Iec 60424 5 2009

IEC 60424 5 Edition 1 0 2009 02 INTERNATIONAL STANDARD Ferrite cores – Guide on the l imits of surface irregularities – Part 5 Planar cores IE C 6 0 4 2 4 5 2 0 0 9 (E ) ® THIS PUBLICATION IS COPYRIGH[.]

IEC 60424-5 ® Ed i ti on I N TERN ATI ON AL STAN DARD Ferri te cores – G u i de on th e l i m i ts of su rface i rreg u l ari ties – I E C 6042 4-5: 009(E ) Part 5: Plan ar-cores 2009-02 TH I S P U B LI C ATI O N I S C O P YRI G H T P RO TE C TE D C o p yri g h t © 0 I E C , G e n e v a , S wi tz e rl a n d Al l ri g h t s or by re s e rv e d an y m ean s, e i th e r I EC If h a ve yo u p l e a se I EC 3, or I EC's an y co n ta ct C e n t l ru e de U nl ess o t h e rwi s e e l e c t ro n i c m em ber q u e s ti o n s th e or N a ti o n a l abou t a d d re s s s p e c i fi e d , m e c h a n i ca l , I EC b el ow or no C o m m i tte e c o p yri g h t yo u r p a rt i n cl u d i n g l o ca l in or th e th i s p u b l i c a ti o n co u n t ry h a ve IEC of p h o t o c o p yi n g an of th e e n q u i ry m em ber and m ay be re p ro d u ce d m i c ro fi l m , wi t h o u t or u ti l i ze d p e rm i s s i o n in an y fo rm wri t i n g in fro m re q u e s t e r abou t N a ti o n a l o b ta i n i n g C o m m i tte e a d d i ti o n a l fo r fu rt h e r ri g h ts to th i s p u b l i ca t i o n , i n fo rm a t i o n O ffi c e V a re m b é CH -1 1 G e n e va 20 S wi t z e rl a n d Email : i n m a i l @i e c ch www i e c ch Web: Ab o u t th e I E C Th e I n t e rn a t i o n a l I n t e rn a t i o n a l E l e c t ro t e c h n i ca l S t a n d a rd s fo r al l Com m i ssi on e l e c t ri c a l , (I E C) e l e c t ro n i c is and th e re l a t e d l ea d i n g g l oba l o rg a n i z a t i o n th a t p re p a re s an d pu bl i sh e s te ch n o l o g i e s Ab o u t I E C p u b l i c a ti o n s Th e te ch n i ca l l a te s t  C a ta l o g u e Th e It  e d i ti o n , I EC al so I EC S ta y J u st on -l i n e  If IEC i n fo rm a t i o n on a l so wo rl d ' s En g li sh and C e n t re Email : wi s h F AQ an ke p t un d er might co n s ta n t h a ve b e en re v i e w by th e I EC Pl ease m a ke s u re th a t yo u h a ve th e p u b l i sh e d w w w i e c c h /s e a rc h p u b en a bl e s on is am en d m en t yo u p ro j e c t s , to s e a rc h wi t h d wn by an d a v a ri e t y re p l a c e d of c ri t e ri a ( re fe re n ce n u m b e r, t e xt , te c h n i ca l c o m m i tte e , … ) p u b l i c a ti o n s ww w i e c c h / o n l i n e _n e ws /j u s t p u b new I EC p u b l i c a ti o n s J u st Pu bli sh ed d e ta i l s t wi c e a m o n th al l n ew p u b l i c a ti o n s re l e a s e d Ava i l a b l e em l w ww e l e c t ro p e d i a o rg lead i n g on l i n e F re n c h , d i c t i o n a ry wi t h of e q u i va l e n t e l e c t ro n i c t e rm s in and e l e c t ri c a l a d d i ti o n a l t e rm s c o n ta i n i n g l an guag es Al s o m o re k n o wn as th a n th e 20 000 t e rm s I n t e rn a t i o n a l an d d e fi n i t i o n s E l e c t ro t e c h