Iec 60424 1 2015

Fer it e cores – Guidel nes on t he l mit s of sur ace ir egularit ies – Part 1: General specificat ion Noy aux fer it es – Lignes direct rices relat ives aux l mit es des ir égularit és

Fer it e cores – Guidel nes on t he l mit s of sur ace ir egularit ies –

Part 1: General specificat ion

Noy aux fer it es – Lignes direct rices relat ives aux l mit es des ir égularit és de

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Fer it e cores – Guidel nes on t he l mit s of sur ace ir egularit ies –

Part 1: General specificat ion

Noy aux fer it es – Lignes direct rices relat ives aux l mit es des ir égularit és de

CONTENTS

FOREWORD 3

INTRODUCTION 5

1 Sco e 6

2 Normative ref eren e 6

3 Terms an def i ition 6

4 Examples of ir eg larities 7

5 L cation an fu ction of core p rts an s r aces 7

5.1 General 7

5.2 Matin s rf aces 7

5.3 Centre p st 8

5.4 Outer wal s or leg 8

5.5 Bac wal, b tom an b c s r aces 8

5.6 Wire-slot are 8

5.7 Wire-way are 8

5.8 Clampin reces are 8

6 Are an len th referen e for vis al in p ction 8

7 Limits of s rf ace ir eg larities 1

7.1 General 1

7.2 Chips an rag ed ed es 1

7.3 Crac s 1

7.4 Flas 1

7.5 Pul-outs 1

7.6 Pores 1

7.7 Cry tal tes 1

8 Sectional sp cification 1

Bibl ogra h 13 Fig re 1 – Examples of s rf ace ir eg larities 7

Fig re 2 – L cation of main core p rts an s r aces – Example of RM-core typ 7

Ta le 1 – Are an len th ref eren e for vis al in p ction 10

Ta le 2 – IEC 6 4 4 sectional sp cification 12

INTERNATIONAL ELECTROTECHNICAL COMMISSION

1 Th Intern tio al Ele trote h ic l Commis io (IEC) is a worldwid org niz tio f or sta d rdiz tio c mprisin

al n tio al ele trote h ic l c mmite s (IEC Natio al Commite s) Th o je t of IEC is to promote

intern tio al c -o eratio o al q e tio s c n ernin sta d rdiz tio in th ele tric l a d ele tro ic field To

this e d a d in a ditio to oth r a tivitie , IEC p bls e Intern tio al Sta d rd , Te h ic l Sp cific tio s,

Te h ic l Re orts, Pu lcly Av ia le Sp cif i atio s (P S) a d Guid s (h re f ter ref ere to a “IEC

Pu lc tio (s)”) Th ir pre aratio is e tru te to te h ic l c mmite s; a y IEC Natio al Commite intere te

in th s bje t d alt with ma p rticip te in this pre aratory work Intern tio al g v rnme tal a d n

n-g v rnme tal org niz tio s laisin with th IEC als p rticip te in this pre aratio IEC c la orate clo ely

with th Intern tio al Org niz tio f or Sta d rdiz tio (ISO) in a c rd n e with c n itio s d termin d b

a re me t b twe n th two org niz tio s

2) Th formal d cisio s or a re me ts of IEC o te h ic l maters e pre s, a n arly a p s ible, a intern tio al

c n e s s of o inio o th rele a t s bje ts sin e e c te h ic l c mmite h s re re e tatio f rom al

intere te IEC Natio al Commite s

3) IEC Pu lc tio s h v th f orm of re omme d tio s f or intern tio al u e a d are a c pte b IEC Natio al

Commite s in th t s n e Whie al re s n ble ef forts are ma e to e s re th t th te h ic l c nte t of IEC

Pu lc tio s is a c rate, IEC c n ot b h ld re p n ible f or th wa in whic th y are u e or for a y

misinterpretatio b a y e d u er

4) In ord r to promote intern tio al u if ormity, IEC Natio al Commite s u d rta e to a ply IEC Pu lc tio s

tra s are tly to th ma imum e te t p s ible in th ir n tio al a d re io al p blc tio s An div rg n e

b twe n a y IEC Pu lc tio a d th c re p n in n tio al or re io al p blc tio s al b cle rly in ic te in

th later

5) IEC its lf d e n t pro id a y ate tatio of c nf ormity In e e d nt c rtif i atio b die pro id c nf ormity

a s s me t s rvic s a d, in s me are s, a c s to IEC mark of c nformity IEC is n t re p n ible f or a y

s rvic s c rie o t b in e e d nt c rtif i atio b die

6) Al u ers s o ld e s re th t th y h v th late t e itio of this p blc tio

7) No la i ty s al ata h to IEC or its dire tors, emplo e s, s rv nts or a e ts in lu in in ivid al e p rts a d

memb rs of its te h ic l c mmite s a d IEC Natio al Commite s for a y p rs n l injury, pro erty d ma e or

