GB1253364A - Improvements in or relating to three-phase squirrel-cage induction motors - Google Patents

Improvements in or relating to three-phase squirrel-cage induction motors

Info

Publication number
GB1253364A
GB1253364A GB3095768A GB3095768A GB1253364A GB 1253364 A GB1253364 A GB 1253364A GB 3095768 A GB3095768 A GB 3095768A GB 3095768 A GB3095768 A GB 3095768A GB 1253364 A GB1253364 A GB 1253364A
Authority
GB
United Kingdom
Prior art keywords
slots
coils
degrees
motor
phase
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
GB3095768A
Inventor
William Fong
Gordon Hindle Rawcliffe
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.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
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 National Research Development Corp UK filed Critical National Research Development Corp UK
Priority to GB3095768A priority Critical patent/GB1253364A/en
Publication of GB1253364A publication Critical patent/GB1253364A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H02K1/165—Shape, form or location of the slots
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

1,253,364. Induction motors; core constructions. NATIONAL RESEARCH DEVELOPMENT CORP. 23 June, 1969 [28 June, 1968], No. 30957/68. Heading H2A. In a three-phase squirrel cage induction motor of low shaft height, a portion of the outer periphery of the stator core is cut away, the adjacent sector of the internal stator periphery is unslotted, a diametrically opposite peripheral sector of approximately 180 degrees extent is formed with slots of uniform depth and the intermediate sectors are formed with slots of smaller depth. The cut-away portion 6 subtends an angle of between 50 and 90 degrees at the motor axis (80 degrees in Fig. 2) and the unslotted peripheral sector subtends at the axis an angle not greater than half that amount (20 degrees in Fig. 2). As opposed to a conventional 4 pole, three-phase motor having 36 slots occupied by 36 coils, 12 per phase, the motor of the invention omits three coils per phase, 21 of the remaining coils being placed in 21 slots 5 of uniform depth, and 12 half coils in 12 slots 5<SP>1</SP> half the depth of the slots 5, all of the coils being pitched 2/ 3 full pitch. Alternatively, a different number of coils may be omitted from the different phases, as long as the phases are wound to have the same total number of turns.
GB3095768A 1968-06-28 1968-06-28 Improvements in or relating to three-phase squirrel-cage induction motors Expired GB1253364A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3095768A GB1253364A (en) 1968-06-28 1968-06-28 Improvements in or relating to three-phase squirrel-cage induction motors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3095768A GB1253364A (en) 1968-06-28 1968-06-28 Improvements in or relating to three-phase squirrel-cage induction motors

Publications (1)

Publication Number Publication Date
GB1253364A true GB1253364A (en) 1971-11-10

Family

ID=10315738

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3095768A Expired GB1253364A (en) 1968-06-28 1968-06-28 Improvements in or relating to three-phase squirrel-cage induction motors

Country Status (1)

Country Link
GB (1) GB1253364A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0025297A1 (en) * 1979-08-28 1981-03-18 National Research Development Corporation Improvements in electrical machines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0025297A1 (en) * 1979-08-28 1981-03-18 National Research Development Corporation Improvements in electrical machines

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