n i ca l on l i n e C u s to m e r yo u al l by p u b l i ca t i o n s or p u b l i ca t i o n s : Pu bl i sh ed : an d I EC C a ta l o g u e d a te V o c a b u l a ry  of E l e c t ro p e d i a : Th e in to of c o rri g e n d a on -l i n e g i ve s up co n te n t a S e rv i ce to or g i ve C e n t re : us c o n ta c t cs c@ i e c ch Te l : +41 22 91 02 1 F a x: +41 22 91 03 00 yo u r u s: w w w i e c c h /we b s t o re /c u s t s e rv fe e d b a c k on th i s p u b l i c a ti o n or n eed fu rt h e r a s s i s ta n c e , please vi s i t th e C u s to m e r S e rv i c e IEC 60424-5 ® Ed i ti on 2009-02 I N TERN ATI ON AL STAN DARD Ferri te cores – Gu i de on th e l i m i ts of su rface i rreg u l ari ties – Part 5: Plan ar-cores I N TERN ATI ON AL ELECTROTECH N I CAL COM MI SSI ON I CS 0 ® Reg i stered trademark of th e I n tern ati onal El ectrotechn i cal Commi ssi on PRI CE COD E N I SB N 2-831 8-1 032 -6 – – 60424-5 © I EC: 20 09(E ) C O N TE N TS F O RE W O RD S cop e N o rm a ti ve re fe re n ce s L i m i ts o f s u rfa ce i rre g u l a ri ti e s C h i p s a n d g g e d e d g e s C h i p s a n d g g e d e d g e s o n th e m a ti n g s u rfa ce s ( s e e F i g u re s , an d 3) C h i p s a n d g g e d e d g e s o n o th e r s u rfa c e s C cks 3 Fl ash Pul l-out F i g u re – C h i p l o ca ti o n fo r p l a n a r E L - c o re F i g u re – C h i p l o ca ti o n fo r l o w p ro fi l e E - co re F i g u re – C h i p l o ca ti o n fo r l o w p ro fi l e E R- c o re F i g u re – C cks a n d p u l l - o u t l o ca ti o n fo r p l a n a r E L - co re F i g u re – C cks a n d p u l l - o u t l o ca ti o n fo r l o w p ro fi l e E - c o re 1 F i g u re – C cks a n d p u l l - o u t l o ca ti o n fo r l o w p ro fi l e E R- c o re 1 F i g u re – Re fe re n c e d i m e n s i o n s fo r E L - co re 1 F i g u re – Re fe re n c e d i m e n s i o n s fo r E - c o re F i g u re – Re fe re n c e d i m e n s i o n s fo r E R- c o re T a b l e – Al l o wa b l e a re a s o f c h i p s i n m m fo r p l a n a r E L - co re T a b l e – Al l o wa b l e a re a s o f c h i p s i n m m fo r l o w p ro fi l e E - co re T a b l e – Al l o wa b l e a re a s o f c h i p s i n m m fo r l o w p ro fi l e E R- c o re T a b l e – Are a a n d l e n g th re fe re n ce fo r vi s u a l i n s p e c ti o n T a b l e – L i m i ts o f cra cks fo r p l a n a r E L - c o re T a b l e – L i m i ts o f cra cks fo r l o w p ro fi l e E - co re T a b l e – L i m i ts o f cra cks fo r l o w p ro fi l e E R- c o re 60424-5 © I EC: 009(E ) – – I N TE RN ATI O N AL E L E C TRO TE C H N I C AL C O M M I S S I O N F E RRI TE C O RE S – G U I D E O N TH E LI M I TS O F S U RF AC E I RRE G U L ARI TI E S – P a rt : P l a n a r-co re s F O RE W O RD 1) Th e I n t e rn a ti o n a l E l e c t ro t e c h n i c a l C o m m i s s i o n ( I E C ) i s a wo rl d wi d e o rg a n i z a t i o n fo r s t a n d a rd i z a t i o n c o m p ri s i n g al l n ati o n al e l e c t ro t e c h n i c a l com m i ttee s (I EC