GB643771A - Improvements in or relating to control systems for direct current electric motors - Google Patents
Improvements in or relating to control systems for direct current electric motorsInfo
- Publication number
- GB643771A GB643771A GB4044/48A GB404448A GB643771A GB 643771 A GB643771 A GB 643771A GB 4044/48 A GB4044/48 A GB 4044/48A GB 404448 A GB404448 A GB 404448A GB 643771 A GB643771 A GB 643771A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- voltage
- current
- rectifiers
- characteristic
- 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)
- Particle Accelerators (AREA)
- Control Of Linear Motors (AREA)
- Ac-Ac Conversion (AREA)
Abstract
643,771. Automatic speed control systems. GENERAL ELECTRIC CO., Ltd., and DALE, S. H. Feb. 11, 1948, No. 4044. [Class 38 (iv)] [Also in Group XXXVII] A speed control circuit for a D.C. motor supplied by grid controlled rectifiers, includes a non-linear thermionic amplifier which compensates for the non-linearity of the speed/loadcurrent characteristic of the motor. Transformer 8 and rectifiers 3 and 4, connected for full-wave rectification, supply a shunt or separately excited D.C. motor 1. The D.C. voltage is, controlled by the rectifier grids being connected to a phase shifting network 15 which includes a saturable reactor 16 controlled by a triode 17 directly coupled to a second triode 26. The grid-cathode voltage of this valve is the resultant of the rectifier output voltage, an adjustable reference voltage tapped off a battery 23, and a voltage appearing across resistor 21. This voltage increases non-linearly with increase in motor load current since a voltage proportional to motor current is obtained either from current transformer connected in the anode circuits of the rectifiers, or from a device 30 which comprises a pair of saturable reactors controlling an A.C. supply according to the D.C. load current, and applied in opposition to a reference source 29 to the control grid of a, variable-mu tetrode 28 which is operated over a suitably curved portion of the Ia/Vg characteristic. Thus the rectifier output rises with increase in load current and compensates for the non-linear drooping speed/ load-current characteristic of the motor. Specification 663,772 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4044/48A GB643771A (en) | 1948-02-11 | 1948-02-11 | Improvements in or relating to control systems for direct current electric motors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4044/48A GB643771A (en) | 1948-02-11 | 1948-02-11 | Improvements in or relating to control systems for direct current electric motors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB643771A true GB643771A (en) | 1950-09-27 |
Family
ID=9769684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4044/48A Expired GB643771A (en) | 1948-02-11 | 1948-02-11 | Improvements in or relating to control systems for direct current electric motors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB643771A (en) |
-
1948
- 1948-02-11 GB GB4044/48A patent/GB643771A/en not_active Expired
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