GB756980A - Improvements in or relating to protective systems for direct current motors - Google Patents
Improvements in or relating to protective systems for direct current motorsInfo
- Publication number
- GB756980A GB756980A GB6495/54A GB649554A GB756980A GB 756980 A GB756980 A GB 756980A GB 6495/54 A GB6495/54 A GB 6495/54A GB 649554 A GB649554 A GB 649554A GB 756980 A GB756980 A GB 756980A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- rheostat
- motor
- control
- relating
- 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
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/093—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against increase beyond, or decrease below, a predetermined level of rotational speed
Landscapes
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
756,980. Control of D.C. motors. IGRANIC ELECTRIC CO., Ltd. March 5, 1954 [March 6, 1953], No. 6495/54. Class 38(3) A protective relay 18 for interrupting the power connections to a shunt motor 10 in the event of excessive reduction of field excitation has one coil 18a connected in series with the shunt field winding 14 and control rheostat 22. A second coil 18b of the relay exerts a force which aids that of the coil 18a and is connected, after the motor has started across the rheostat 22. and control rheostat 22. A second coil 18b is thus substantially constant regardless of the speed adjustment of the rheostat 22. If, however, the field current decreases while the speed adjustment remains unchanged, the combined effect of the relay coils diminishes and the power connecions of the motor are interrupted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US756980XA | 1953-03-06 | 1953-03-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB756980A true GB756980A (en) | 1956-09-12 |
Family
ID=22127425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6495/54A Expired GB756980A (en) | 1953-03-06 | 1954-03-05 | Improvements in or relating to protective systems for direct current motors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB756980A (en) |
-
1954
- 1954-03-05 GB GB6495/54A patent/GB756980A/en not_active Expired
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