N a ti o n al C o m m i t te e s ) Th e obj ect of th e I EC is to p ro m o te i n t e rn a t i o n a l c o - o p e t i o n o n a l l q u e s ti o n s c o n c e rn i n g s t a n d a rd i za t i o n i n th e e l e c tri c a l a n d e l e c t ro n i c fi e l d s T o th i s en d an d Te c h n i c a l in a d d i ti o n Re p o rts , to oth e r a cti vi ti e s , P u b l i cl y Ava i l a b l e IEC pu bl i sh es S p e c i fi c a t i o n s I n t e rn a ti o n a l (P AS ) an d S t a n d a rd s , G u i d es Te c h n i c a l ( h e re a fte r S p e c i fi c a t i o n s , re fe rre d to as “I E C P u b l i c a t i o n ( s ) “ ) Th e i r p re p a t i o n i s e n t ru s t e d to te c h n i c a l c o m m i tt e e s ; a n y I E C N a ti o n a l C o m m i tt e e i n t e re s te d in th e s u b j e ct deal t wi t h m ay p a rti c i p a te in th i s p re p a t o ry wo rk I n te rn a t i o n a l , g o ve rn m e n t a l and non- g o v e rn m e n t a l o rg a n i z a t i o n s l i a i s i n g wi t h t h e I E C a l s o p a rt i c i p a t e i n th i s p re p a ti o n I E C c o l l a b o t e s c l o s e l y wi th th e I n te rn a t i o n a l O rg a n i z a t i o n fo r S ta n d a rd i z a t i o n (I S O) in a c c o rd a n c e wi t h d i ti on s d e te rm i n e d by a g re e m e n t b e t we e n t h e t wo o rg a n i za ti o n s 2) Th e fo rm a l d e c i s i o n s o r a g re e m e n ts o f I E C o n t e c h n i c a l m a t te rs e xp re s s , a s n e a rl y a s p o s s i b l e , a n i n t e rn a ti o n a l s e n s u s of opi n i on on th e re l e v a n t s u b j e cts s i n ce e a ch te c h n i c a l c o m m i tt e e h as re p re s e n ta t i o n fro m al l i n te re s t e d I E C N a t i o n a l C o m m i tt e e s 3) I E C P u b l i c a ti o n s h a ve th e fo rm o f re c o m m e n d a t i o n s fo r i n t e rn a t i o n a l u s e a n d a re a c c e p t e d by I E C N ati o n a l C o m m i tt e e s i n th a t s e n s e W h i l e a l l re a s o n a b l e e ffo rt s a re m a d e t o e n s u re th a t th e t e c h n i c a l c o n t e n t o f I E C P u bl i cati o n s is a c c u te , IEC ca n n ot be held re s p o n s i b l e fo r th e wa y in wh i c h th e y a re used or fo r any m i s i n te rp re t a t i o n b y a n y e n d u s e r 4) In o rd e r t o p ro m o t e tra n s p a re n t l y to i n t e rn a t i o n a l th e m a xi m u m u n i fo rm i ty, e xt e n t I EC possi bl e N ati o n al in th e i r C o m m i tt e e s n a ti o n a l an d u n d e rt a k e re g i o n a l to appl y I EC p u b l i ca ti o n s P u b l i c a ti o n s An y d i v e rg e n c e b e t we e n a n y I E C P u b l i c a t i o n a n d th e c o rre s p o n d i n g n a t i o n a l o r re g i o n a l p u b l i c a ti o n s h a l l b e c l e a rl y i n d i c a te d i n th e l a tte r 5) IEC p ro vi d e s no m a rki n g p ro c e d u re to i n d i ca te i ts a p p ro v a l an d can n ot be re n d e re d re s p o n s i b l e fo r any e q u i p m e n t d e c l a re d t o b e i n c o n fo rm i t y wi t h a n I E C P