GB624937A - Improvements in or relating to electric motor control systems - Google Patents
Improvements in or relating to electric motor control systemsInfo
- Publication number
- GB624937A GB624937A GB18672/47A GB1867247A GB624937A GB 624937 A GB624937 A GB 624937A GB 18672/47 A GB18672/47 A GB 18672/47A GB 1867247 A GB1867247 A GB 1867247A GB 624937 A GB624937 A GB 624937A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- voltage
- transformer
- alternating
- relay
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
- H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
- H02P7/292—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using static converters, e.g. AC to DC
- H02P7/293—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using static converters, e.g. AC to DC using phase control
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stopping Of Electric Motors (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
624,937. Control of D.C. motors. GENERAL ELECTRIC CO., Ltd., and DALE, S. H. July 14, 1947, No. 18672. '[Class 38(iii)] A separately-excited D.C. motor 1 is supplied from A.C. mains through a transformer 7 and two gas-filled, grid-controlled valves 10 and 11 providing full-wave rectification. During normal motor-operation, when there is an alternating-voltage component superimposed upon the direct-voltage developed across supply-lines 6, an alternating-voltage of selected harmonic frequency is obtained across a parallel-connected reactor 17 and condenser 18. This voltage is reduced so that its instantaneous applied to the winding of a contactor 29 through a transformer 25 and rectifier 27 so that a braking resistor 31 is disconnected from the motor. When it is desired to reduce the motor speed the rectifier output voltage is reduced so that its instantaneous peak value becomes less than the motor back-electromotive force. The ripple voltage is removed and the relay 29 is released to connect the motor across the resistor 31 so providing a higher rate of deceleration. This condition continues. until the motorspeed and back-electromotive falls to values allowing the alternating-current component of the rectified voltage to again become effective to open the relay 29. The motor may generate a voltage having an alternating component but the possibility of this causing false operation of the relay 29 is reduced by a suitable arrangement of the resonant-frequency of the circuit elements 17 and 18. Additional contactors which operate in sequence to successively reduce the value of the resistor 31 as the motor-speed falls may be provided. In a modification, Fig. 2 (not shown), the transformer 7 is replaced by one of the threephase type having a delta-connected primary winding and two star-connected secondary windings the star-points of which are connected by an interphase transformer. The ripple voltage developed across this interphase transformer is arranged is arranged to effect control of a motor-braking resistor in a similar manner to that described, the said ripple voltage being removed when the motor-back-electromotive force exceeds the rectifier output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB18672/47A GB624937A (en) | 1947-07-14 | 1947-07-14 | Improvements in or relating to electric motor control systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB18672/47A GB624937A (en) | 1947-07-14 | 1947-07-14 | Improvements in or relating to electric motor control systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB624937A true GB624937A (en) | 1949-06-20 |
Family
ID=10116459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB18672/47A Expired GB624937A (en) | 1947-07-14 | 1947-07-14 | Improvements in or relating to electric motor control systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB624937A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2721968A (en) * | 1950-09-18 | 1955-10-25 | Walter J Brown | Motor control system |
-
1947
- 1947-07-14 GB GB18672/47A patent/GB624937A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2721968A (en) * | 1950-09-18 | 1955-10-25 | Walter J Brown | Motor control system |
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