Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 7: EER-cores

IEC 63093-7:2018(E) specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of EER-cores made of ferrite, the essential dimensions of coil formers to be used with them as well the effective parameter values to be used in calculations involving them, and gives guidelines on allowable limits of surface irregularities applicable to EER-cores.
This document is a specification useful in the negotiations between ferrite core manufacturers and customers about surface irregularities.
The use of “derived” standards which give more detailed specifications of component parts while still permitting compliance with this document is discussed in Annex A.
This first edition cancels and replaces the first edition of IEC 62317-7 published in 2005. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC 62317-7:
a) IEC 63093-7 integrates IEC 62317-7 and IEC 60424-3;
b) IEC 60424-3:2015, Table 2, has been included in Annex C as Table C.1.

General Information

Status
Published
Publication Date
21-Mar-2018
Current Stage
PPUB - Publication issued
Start Date
22-Mar-2018
Completion Date
22-Mar-2018
Ref Project

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IEC 63093-7
Edition 1.0 2018-03
INTERNATIONAL
STANDARD
Ferrite cores – Guidelines on dimensions and the limits of surface
irregularities –
Part 7: EER-cores
IEC 63093-7:2018-03(en)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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---------------------- Page: 2 ----------------------
IEC 63093-7
Edition 1.0 2018-03
INTERNATIONAL
STANDARD
Ferrite cores – Guidelines on dimensions and the limits of surface
irregularities –
Part 7: EER-cores
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.100.10 ISBN 978-2-8322-5485-1

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 63093-7:2018 © IEC 2018
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

4 Primary dimensions ......................................................................................................... 6

4.1 General ................................................................................................................... 6

4.2 Dimensions of EER-cores ....................................................................................... 7

4.2.1 Principal dimensions ...................................................................................... 7

4.2.2 Effective parameter and A values ............................................................. 8

min

4.3 Dimensional limits for coil formers........................................................................... 8

5 Limits of surface irregularities .......................................................................................... 9

5.1 General ................................................................................................................... 9

5.2 Chips and ragged edges ....................................................................................... 10

5.2.1 General........................................................................................................ 10

5.2.2 Chips and ragged edges on the mating surfaces (see Figure 4) ................... 10

5.2.3 Chips and ragged edges on the other surfaces (see Figure 4) ..................... 10

5.3 Cracks .................................................................................................................. 12

5.4 Flash .................................................................................................................... 12

5.5 Pull-outs ............................................................................................................... 12

5.6 Crystallites ............................................................................................................ 13

5.7 Pores .................................................................................................................... 14

Annex A (normative) Derived standards ............................................................................... 15

Annex B (normative) Example of dimensions for gauges to check the dimensions of

EER-cores meeting this primary standard ............................................................................. 16

B.1 General ................................................................................................................. 16

B.2 Procedure and requirements ................................................................................. 16

Annex C (informative) Examples of allowable areas of chips ................................................ 17

Bibliography .......................................................................................................................... 18

Figure 1 – Dimensions of EER-cores ...................................................................................... 7

Figure 2 – Essential dimensions of coil formers ...................................................................... 8

Figure 3 – Examples of surface irregularities .......................................................................... 9

Figure 4 – Chip locations for EER-cores ............................................................................... 10

Figure 5 – Cracks and pull-out locations for EER-cores ........................................................ 12

Figure 6 – Crystallite location for EER-cores ......................................................................... 13

Figure 7 – Pore location for EER-cores ................................................................................. 14

Figure B.1 – Gauge dimensions ............................................................................................ 16

Table 1 – Dimensions of EER-cores ........................................................................................ 7

Table 2 – Effective parameter values of EER-cores ................................................................ 8

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IEC 63093-7:2018 © IEC 2018 – 3 –

Table 3 – Dimensional limits for coil formers ........................................................................... 9

Table 4 – Area and length reference for visual inspection ..................................................... 11

Table 5 – Limits for cracks .................................................................................................... 13

Table B.1 – Gauge dimensions ............................................................................................. 16

Table C.1 – Allowable areas of chips for EER-cores ............................................................. 17

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– 4 – IEC 63093-7:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FERRITE CORES – GUIDELINES ON DIMENSIONS AND
THE LIMITS OF SURFACE IRREGULARITIES –
Part 7: EER-cores
FOREWORD

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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 63093-7 has been prepared by IEC technical committee 51:

Magnetic components, ferrite and magnetic powder materials.

This first edition cancels and replaces the first edition of IEC 62317-7 published in 2005. This

edition constitutes a technical revision. This edition includes the following significant technical

changes with respect to IEC 62317-7:
a) IEC 63093-7 integrates IEC 62317-7 and IEC 60424-3;
b) IEC 60424-3:2015, Table 2, has been included in Annex C as Table C.1.
---------------------- Page: 6 ----------------------
IEC 63093-7:2018 © IEC 2018 – 5 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
51/1217/FDIS 51/1226/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 63093 series, published under the general title Ferrite cores –

Guidelines on dimensions and the limits of surface irregularities can be found on the IEC

website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch"
...

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