GB721686A - Improvements in or relating to electric motor control systems - Google Patents
Improvements in or relating to electric motor control systemsInfo
- Publication number
- GB721686A GB721686A GB1988/52A GB198852A GB721686A GB 721686 A GB721686 A GB 721686A GB 1988/52 A GB1988/52 A GB 1988/52A GB 198852 A GB198852 A GB 198852A GB 721686 A GB721686 A GB 721686A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- generator
- motor
- winding
- field
- 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
- 238000004804 winding Methods 0.000 abstract 9
- 230000005284 excitation Effects 0.000 abstract 3
- 230000001419 dependent effect Effects 0.000 abstract 2
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
- H02P7/34—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 Ward-Leonard arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Direct Current Motors (AREA)
Abstract
721,686. Automatic speed-control systems. IGRANIC ELECTRIC CO., Ltd. Jan. 24, 1952 [Feb. 23, 1951], No. 1988/52. Class 38 (4). A D.C. motor 5, Fig. 1, of a Ward-Leonard set is supplied from a D.C. generator 1 driven by a three-phase motor 9 supplied from an A.C. source L<SP>1</SP>, L<SP>2</SP>, L<SP>3</SP>. Generator voltage and hence motor speed is controlled by a main generator field winding 10 supplied with D.C. from the A.C. source through rectifiers 16-19 and windings 14, 15 of a saturable reactor 13. The excitation of generator field winding 10 is automatically controlled by applying to a control winding 20 of saturable reactor 13 a first voltage, between a point X and the slider of a potentiometer 25, in opposition to a second voltage, between point X and the slider of a rheostat 21. The first voltage, being the addition of that portion of the generator voltage selected by the appropriately set potentiometer 25 and a voltage dependent on motor current developed across a resistor 24, is representative of motor speed. The second voltage is a reference voltage selected from the output of a rectifier 22 by rheostat 21 which serves to set the speed which the system is to maintain. A second generator field winding 11, energized from rectifier 22, provides constant weak opposition to field winding 10 so that the total field may be reduced to a lower level and a greater speed range obtained by operation of rheostat 21. A further control winding 26 on saturable reactor 13 provides an anti-hunt feedback dependent on rate of change of excitation of field winding 10. Another control winding 27 is energized in dependence on the voltage across resistor 24 to provide further compensation for armature volt-drop. Obtaining the voltage representative of motor speed from a tachometer generator and automatic regulation of the excitation of motor field 31 in dependence on field circuit voltage or tachometer generator voltage by means involving a magnetic amplifier are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US721686XA | 1951-02-23 | 1951-02-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB721686A true GB721686A (en) | 1955-01-12 |
Family
ID=22106000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1988/52A Expired GB721686A (en) | 1951-02-23 | 1952-01-24 | Improvements in or relating to electric motor control systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB721686A (en) |
-
1952
- 1952-01-24 GB GB1988/52A patent/GB721686A/en not_active Expired
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