9) Ate tio is drawn to th p s ibi ty th t s me of th eleme ts of this IEC Pu lc tio ma b th s bje t of

p te t rig ts IEC s al n t b h ld re p n ible f or id ntifyin a y or al s c p te t rig ts

International Stan ard IEC 6 4 4-1 has b en pre ared IEC tec nical commite 51: Mag etic

comp nents an f er ite materials

This secon edition can els an re laces the f irst edition publ s ed in 19 9 This edition

con titutes a tec nical revision

This edition in lu es the fol owin sig ificant tec nical c an es with resp ct to the previou

edition:

a) ad ition of p res in 3.5 an cry tal tes in 3.6

The text of this stan ard is b sed on the fol owin doc ments:

Ful inf ormation on the votin for the a proval of this stan ard can b fou d in the re ort on

votin in icated in the a ove ta le

This publcation has b en draf ted in ac ordan e with the ISO/IEC Directives, Part 2

A l st of al p rts in the IEC 6 4 4 series, publ s ed u der the general title Ferite c res –

Guideln s o th lmits of sura e ire ularities, can b fou d on the IEC we site

Future stan ard in this series wi car y the new general title as cited a ove Titles of existin

stan ard in this series wi b updated at the time of the next edition

The commite has decided that the contents of this publ cation wi remain u c an ed u ti the

sta i ty date in icated on the IEC we site u der "htp:/we store.iec.c " in the data related to

the sp cific publcation At this date, the publ cation wi b

• with rawn,

• re laced by a revised edition, or

Due to the method of man f acture an the ph sical nature of the prod cts, fer ite cores can b

exp cted to ex ibit some degre of ph sical ir eg larities s c as c ips, rag ed ed es, crac s,

f las in , an pul -out

The p rmis ible extent of these s rf ace ir eg larities wi de en on the typ , p sition an size

of the defect an on the fu ction of the core Th s, in order to esta l s lmits of s rf ace

ir eg larities f or a given series of fer ite cores, f or example RM-cores, p t-cores, E-cores,

U-cores an rin -cores, it is neces ary to pre are a p rtic lar sp cification f or e c , set in out

in detai the p rmis ible extent of the variou typ s of ir eg larities

Al s rf aces of the core s ould b cle n an f re f om lo se fer ite p rticles or an other

f oreig mat er This is more critical f or matin s races that s ould make go d contact with one

another Stain , dis oloration , s rf ace crazin or cry tal zation are ac e ta le if they do not

af fect the normal p rf orman e of the core The ir eg larities des rib d b low are con idered

as b in detecta le without the u e of an mag if yin eq ipment

Sur ace ir eg larities lmits are set f or control of cosmetic a p aran e, an not f or control of

mag etic p rf orman e Sur ace ir eg larities do not s bstantialy aff ect core mag etic f un tion,

nor do they af fect rela i ty Rel a i ty s ould b as es ed for wou d mag etic , rather than

f or cores alone Se IEC 6 4 1-3 f or more detais con ernin the rel a i ty of f er ite cores an

devices buit with them

This stan ard s ould b con idered as a general sp cification u eful in the dialog e b twe n

f er ite core man f acturers an c stomers a out s rf ace ir eg larities

The folowin doc ments, in whole or in p rt, are normatively ref eren ed in this doc ment an

are in isp n a le for its a pl cation F r dated referen es, only the edition cited a ples For

u dated referen es, the latest edition of the ref eren ed doc ment (in lu in an amen ments)

4 Examples of ir egularities

Fig re 1 s ows diff erent examples of s rf ace ir eg larities on an RM-core

Figure 1 – Ex mple of s rf ac ir e ularitie

5 Locations and f unctions of core parts and surf aces

Fig re 2 s ows the location of main core p rts an s r aces on an RM-core

Fig re 2 – Loc tion of main core parts a d s rfa e – Ex mple of RM-core type

5.2 Mating s rfa e

These s races are generaly grou d in order to l mit the resid al air ga b twe n the two core

halves Con eq ently, ir eg larities on these s races have to b con idered as major ones,

an careful y evaluated with regard to their influen e on the mag etic pro erties of the

Ex mpleof f l s

Chip

Ra g d e g s Cra k

5.3 Ce tre post

This s ould b con idered as the most imp rtant p rt of the core d e to its f un tion of car yin

the total f l x generated by the win in The centre p st of fer ite cores is generaly circ lar

