US3586944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversing controller for dc motor
Assignee: Infineon Technologies Americas Corp
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Filing: 1970-02-24
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Granted: 1971-06-22
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Expires: 1990-02-24
Abstract
Abstract Controlled rectifiers are fired in selective groups in order to energize a DC motor for forward rotation, reverse rotation, motor stopping and motor stopping with dynamic braking. The control circuits for firing selected groups of controlled rectifiers are carried in respective modules, some of which are interchangeable and which provide electrical lockout for preventing energization of groups of controlled rectifiers until a particular sequence is completed. Forward and reverse operation of the motor and stopping of the motor are carried out with predetermined time delays.
Inventors
- 👤 David Cooper
- 👤 Frank W Parrish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:56
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
277 words
A motor control circuit for a reversible DC motor; said reversible DC motor having an armature and a field winding means; said motor control circuit including a main source of DC power and first, second, third, fourth and fifth controlled rectifiers; each of said controlled rectifiers having anode, cathode and control electrode terminals; said armature having first and second terminals; the anode electrode of said first and the cathode electrode of said second controlled rectifiers connected to said first and second terminals of said armature, respectively, the anode electrode of said third and the cathode electrode of said fourth controlled rectifiers connected to said second and first terminals of said armature, respectively; said cathode electrodes of said first and third controlled rectifiers connected to one another; said anode electrodes of said second and fourth controlled rectifiers connected to one another; said fifth controlled rectifier connected in series with each of said first to fourth controlled rectifiers and conducting forward current in the same direction as said first to fourth controlled rectifiers; circuit means connecting said field winding means, fifth controlled rectifier and main source DC power in series; said main source of DC power connected in series with said first to fourth controlled rectifiers and said fifth controlled rectifier; whereby conduction of said first, second and fifth controlled rectifiers produces rotation of said motor in one direction, and whereby conduction of said third, fourth and fifth controlled rectifiers produces rotation of said motor in an opposite direction to said one direction; and gate signal generating means connected to said control electrode terminals for generating firing signals for firing said first to fifth controlled rectifiers in given groups.
Claim 2
Dependent Claim
277 words
A motor control circuit for a reversible DC motor; said reversible DC motor having an armature and a field winding means; said motor control circuit including a main source of DC power and first, second, third, fourth and fifth controlled rectifiers; each of said controlled rectifiers having anode, cathode and control electrode terminals; said armature having first and second terminals; the anode electrode of said first and the cathode electrode of said second controlled rectifiers connected to said first and second terminals of said armature, respectively, the anode electrode of said third and the cathode electrode of said fourth controlled rectifiers connected to said second and first terminals of said armature, respectively; said cathode electrodes of said first and third controlled rectifiers connected to one another; said anode electrodes of said second and fourth controlled rectifiers connected to one another; said fifth controlled rectifier connected in series with each of said first to fourth controlled rectifiers and conducting forward current in the same direction as said first to fourth controlled rectifiers; circuit means connecting said field winding means, fifth controlled rectifier and main source DC power in series; said main source of DC power connected in series with said first to fourth controlled rectifiers and said fifth controlled rectifier; whereby conduction of said first, second and fifth controlled rectifiers produces rotation of said motor in one direction, and whereby conduction of said third, fourth and fifth controlled rectifiers produces rotation of said motor in an opposite direction to said one direction; and gate signal generating means connected to said control electrode terminals for generating firing signals for firing said first to fifth controlled rectifiers in given groups.
Claim 3
Dependent Claim
30 words
The circuit of claim 1 which includes commutation turnoff circuit means for turning-off said fifth controlled rectifier while power is connected to said armature from said source of DC power.
Claim 4
Dependent Claim
50 words
The motor control circuit of claim 1 wherein said field winding means includes a series field winding in series with each of said first to fifth controlled rectifiers and a shunt field winding in parallel with said first to fourth controlled rectifiers and in series with said fifth controlled rectifier.
Claim 5
Dependent Claim
18 words
The circuit of claim 1 which includes a mechanical brake winding in series with said fifth controlled rectifier.
Claim 6
Dependent Claim
24 words
The circuit of claim 1 wherein each of said first to fifth controlled rectifiers have respective series connected resistors and capacitors in parallel therewith.
