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IEC 60401-1
Edition 2.0 2020-04
INTERNATIONAL
STANDARD
Terms and nomenclature for cores made of magnetically soft ferrites –
Part 1: Terms used for physical irregularities and reference of dimensions
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IEC 60401-1
Edition 2.0 2020-04
INTERNATIONAL
STANDARD
Terms and nomenclature for cores made of magnetically soft ferrites –
Part 1: Terms used for physical irregularities and reference of dimensions
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.100.10 ISBN 978-2-8322-8081-2
– 2 – IEC 60401-1:2020 © IEC 2020
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Physical irregularities . 7
4.1 General overview . 7
4.2 General terms for physical irregularities . 8
4.3 Surface irregularities . 8
4.3.1 Chip irregularities . 8
4.3.2 Protruding (convex) irregularities . 10
4.3.3 Edge irregularities . 11
4.3.4 Crack irregularities . 11
4.3.5 Colour irregularities . 13
4.3.6 Machining-related irregularities . 15
4.4 Interior irregularities . 16
4.5 Shape irregularities (deformations) . 16
4.5.1 Non-flat irregularities . 16
4.5.2 Simple geometry irregularities . 18
4.5.3 Grinding related irregularities. 20
4.5.4 Other shape irregularities . 20
5 Reference of dimensions . 21
5.1 General specifications . 21
5.2 Dimension descriptions . 21
5.3 Core illustrations . 22
Annex A (informative) Location related terms . 26
A.1 General . 26
A.2 Surfaces . 26
A.3 Shape . 27
A.4 Specific parts location qualifiers . 27
Figure 1 – Surface chip . 9
Figure 2 – Edge chip . 9
Figure 3 – Corner chip . 9
Figure 4 – Pull-out . 10
Figure 5 – Pores . 10
Figure 6 – Hump . 10
Figure 7 – Attached particle . 10
Figure 8 – Ragged edge . 11
Figure 9 – Flash . 11
Figure 10 – Single-surface narrow crack . 11
Figure 11 – Single-surface broad crack . 12
Figure 12 – Edge narrow crack . 12
Figure 13 – Edge broad crack . 12
Figure 14 – Inner channel crack . 13
Figure 15 – Lamination . 13
Figure 16 – Crazing . 13
Figure 17 – Difference in colour tones. 14
Figure 18 – Discoloration . 14
Figure 19 – Stain . 14
Figure 20 – Crystallite . 14
Figure 21 – Roughness . 15
Figure 22 – Short-ground surface. 15
Figure 23 – Scratch . 15
Figure 24 – Convexity . 16
Figure 25 – Concavity . 16
Figure 26 – Warping . 16
Figure 27 – Deflection-out . 17
Figure 28 – Deflection-in . 17
Figure 29 – Transverse deflection . 17
Figure 30 – Undulation . 18
Figure 31 – Non-parallelism . 18
Figure 32 – Non-perpendicularity . 18
Figure 33 – Non-coplanarity . 18
Figure 34 – Non-circularity . 19
Figure 35 – Ovality . 19
Figure 36 – Non-concentricity of co-planar circles . 19
Figure 37 – Non-concentricity of circles lying on two planes . 20
Figure 38 – Steplike ground surface . 20
Figure 39 – Uneven grinding slant. 20
Figure 40 – Un-matching . 21
Figure 41 – Profile deformation . 21
Figure 42 – Ring-cores . 22
Figure 43 – E-core . 22
Figure 44 – ETD- or EER-core . 23
Figure 45 – EC-core. 23
Figure 46 – Planar E-core . 23
Figure 47 – Planar EL-core . 23
Figure 48 – Planar ER-core . 23
Figure 49 – Plate-core mating planar cores . 23
Figure 50 – EFD-core . 24
Figure 51 – Drum-core . 24
Figure 52 – EP-core . 24
Figure 53 – PQ-core . 24
Figure 54 – Pot-core and half pot-core for inductive proximity switches . 24
Figure 55 – PM-core . 24
Figure 56 – RM-core . 25
Figure 57 – U-core . 25
– 4 – IEC 60401-1:2020 © IEC 2020
Figure 58 – UR-core . 25
Figure 59 – Balun-core .
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