u b l i c a ti o n 6) Al l u s e rs s h o u l d e n s u re t h a t th e y h a v e t h e l a t e s t e d i ti o n o f t h i s p u b l i c a ti o n 7) N o l i a b i l i t y s h a l l a tt a c h t o I E C o r i t s d i re c to rs , e m p l o ye e s , s e rva n t s o r a g e n ts i n c l u d i n g i n d i vi d u a l e xp e rts a n d m e m b e rs o f i t s t e c h n i c a l c o m m i t t e e s a n d I E C N a t i o n a l C o m m i tt e e s fo r a n y p e rs o n a l i n j u ry, p ro p e rt y d a m a g e o r oth e r d am a g e e xp e n s e s of an y a ri s i n g out n a tu re wh a ts o e v e r, wh e th e r d i re c t of p u b l i cati on , u se th e o f, or o r i n d i re c t, re l i a n c e u pon, o r fo r c o s t s th i s I EC (i n cl u d i n g P u bl i cati o n or l eg al fe e s ) and an y oth e r IEC P u bl i cati o n s 8) At t e n ti o n i s d wn t o t h e N o rm a t i ve re fe re n c e s c i t e d i n t h i s p u b l i c a ti o n U s e o f t h e re fe re n c e d p u b l i c a ti o n s i s i n d i s p e n s a b l e fo r t h e c o rre c t a p p l i c a ti o n o f t h i s p u b l i c a t i o n 9) Att e n ti o n i s d wn t o t h e p o s s i b i l i t y t h a t s o m e o f th e e l e m e n t s o f th i s I E C P u b l i c a t i o n m a y b e th e s u b j e c t o f p a te n t ri g h ts I E C s h a l l n o t b e h e l d re s p o n s i b l e fo r i d e n t i fyi n g a n y o r a l l s u c h p a t e n t ri g h ts I n te rn a ti o n a l S ta n d a rd I EC 60424-5 h as been p re p a re d by I EC te ch n i ca l co m m i tte e 51 : M a g n e ti c c o m p o n e n ts a n d fe rri te m a te ri a l s T h e te x t o f th i s s ta n d a rd i s b a s e d o n th e fo l l o wi n g d o c u m e n ts : FDI S Re p o rt o n v o t i n g /9 /F D I S /9 /RV D F u l l i n fo rm a ti o n o n th e vo ti n g fo r th e a p p ro va l o f th i s s ta n d a rd c a n b e fo u n d i n th e re p o rt o n vo ti n g i n d i c a te d i n th e a b o ve ta b l e T h i s p u b l i c a ti o n h a s b e e n d fte d i n a cc o rd a n c e wi th th e I S O /I E C D i re cti ve s , P a rt A l i s t o f a l l p a rts o f th e I E C 4 s e ri e s , u n d e r th e g e n e l ti tl e limits of surface irregularities , c a n b e fo u n d o n th e I E C we b s i te Ferrite cores – Guide on the – – 60424-5 © I EC: 20 09(E ) T h e co m m i tte e h a s d e c i d e d th a t th e co n te n ts o f th i s p u b l i c a ti o n wi l l re m a i n u n c h a n g e d u n ti l th e m a i n te n a n c e re s u l t d a te i n d i ca te d o n th e I E C we b s i te u n d e r " h ttp : //we b s to re i e c c h " i n th e d a ta re l a te d to th e s p e ci fi c p u b l i c a ti o n At th i s d a te , th e p u b l i ca ti o n wi l l b e • re co n fi rm e d , • wi th d wn , • re p l a ce d b y a re vi s e d e d i ti o n , o r • am en d ed A b i l i n g u a l ve rs i o n o f th i s p u b l i c a ti o n m a y b e i s s u e d a t a l a te r d a te 60424-5 © I EC: 009(E ) – – F E RRI TE C O RE S – G U I D E O N TH E LI M I TS O F S U RF