GB658965A - Apparatus for synchronising a.c. machines - Google Patents

Apparatus for synchronising a.c. machines

Info

Publication number
GB658965A
GB658965A GB32824/47A GB3282447A GB658965A GB 658965 A GB658965 A GB 658965A GB 32824/47 A GB32824/47 A GB 32824/47A GB 3282447 A GB3282447 A GB 3282447A GB 658965 A GB658965 A GB 658965A
Authority
GB
United Kingdom
Prior art keywords
winding
switch
motors
phase
degrees
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
GB32824/47A
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.)
SHAFI UDDIN AHMED CHOUDHURY
British Thomson Houston Co Ltd
Original Assignee
SHAFI UDDIN AHMED CHOUDHURY
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 SHAFI UDDIN AHMED CHOUDHURY, British Thomson Houston Co Ltd filed Critical SHAFI UDDIN AHMED CHOUDHURY
Priority to GB32824/47A priority Critical patent/GB658965A/en
Publication of GB658965A publication Critical patent/GB658965A/en
Expired legal-status Critical Current

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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Stepping Motors (AREA)

Abstract

658,965. Control of several A.C. motors. BRITISH THOMSON - HOUSTON CO., Ltd., and CHOUDHURY, S. U. A. Dec. 12, 1947, No. 32824. [Class 38(iii)] [Also in Group XXXVIII] Where two or more A.C. machines having their polyphase secondary windings interconnected for synchronism when running or at standstill they may not experience sufficient synchronising torque if the interconnected winding systems of two machines are 180 degrees phase displaced. To ensure synchronism single-phase excitation is simultaneously applied to the primary elements at least one of which has a three-phase winding so that by a simple switching operation its field axis may be displaced by 30 degrees. Fig. 1 shows the primary windings 1, 3 of two slip ring motors adapted for three-phase excitation the secondary winding being interconnected. Single-phase excitation is first applied by closing switches 11a, 12a, a normally closed switch 14a placing a quadrature shunt on winding 3, so that the field axis of the two motors will be mutually displaced 30 degrees. A switch 15a is then closed to place a like shunt on winding 1 and bring the field axes into alignment. The motors will then have been pulled into synchronism and, to establish polyphase excitation, switch 13a is closed as switch 14a is opened. Specification 643,360 is referred to.
GB32824/47A 1947-12-12 1947-12-12 Apparatus for synchronising a.c. machines Expired GB658965A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB32824/47A GB658965A (en) 1947-12-12 1947-12-12 Apparatus for synchronising a.c. machines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB32824/47A GB658965A (en) 1947-12-12 1947-12-12 Apparatus for synchronising a.c. machines

Publications (1)

Publication Number Publication Date
GB658965A true GB658965A (en) 1951-10-17

Family

ID=10344541

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32824/47A Expired GB658965A (en) 1947-12-12 1947-12-12 Apparatus for synchronising a.c. machines

Country Status (1)

Country Link
GB (1) GB658965A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864041A (en) * 1955-04-21 1958-12-09 British Thomson Houston Co Ltd Operation of dynamo-electric machines in mutual synchronism
US2864045A (en) * 1954-03-28 1958-12-09 British Thomson Houston Co Ltd Single phase power selsyn drive
US3107577A (en) * 1960-11-21 1963-10-22 Walt Disney Prod Panoramic motion picture projection apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864045A (en) * 1954-03-28 1958-12-09 British Thomson Houston Co Ltd Single phase power selsyn drive
US2864041A (en) * 1955-04-21 1958-12-09 British Thomson Houston Co Ltd Operation of dynamo-electric machines in mutual synchronism
US3107577A (en) * 1960-11-21 1963-10-22 Walt Disney Prod Panoramic motion picture projection apparatus

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