IEC 63093-8:2018

Table of 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 E-cores ............................................................................................ 7
4.2.1 Main dimensions .............................................................................................. 7
4.2.2 Effective parameter and Amin values ............................................................... 9
4.3 Dimensional limits for coil formers ........................................................................ 11
5 Limits of surface irregularities ........................................................................................ 15
5.1 General ................................................................................................................. 15
5.2 Examples of surface irregularities ......................................................................... 15
5.3 Chips and ragged edges ....................................................................................... 15
5.3.1 General ......................................................................................................... 15
5.3.2 Chips and ragged edges on the mating surfaces ............................................ 15
5.3.3 Chips and ragged edges on the other surfaces .............................................. 15
5.4 Cracks .................................................................................................................. 18
5.5 Flash .................................................................................................................... 18
5.6 Pull-outs ............................................................................................................... 18
5.7 Crystallites ............................................................................................................ 19
5.8 Pores .................................................................................................................... 19
Annex A (normative) Derived standards ............................................................................... 21
Annex B (normative) Example of dimensions for gauges to check the dimensions of
E-cores complying with this document .................................................................................. 22
B.1 General ................................................................................................................. 22
B.2 Procedure and requirements ................................................................................. 24
Annex C (informative) Reference of allowable areas of chips ............................................... 25
Bibliography .......................................................................................................................... 26
Figure 1 – Dimensions of E-cores with rectangular cross-section ............................................ 7
Figure 2 – Main dimensions of coil formers ........................................................................... 12

Scope

This part of IEC 63093 specifies the dimensions that are of importance for mechanical
interchangeability for a preferred range of E-cores made of ferrite and the essential
dimensions of coil formers to be used with them, as well the effective parameter values to be
used in calculations involving them. It also gives guidelines on allowable limits of surface
irregularities applicable to E-cores.The specifications contained in this document are useful in negotiations between ferrite coremanufacturers and customers about surface irregularities.The use of derived standards, which give more detailed specifications of component parts
while still permitting compliance with this standard, is discussed in Annex A.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	International Electrotechnical Committee
Pages
ISBN
Committee	TC 51