AC E I RRE G U L ARI TI E S – P a rt : P l a n a r-co re s S co p e T h i s p a rt o f I E C 4 g i v e s g u i d a n ce o n a l l o wa b l e l i m i ts o f s u rfa c e i rre g u l a ri ti e s a p p l i c a b l e to p l a n a r- c o re s i n a cc o rd a n c e wi th th e re l e va n t g e n e ri c s p e c i fi c a ti o n d e fi n e d i n I E C 4 - T h e re l a ti o n s b e twe e n th e m a i n d i m e n s i o n s o f p l a n a r E - , E R- a n d E L - c o re s d i ffe r fro m th o s e o f s ta n d a rd c o re s F o r e xa m p l e , th e wi d th o f p l a n a r c o re s i s l a rg e r wh i l e th e to ta l h e i g h t i s m u ch s m a l l e r Al s o th e th i ckn e s s o f th e legs is in m ost cas es sm al l er th a n co m p a re d to s ta n d a rd co re s T h e re fo re th e c o n ce p t o f fi x e d re fe re n ce d i m e n s i o n s to d e te rm i n e th e l e n g th o f cra ck l i m i ts yi e l d cra c k l e n g th s wh i ch a re n o t a cc e p ta b l e fo r th i s t yp e o f c o re T h i s p a rt o f I EC 60424 fo l l o ws a n o th e r ce pt wh i c h re l a te s th e cra ck l e n g th to d im ensions of th e s u rfa c e o n wh i c h th e cra ck o ccu rs Al s o th e co n c e p t to d e te rm i n e th e m a xi m u m a re a o f ch i p s b a s e d o n th e to ta l m a ti n g s u rfa c e fa i l s i n th e c a s e o f p l a n a r co re s T h e o u te r l e g s o f p l a n a r c o re s a re m u ch th i n n e r th a n th o s e o f s ta n d a rd m a xi m u m co re s s i ze wh i c h on th e m a ke s o u te r o ve rl a p p i n g leg m a y ri s k an d th e gluing m u ch m o re fu n c ti o n a l i t y o f th e d i ffi c u l t c o re A single s e t ch i p T h e re fo re of th i s s ta n d a rd u s e s a s a re fe re n c e th e m a ti n g s u rfa c e o n wh i c h th e c h i p o ccu rs W i n d i n g s o f p l a n a r c o re s a re o fte n P C B ’ s wh i c h a re g l u e d to th e i n n e r s u rfa ce s o f th e p l a n a r co re F o r th i s re a s o n th e i n n e r s u rfa ce s o f th e p l a n a r c o re s n e e d to h a ve a b e tte r q u a l i t y th a n th e i n n e r s u rfa c e s o f s ta n d a rd co re s T h i s wa s ta ke n i n to a cc o u n t b y re d u ci n g th e m a xi m u m a l l o wa b l e a re a o f p u l l o u ts i n th e i n n e r s u rfa c e s Th i s s ta n d a rd is c o n s i d e re d as a s e c ti o n a l s p e ci fi c a ti o n u s e fu l in th e n e g o ti a ti o n b e twe e n fe rri te c o re m a n u fa ctu re rs a n d u s e rs a b o u t s u rfa c e i rre g u l a ri ti e s N o rm ati ve re fe re n ce s T h e fo l l o wi n g re fe re n c e d d o c u m e n ts a re i n d i s p e n s a b l e fo r th e a p p l i c a ti o n o f th i s d o c u m e n t F o r d a te d re fe re n ce s , o n l y th e e d i ti o n c i te d a p p l i e s F o r u n d a te d re fe re n c e s , th e l a te s t e d i ti o n o f th e re fe re n c e d d o cu m e n t ( i n c l u d i n g a n y a m e n d m e n ts ) a p p l i e s I EC 60424-1 , Ferrite cores – Guide on th e lim