with the capacitor a rheostat in series with a diode for producing rheostatic braking.
Claim 9
Dependent Claim
25 words
A system as set forth in claim 5, wherein diodes are used instead of the freewheeling thyristors of one of said sets of freewheeling thyristors.
Claim 10
Dependent Claim
81 words
A system as set forth in claim 1 wherein said freewheeling circuit includes two capacitors, each shunting by a diode, the first of said capacitors connected in one of said freewheeling lines which connect the first of said supply terminals to the second set of said freewheeling thyristors through the other of said reactor windings, the second of said capacitors connected in another of said freewheeling lines which connects the first sets of said freewheeling thyristors to the second supply terminal.
Claim 11
Dependent Claim
76 words
A system as set forth in claim 2 wherein said freewheeling circuit includes two capacitors, each shunted by a diode, the first of said capacitors connected in one of said freewheeling lines which connects the first set of said freewheeling thyristors to the second of said supply terminals, the second of said capacitors connected in another of said freewheeling lines which connects the second set of said freewheeling thyristors to the first of said supply terminals.
Claim 12
Dependent Claim
23 words
A system as set forth in claim 8, wherein said freewheeling circuit is closed by way of a rheostat to produce rheostatic braking.
Claim 13
Dependent Claim
35 words
A system as set forth in claim 9, wherein diodes are used instead of the freewheeling thyristors of one of the sets and a thyristor is connected in series wiTh the resulting set of diodes.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |