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