its of surfa ce irre gula rities – Part : Ge neral specifica tion I E C - , Ferrite cores – Dimensions – Part 9: Pla na r-cores –6– 60424-5 © IEC:2009(E) Li m i ts o f s u rfa ce i rre g u l a ri ti e s 3 C h i p s a n d g g e d e d g e s C h i p s a n d g g e d e d g e s o n th e m a ti n g s u rfa c e s ( s e e F i g u re s , a n d ) Mating surfaces C1 ′ C1 Ragged edges IEC 360/09 F i g u re – C h i p l o c a ti o n fo r p l a n a r E L -co re Mating surfaces C1 ′ C2 C1 Ragged edges IEC 361/09 F i g u re – C h i p l o c a ti o n fo r l o w p ro fi l e E - co re Mating surfaces C1 ′ C2 Ragged edges C1 Wire slot area IEC 362/09 F i g u re – C h i p l o c a ti o n fo r l o w p ro fi l e E R-c o re Areas of the chips located on the mating surfaces (C1 and C1 ’ irregularities in Figures , and 3) shall not exceed the following limits: – the cumulative area of the chips shall be less than % of the relevant mating surface The mating surface of each outer leg and centre post is considered separately; the allowable areas are rounded to the figures in Table (Area and length reference for visual inspection) and the minimum allowable area is taken as 0,5 mm to be distinguishable to the naked eye; 60424-5 © IEC:2009(E) –7– – the total area of all chips on all mating surfaces shall not exceed the value given for “overall chipping on the mating surface” in Tables , or 3; – the total length of the ragged edges shall be less than 25 % of the perimeter of the relevant mating surface C h i p s a n d g g e d e d g e s o n o th e r s u rfa ce s – the allowable chipping areas are doubled as compared to the limits for the whole mating surfaces (see Table for planar EL-corers, Table for low profile E-cores, Table for low profile ER-cores); – the total length of the ragged edges shall be less than 25 % of the perimeter of the smaller adjoining surface; – chips and ragged edges are not acceptable on the ridge of the clamping recess area; – chips and ragged edges are not acceptable on the inner edges of wire slot area (C2 irregularity in Figures and 3) The core sizes given in Tables , and correspond to the cores defined in IEC 6231 7-9, and area and length reference for visual inspection are given in Table T a b l e – Al l o wa b l e a re a s o f c h i p s i n m m fo r p l a n a r E L -co re C o re s i z e EL 1 × 2,0 EL 1 × 3,0 EL × 2,2 EL × 3,2 EL 5,5 × 2,9 EL 5,5 × 4,4 EL × 3,7 EL × 5,7 EL 20 × 3,8 EL 20 × 5,8 EL 22 × 4,0 EL 22 × 6,0 EL 25 × 4,3 EL 25 × 6,3 C h i p p i n g o n m a ti n g C h i p p i n g o n m a ti n g s u rfa c e o f o n e o u te r s u rfa c e o f c e n t re l eg pos t 0,5 0,5 0,5 0,5 0,5 0,5 ,0 ,0 ,0 ,0 ,5 ,5 ,5 ,5 0,5 0,5 ,0 ,0 ,0 ,0 2,0 2,0 2,0 2,0 2,5 2,5 3,5 3,5 O ve l l c h i p p i n g o n m a ti n g s u rfa c e ,5 ,5 2,0 2,0 2,0 2,0 4,0 4,0 4,0 4,0 5,5 5,5 6,5 6,5 O th e r s u rfa c e s 3,0 3,0 4,0 4,0 4,0 4,0 8,0 8,0 8,0 8,0 1 ,0 1 ,0 3,0 3,0 – – 60424-5 © I EC: 20 09(E ) T a b l e – Al l o wa b l e a re a s o f c h i p s i n m m fo r l o w p ro fi l e E -co re C o re s i z e × 3, × E 18 × × E 22 × × E 32 × × E 38 × × E 43 × × 28 E 58 × 1 × 38 E 64 × × 50 E 02 × × 38 E 14 C h i p p i n g o n m a ti n g C h i p p i n g o n m a ti n g s u rfa c e o f o n e o u te r s u rfa c e o f c e n t re l eg pos t 0, 0, ,5 3, ,0 ,5 3, 7, ,5 3, 6, 2, 2, 5, 0, 20, 3, 8, 5, 30, 4, 9, 8, 36, 6, 2, 24, 49, 0, 20, 40, 80, 2, 20, 45, 90, O ve l l c h i p p i n g o n m a ti n g s u rfa c e O th e r s u rfa c e s T a b l e – Al l o wa b l e a re a s o f c h i p s i n m m fo r l o w p ro fi l e E R-co re C o re s i z e × 2, × ER 1 × 2, × ER × × ER 4, × × ER × × ER 20 × × ER 23 × 3, × ER 23 × × ER 25 × × ER 30 × × 20 ER 32 × × 21 ER 32 × × 25 ER 35 × × 26 ER 40 × × 28 ER 9, C h i p p i n g o n m a ti n g C h i p p i n g o n m a ti n g s u rfa c e o f o n e o u te r s u rfa c e o f c e n t re l eg pos t 0, 0, ,5 3, 0, 0, ,5 3, 0, ,0 2, 4, 0, ,0 2, 4, 0, ,0 2, 4, ,5 2, 5, 0, ,0 2, 4, 8, ,0 2, 4, 8, ,5 3, 6, 2, 2, 4, 9, 8, 2, 4, 8, 6, 2, 5, 0, 20, 3, 7, 4, 28, 4, 7, 5, 30, O ve l l c h i p p i n g o n m a ti n g s u rfa c e O th e r s u rfa c e s 60424-5 © I EC: 009(E ) – – Tabl e – Area an d l en g th referen ce for vi su al i n spection Surface 0, m m , mm A B C D E Surface 2,5 mm 2, m m 2, m m 3, m m 4, m m 7,5 mm 5, m m 6, m m 8, m m 9, m m E 2 2 2 25 , m m 2 2 35 , m m 2 40 , m m 7, m m D 30 , m m 4, m m C 20 , m m 3, m m B 5, mm , mm A 2 45 , m m 2 50 , m m 0,0 mm 2 Eche ll e mm mm mm :1 mm 7, m m mm mm IEC 674/99 – 10 – 60424-5 © IEC:2009(E) C cks Different cracks are shown in Figures 4, and In principle three different types of cracks can be distinguished a) Cracks which are parallel to the magnetic flux path (S1 , S2, S5, S5’, S5’’) These cracks are magnetically not critical The maximum length of a single crack is 33 % (1 /3) of the dimension of the relevant surface which is parallel to the crack In the case of multiple cracks the maximum cumulative length doubles b) Cracks which are perpendicular to the magnetic flux path (S3, S3’, S3’’, S4, S4’) These cracks are magnetically critical They may reduce the relative cross section of the magnetic flux or add an additional air gap into the magnetic circuit The maximum total length of cracks is 20 % (1 /5) of the dimension of the relevant surface which is parallel to the crack c) Cracks which go from one edge to another edge (S6) These cracks may cause chipping during the operation in the circuit The loose particles may cause malfunctions in the circuit Therefore this type of crack is not acceptable in any case The limits for cracks are given in Tables 5, and 3 Flash There shall be no flash extending from the core into the wire slot P u l l -o u t The pull-outs are applicable only for the inner surface where the PCB is seated (as shown in Figures 4, and 6) For planar EL-cores, low profile E-cores and low profile ER-cores, the cumulative area of pullouts of the core shall be less than 20 % of the total respective surface area S5 S2 S3 S6 S1 S3″ S4 S5′ S4′ S5″ Pull-out F i g u re – C c ks a n d p u l l -o u t l o ca ti o n fo r p l a n a r E L -co re IEC 363/09 60424-5 © I EC: 009(E ) – 11 – S1 S3 S5 S2 S3 ″ ″ S5 S3 S6 S4 S4 ′ S5 ′ Pu l l -ou t ′ IEC 364/09 F i g u re – C c ks a n d p u l l -o u t l o ca ti o n fo r l o w p ro fi l e E -co re S1 S3 S3 ″ S5 ″ S2 S5 Pu l l -ou t S5 S6 ′ S4 ′ S4 IEC F i g u re – C c ks a n d p u l l -o u t l o ca ti o n fo r l o w p ro fi l e E R-co re B1 R1 C F1 R1 R R1 pl aces A F2 E D F2 = IEC 366/09 F i g u re – Re fe re n c e d i m e n s i o n s fo r E L -co re 365/09 – 12 – 60424-5 © IEC:2009(E) T a b l e – L i m i t s o f cra c ks fo r p l a n a r E L -co re L i m i ts fo r s i n g l e c c k L i m i ts fo r m u l ti p l e c c ks 33 % (1 /3) of reference dim 33 % (1 /3) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 33 % (1 /3) of reference dim 33 % (1 /3) of reference dim 33 % (1 /3) of reference dim No cracks allowed F1 ( A - E)/ F2 F1 C –D B1 – D B1 B1 A A Multiple edges 66 % (2/3) of reference dim 66 % (2/3) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 66 % (2/3) of reference dim 66 % (2/3) of reference dim 66 % (2/3) of reference dim B1 C D E S1 S2 S3 S3’ S3’’ S4 S4’ S5 S5’ S5” S6 See Figure See Figure Re fe re n c e d i m e n s i o n F A T yp e IEC 367/09 F i g u re – Re fe re n c e d i m e n s i o n s fo r E -c o re 60424-5 © IEC:2009(E) – 13 – T a b l e – L i m i ts o f cra c ks fo r l o w p ro fi l e E -co re L i m i ts fo r s i n g l e c c k L i m i ts fo r m u l ti p l e c cks 33 % (1 /3) of reference dim 33 % (1 /3) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 33 % (1 /3) of reference dim 33 % (1 /3) of reference dim 33 % (1 /3) of reference dim No cracks allowed F ( A - E)/2 C F C –D B1 – D B1 B1 A A Multiple edges 66 % (2/3) of reference dim 66 % (2/3) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 66 % (2/3) of reference dim 66 % (2/3) of reference dim 66 % (2/3) of reference dim B1 C E D G S1 S2 S3 S3’ S3’’ S4 S4’ S5 S5’ S5” S6 See Figure See Figure Re fe re n c e d i m e n s i o n F A T yp e IEC 368/09 F i g u re – Re fe re n c e d i m e n s i o n s fo r E R-co re – 14 – 60424-5 © IEC:2009(E) T a b l e – L i m i ts o f cra c ks fo r l o w p ro fi l e E R-c o re T yp e S1 S2 S3 S3’’ S4 S4’ S5 S5’ S5” S6 See Figure See Figure Re fe re n c e d i m e n s i o n F ( A - G)/ F C –D B1 – D B1 B1 A A Multiple edges L i m i ts fo r s i n g l e c c k 33 % (1 /3) of reference dim 33 % (1 /3) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 33 % (1 /3) of reference dim 33 % (1 /3) of reference dim 33 % (1 /3) of reference dim No cracks allowed _ L i m i ts fo r m u l ti p l e c c ks 66 % (2/3) of reference dim 66 % (2/3) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 20 % (1 /5) of reference dim 66 % (2/3) of reference dim 66 % (2/3) of reference dim 66 % (2/3) of reference dim INTERNATIONAL ELECTROTECHNICAL COMMISSION 3, rue de Varembé PO Box 31 CH-1 21 Geneva 20 Switzerland Tel: + 41 22 91 02 1 Fax: + 41 22 91 03 00 info@iec.ch www.iec.ch