GB512195A - Improvements in and relating to electric motor control systems - Google Patents
Improvements in and relating to electric motor control systemsInfo
- Publication number
- GB512195A GB512195A GB22962/38A GB2296238A GB512195A GB 512195 A GB512195 A GB 512195A GB 22962/38 A GB22962/38 A GB 22962/38A GB 2296238 A GB2296238 A GB 2296238A GB 512195 A GB512195 A GB 512195A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- resistance
- switch
- contacts
- motor
- 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
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor And Converter Starters (AREA)
Abstract
512,195. Control of A.C. motors. BRITISH THOMSON-HOUSTON CO., Ltd. Aug. 3, 1938, No. 22962. Convention date, Aug. 5, 1937. [Class 38 (iii)] A synchronous motor 1 is started with its field 3 connected in a closed circuit with a resistance 6, and the field is connected to a direct current source when the motor has run up to speed by means of a switch 7 controlled by a relay 11 which relay is connected through a half-wave rectifier 10 between a point on the resistance 6 and the junction of a resistance 17 and a condenser 16, which latter are connected in series across the resistance 6. The motor is connected to the supply by a switch 4 which in closing energises a relay 14 to close contacts 13 after a time interval. The relay 11 holds its contacts open until the frequency of the current in the resistance 6 falls to a predetermined value, whereupon it closes its contacts to energise the operating coil 9 of the switch 7 over the contacts of the relay 14: The switch 7 thereupon effects excitation of the motor field. The current in the coil of the relay 11 leads that in the resistance 6 so that the switch 7 operates at a favourable point in cycle of slip current. Specification 384,567, [Group XXXV], is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US512195XA | 1937-08-05 | 1937-08-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB512195A true GB512195A (en) | 1939-08-30 |
Family
ID=21970015
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB22962/38A Expired GB512195A (en) | 1937-08-05 | 1938-08-03 | Improvements in and relating to electric motor control systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB512195A (en) |
-
1938
- 1938-08-03 GB GB22962/38A patent/GB512195A/en not_active Expired
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