IEC 63093-4-2026 铁氧体磁芯尺寸和表面不规则度限制指南第4部分：RM型磁芯

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IEC 63093-4

Edition 2.0 2026-02

INTERNATIONAL

STANDARD

Ferrite cores - Guidelines on dimensions and the limits of surface irregularities -

Part 4: RM-cores

IEC 63093-4:2026-02(en)

ICS 29.100.10

ISBN 978-2-8327-1015-9

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IEC 63093-4:2026 © IEC 2026

CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 5

3 Terms and definitions ...................................................................................................... 5

4 Primary dimensions ......................................................................................................... 5

4.1 General ................................................................................................................... 5

4.2 Dimensions of RM-cores ......................................................................................... 6

4.2.1 Principal dimensions ........................................................................................ 6

4.2.2 Effective parameter and Amin values ............................................................... 6

4.3 Main dimensions for coil formers ............................................................................. 6

4.3.1 Shape of coil former and pin numbering ........................................................... 6

4.3.2 Dimensions of coil formers for RM-cores for the primary standard ................... 6

4.3.3 RM-cores intended particularly for power applications ..................................... 6

4.4 Pin locations and base outlines ............................................................................... 6

4.5 Spring recess .......................................................................................................... 6

4.6 Stud recess............................................................................................................. 7

5 Mounting ....................................................................................................................... 18

6 Limits of surface irregularities ........................................................................................ 18

6.1 General ................................................................................................................. 18

6.2 Examples of surface irregularities ......................................................................... 18

6.3 Chips and ragged edges ....................................................................................... 18

6.3.1 General ......................................................................................................... 18

6.3.2 Chip and ragged edges located on the mating surface ................................... 18

6.3.3 Chips and ragged edges located on other surfaces ........................................ 19

6.4 Cracks .................................................................................................................. 21

6.5 Pull-out ................................................................................................................. 23

6.6 Crystallites ............................................................................................................ 24

6.7 Flash .................................................................................................................... 24

6.8 Pores .................................................................................................................... 25

Annex A (informative) RM-core design ................................................................................ 26

A.1 General ................................................................................................................. 26

A.2 Pin locations and base outlines ............................................................................. 26

A.3 Design considerations and dimensions ................................................................. 26

A.4 Practical considerations ........................................................................................ 27

Annex B (normative) Guidance for measuring clamping forces relevant to RM-core

tests ..................................................................................................................................... 28

B.1 Test conditions and clamping forces ..................................................................... 28

B.2 Clamping procedure .............................................................................................. 28

Annex C (informative) Examples of allowable areas of chips ............................................... 30

Bibliography .......................................................................................................................... 31

Figure 1 – Dimensions of RM-cores ........................................................................................ 8

Figure 2 – Dimensions of low-profile RM-cores ....................................................................... 9

Figure 3 – Dimensions of spring recess ................................................................................ 11

Figure 4 – Dimensions of stud recess ................................................................................... 12

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摘要：

IEC 63093-4-2026《铁氧体磁芯尺寸和表面不规则度限制指南第4部分：RM型磁芯》是国际电工委员会发布的针对RM型铁氧体磁芯的重要标准规范，主要规定了RM型磁芯的尺寸参数、表面不规则度限制及相关技术要求，为磁芯的设计、制造、检验、采购和选用提供统一依据，适用于电源变压器、电感器、滤波器等电子元器件中的RM型铁氧体磁芯。该标准通过明确尺寸和表面质量限值，有助于提升产品一致性、互换性和可靠性，帮助工程师、质检人员和采购人员准确理解并执行IEC 63093-4-2026要求，是RM型磁芯

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IEC 63093-4-2026 铁氧体磁芯尺寸和表面不规则度限制指南第4部分：RM型磁芯

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