GB512195A - Improvements in and relating to electric motor control systems - Google Patents

Improvements in and relating to electric motor control systems

Info

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
Application number
GB22962/38A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB512195A publication Critical patent/GB512195A/en
Expired legal-status Critical Current

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.
GB22962/38A 1937-08-05 1938-08-03 Improvements in and relating to electric motor control systems Expired GB512195A (en)

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)

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