Claim 7
Dependent Claim
34 words
The circuit of claim 1 which includes across said source of DC power, for line voltage regulation, a parallel connected diode and choke in series with a parallel connected large capacitor and small capacitor.
Claim 8
Dependent Claim
96 words
The control circuit of claim 1 which includes firing circuit means for firing, in groups, a first group including said first, second and fifth controlled rectifier; and a second group including said third, fourth and fifth controlled rectifier; said firing circuit means including first and second input circuits for firing said first and second groups responsive to the connection of respective continuous input signals thereto; said firing circuit means including time-delay means for firing said first and second groups with a given time-delay following the application of input signals to said first and second input circuits.
Claim 9
Dependent Claim
133 words
The circuit of claim 2 wherein said commutation circuit includes a capacitor and sixth and seventh controlled rectifiers; said sixth and seventh controlled rectifiers connected in series with one another and with said source of DC power; said capacitor connected in closed series circuit with said source of DC Power, said sixth controlled rectifier and said fifth controlled rectifier; and firing circuit means connected to the control electrodes of said sixth and seventh controlled rectifier for firing said sixth controlled rectifier while said fifth controlled rectifier is conducting, thereby to charge said capacitor through said fifth controlled rectifier, and thereafter to fire said seventh controlled rectifier, thereby to discharge said capacitor through said seventh controlled rectifier and in the reverse direction of said fifth controlled rectifier, thereby to extinguish said fifth controlled rectifier.
Claim 10
Dependent Claim
35 words
The circuit of claim 3 which includes respective diodes in parallel with said series winding and said shunt winding; said diodes being poled in opposition to the forward current-carrying direction of said fifth controlled rectifier.
Claim 11
Dependent Claim
53 words
The circuit of claim 3 which further includes a diode connected in parallel with the series connection of said first to fourth controlled rectifiers and said series field winding for carrying a circulating current through said armature and series field winding to obtain dynamic braking when said fifth controlled rectifier is made nonconductive.
Claim 12
Dependent Claim
37 words
The circuit of claim 4 which includes a series connected diode and thyrite resistor in parallel with said mechanical brake winding; said diode being poled in opposition to the forward current-carrying direction of said fifth controlled rectifier.
Claim 13
Dependent Claim
32 words
The control circuit of claim 7 which further includes lockout circuit means connected to said firing circuit means for preventing the firing of one of said groups while the other is conducting.
Claim 14
Dependent Claim
96 words
The control circuit of claim 8 which includes firing circuit means for firing, in groups, a first group including said first, second and fifth controlled rectifier; and a second group including said third, fourth and fifth controlled rectifier; said firing circuit means including first and second input circuits for firing said first and second groups responsive to the connection of respective continuous input signals thereto; said firing circuit means including time-delay means for firing said first and second groups with a given time-delay following the application of input signals to said first and second input circuits.
Claim 15
Dependent Claim
48 words
The circuit of claim 8 wherein said field winding means includes a series field winding in series with each of said first to fifth controlled rectifiers and a shunt field winding in parallel with said first to fourth controlled rectifiers and in series with said fifth controlled rectifier.
Claim 16
Dependent Claim
52 words
The circuit of claim 9 which includes a mechanical brake winding in series with said fifth controlled rectifier; and which further includes a series connected diode and thyrite resistor in parallel with said mechanical brake winding; said diode being poled in opposition to the forward current-carrying direction of said fifth controlled rectifier.
Claim 17
Dependent Claim
29 words
The circuit of claim 10 wherein a diode is connected in parallel with said shunt winding and permits the decay of the shunt winding energy therethrough during dynamic braking.
Claim 18
Dependent Claim
96 words
The control circuit of claim 12 which includes firing circuit means for firing, in groups, a first group including said first, second and fifth controlled rectifier; and a second group including said third, fourth and fifth controlled rectifier; said firing circuit means including first and second input circuits for firing said first and second groups responsive to the connection of respective continuous input signals thereto; said firing circuit means including time-delay means for firing said first and second groups with a given time-delay following the application of input signals to said first and second input circuits.
Claim 19
Dependent Claim
53 words
The circuit of claim 14 which further includes a diode connected in parallel with the series connection of said first to fourth controlled rectifiers and said series field winding for carrying a circulating current through said armature and series field winding to obtain dynamIc braking when said fifth controlled rectifier is made nonconductive.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |