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IEC 60740-1:2005

Current
Current

The latest, up-to-date edition.

Laminations for transformers and inductors - Part 1: Mechanical and electrical characteristics
Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English, English - French

Published date

09-08-2005

FOREWORD
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Materials and lamination thicknesses
   4.1 Materials
   4.2 Nominal lamination thickness
   4.3 Minimum stacking factor
5 Designation of laminations and lamination strips
   5.1 Specified complete shapes
   5.2 Lamination strips for specified shapes
   5.3 Lamination strips for non-specified laminations
6 Packing and marking
7 Electrical tests
   7.1 General
   7.2 Core constants
   7.3 Magnetic path length
   7.4 Core cross-section
8 General conditions for electrical measurements
   8.1 Atmospheric conditions
   8.2 Test coils
   8.3 Test cores
   8.4 Harmonic content of the voltage
9 Measurements at high field strength
   9.1 General
   9.2 Measurement of power loss
   9.3 Measurement of total apparent power
10 Measurements at low and medium field strength
   10.1 General
   10.2 Measurement of amplitude permeability
11 Preferred ranges of laminations
12 Dimensions and tolerances
   12.1 Dimensions
   12.2 Tolerances
   12.3 Symmetry tolerances
13 Dimensions and effective parameters
   13.1 General
   13.2 Lamination strips Type YS
   13.3 Laminations Type YEI 1
   13.4 Laminations Type YUI 1
   13.5 Lamination Types YUI 2
   13.6 Lamination Types YEx 2, YEE 2 and YEI 2
   13.7 Lamination Types YEE 2-L
   13.8 Lamination Types YEx 3, YEE 3, YEF 3, YEI 3 and YEL 3
   13.9 Lamination Types YEx 4, YEE 4 and YEF 4
   13.10 Laminations Type YM 1
14 Electrical characteristics for materials
15 Specific total apparent power for laminations
16 Specific power loss for laminations
17 Mechanical characteristics for laminations
   17.1 General appearance and conditions
   17.2 Cut and punch edge
   17.3 Camber
   17.4 Distortion
   17.5 Bending
   17.6 Insulation
   17.7 Welding
Annex A (informative) Conversion of polarisation and field
                      strength into specific total apparent
                      power
   A.1 Specific total apparent power from polarisation and
         field strength
   A.2 Equations for the curves of the magnetic materials
   A.3 Constants for non-oriented silicon steel C 21
   A.4 Specific reactive power and specific power loss for
         non-oriented silicon steel C 21
   A.5 Constants for grain-oriented silicon steel C 22
   A.6 Specific reactive power and specific power loss for
         grain-oriented silicon steel C 22
   A.7 Influence of the shape on the electrical
         characteristics for grain-oriented silicon steel
         C 22
Bibliography

IEC 60740-1:2005 specifies the characteristics of laminations. Their preferred use is cores for transformers and inductors. The laminations are made of sheets and strips of magnetic materials, specified in IEC 60404-8-4 and IEC 60404-8-7. The main changes are listed below:
a) ranges with lamination strips YS, YSUI 1, YSUI 2 and laminations YEE 2-..L added;
b) range YEI 1 extended at the above end;
c) ranges YED 2, YEF 2, YEL 2, YES 2, Type YM 1-5a and YM 1-7a cancelled;
d) national designations cancelled;
e) electrical characteristics for the laminations specified;
f) mechanical characteristics for laminations added;
g) holes added for lamination types YEI 1, YUI 1, YUI 2, YM 1;
h) in Annex A, a conversion of the polarisation J and the field strength H in a specific total apparent power is defined. For the characteristics of the reactive power and the power loss, equations and constants are specified.

Committee
TC 51
DevelopmentNote
Supersedes IEC 60740 (08/2005) A Bilingual edition has been published. (11/2011) Stability Date: 2020. (09/2017)
DocumentType
Standard
Pages
59
PublisherName
International Electrotechnical Committee
Status
Current

IEC 61021-1:1990 Laminated core packages for transformers and inductors used in telecommunication and electronic equipment - Part 1: Dimensions
IEC 61797-1:1996 Transformers and inductors for use in telecommunication and electronic equipment - Main dimensions of coil formers - Part 1: Coil formers for laminated cores
IEC 60050-221:1990 International Electrotechnical Vocabulary (IEV) - Part 221: Magnetic materials and components
IEC 60740-2:1993 Laminations for transformers and inductors for use in telecommunication and electronic equipment - Part 2: Specification for the minimum permeabilities of laminations made of soft magnetic metallic materials
IEC 61021-2:1995 Laminated core packages for transformers and inductors for use in telecommunication and electronic equipment - Part 2: Electrical characteristics for cores using YEE2 laminations
IEC 60404-8-4:2013 Magnetic materials - Part 8-4: Specifications for individual materials - Cold-rolled non-oriented electrical steel strip and sheet delivered in the fully-processed state
ISO 286-1:2010 Geometrical product specifications (GPS) ISO code system for tolerances on linear sizes Part 1: Basis of tolerances, deviations and fits
IEC 60404-8-7:2017 Magnetic materials - Part 8-7: Specifications for individual materials - Cold-rolled grain-oriented electrical steel strip and sheet delivered in the fully processed state
IEC 60404-1:2016 Magnetic materials - Part 1: Classification
IEC 60404-11:1991+AMD1:1998+AMD2:2012 CSV Magnetic materials - Part 11: Method of test for the determination of surface insulation resistance of magnetic sheet and strip

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