(with or without a hole) or rectan ular

5.4 Outer wal s or le s

The main f un tion of the outer wal s (for example p t-cores) or the outer leg (f or example E

-cores) is to g ide the mag etic flu in a closed mag etic circ it

The b c wal has the same mag etic f un tion as the outer wal s or leg ; it may in lu e wi

re-slots an wire-way are s (f or example on RM-cores), the s a es an dimen ion of whic are

dictated by the win in an isolation req irements

Besides ac ommodatin clampin , the b c s r ace (grou d or not serves as a referen e

plane f or grin in the matin s race to ac ieve its req ired p ralel sm, f latnes an

5.6 Wire-slot are

The wire-slot are is the lateral are of the outer wals, interf acin with the c t-out p rtion

The wire-way are is located on the b tom (in ide) s rf ace of the b c wal, also cal ed the

f lo r The wire-way ru s radialy fom the centre p st to the ed e of the b c wal, centred with

resp ct to the wire-slot are s The purp se of the wire-way is to provide a p th for le d to

re c fom the in ide of the coi to terminals on the outside

5.8 Clamping re e s are

The clampin reces are s on the b c wals ac ommodate clampin clps, af fordin sec re

mou tin , an preventin mec anical interf eren e fom the cl p a ove the plane of the b c

wal

6 Are and length ref erenc f or visual inspe tion

Ir eg larities s c as c ips, crac s an pul -out s ould b comp red to five simple ge metries

whic are s own in Ta le 1

Su h a ta le s ould b u ed as a ref eren e f or evaluation by o erators either at the outgoin

stage (core man facturers) or at the in omin in p ction (c stomers)

Other method than vis al in p ction can b u ed, s c as computerized o tical detection

NOT Th minimum are a d le gth c n id re are re p ctiv ly 0,5 mm

b) f or len th

– 1 mm fom 1 mm to 5 mm

– 2,5 mm f rom 5 mm to 10 mm

Table 1 – A re a d le gth ref ere c f or vis al inspe tion

IE C

7 Limits of surf ace ir egularities

In e c p rtic lar sp cif i ation relevant to a stan ardized core series, generic rules f or the

calc lation of lmits s ould b def i ed for every kin of ir eg larity an for al core p rts an

s rf aces

For g idan e on the l mits of ir eg larities, ref er to the sectional sp cification of IEC 6 4 4-2

to IEC 6 4 4-8, where lmits p r core size are given in s ita le ta les, alon with identif i ation

of ir eg larity typ s on fig res an drawin s

7.2 Chips a d ra g d e ge

The simplest way of p r ormin in p ction on these two typ s of ir eg larities is to comp re a

c ip to a referen e are lmit an a rag ed ed e to a ref eren e len th

The l mits of c ips are generaly def i ed as a p rcentage of the related s race of the core

The a p rent are of a c ip is con idered to b the are of that c ip

The rag ed ed e len th is generaly l mited to a p rcentage of the common p rimeter of the

resp ctive two s rf aces

The l mits of pul -outs are general y def i ed as a p rcentage of the resp ctive s race are

The a p rent are of a pul-out, neglectin actual de th, is con idered to b the are of that

pul-out

The l mits of p res are general y def i ed as a p rcentage of the sp cif ied core

7.7 Cry tal ite

The l mits of cry tal tes are generaly defined as a p rcentage of the sp cified core

8 Sectional specif ications

Table 2 – IEC 6 4 4 s ction l spe ific tions

IEC 6 4 4-6 (uture) Ferite c re – Guid ln s o th lmits of s rf ac ire ularitie – Part 6: Pot-c re

IEC 6 4 4-7 (uture) Ferite c re – Guid ln s o th lmits of s rf ac ire ularitie – Part 7: EP-c re

IEC 6 4 4-8 Ferite c re – Guid ln s o th lmits of s ra e ire ularitie – Part 8: PQ-c re

Bibl ogr aphy

[1] IEC 6 4 1-3, Terms a d n me clature for c res made of ma n tic ly soft ferites –

P art 3: Guideln s o the format of data a p arin in ma ufa turers' c talo u s of

tra sformer a d indu tor c res

[2] IEC 6 4 4-2, Ferite c res – Guideln s o th lmits of sura e ire ularities of ferite

c res – P art 2: RM-c res

[3] IEC 6 4 4-3, Ferite c res – Guideln s o the lmits of sura e ire ularities – P art 3:

ET -c res, EER-c res, EC-c res a d E-c res

[4] IEC 6 4 4-4, Ferite c res – Guideln s o th lmits of sura e ire ularities – P art 4:

Rin -c res

[5] IEC 6 4 4-8, Ferite c res – Guideln s o the lmits ofsura e ire ularities – P art 8:

_ _ _ _ _ _