IEC 63093-8:2018

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

IEC 63093-8:2018 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 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 standard, is discussed in Annex A.
This edition includes the following significant technical changes with respect to IEC 62317-­8:2006 and IEC 60424-3:2015:
a. This document integrates IEC 62317-8:2006 and IEC 60424-3:2015;
b. Table 4 – Allowable areas of chips for E-cores, of IEC 60424-3:2015, has been moved to Annex C (informative) of this document.

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.