EN 61247:1997
(Main)PM-cores made of magnetic oxides and associated parts - Dimensions
PM-cores made of magnetic oxides and associated parts - Dimensions
Specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of PM-cores made of magnetic oxides and the main dimensions for associated coil formers.
PM-Kerne aus magnetischen Oxiden und Zubehörteile - Maße
Noyaux PM en oxydes magnétiques et pièces associées - Dimensions
Spécifie les dimensions qui sont importantes pour l'interchangeabilité mécanique d'une gamme préférentielle de noyaux PM en oxydes magnétiques et les principales dimensions des carcasses associées.
PM-cores made of magnetic oxides and associated parts - Dimensions (IEC 61247:1995)
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SLOVENSKI STANDARD
01-september-2002
PM-cores made of magnetic oxides and associated parts - Dimensions (IEC
61247:1995)
PM-cores made of magnetic oxides and associated parts - Dimensions
PM-Kerne aus magnetischen Oxiden und Zubehörteile - Maße
Noyaux PM en oxydes magnétiques et pièces associées - Dimensions
Ta slovenski standard je istoveten z: EN 61247:1997
ICS:
29.100.10 Magnetne komponente Magnetic components
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
NORME CE1
INTERNATIONALE IEC
INTERNATIONAL
Première édition
STANDARD
First edition
1995-05
Noyaux PM en oxydes magnétiques et
pièces associées - Dimensions
PM-cores made of magnetic oxides and
associated parts - Dimensions
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1247 ©IEC:1995 – 3 –
CONTENTS
Page
FOREWORD 5
Clause
1 Scope and object 7
2 Normative references 9
3 Conversion system 9
4 Primary standards 9
4.1 Dimensions of PM-cores 9
4.2 Dimensions of coil formers
4.3 Pin locations and base outlines
4.4 Pin diameter
5 Mounting hardware
Annexes
A Derived standards
B Example of a gauge to check the coil former space dimensions of PM-cores
meeting the IEC primary standard
25 C Recommended main dimensions for mounting hardware
1247 ©IEC:1995 - 5 -
INTERNATIONAL ELECTROTECHNICAL COMMISSION
PM-CORES MADE OF MAGNETIC OXIDES AND
ASSOCIATED PARTS - DIMENSIONS
FOREWORD
The IEC (International Electrotechnical Commission) is a worldwide organization for standardization
1)
comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to
promote international cooperation on all questions concerning standardization in the electrical and
electronic fields. To this end and in addition to other activities, the IEC publishes International Standards.
Their preparation is entrusted to technical committees; any IEC National Committee interested in
the subject dealt with may participate in this preparatory work. International, governmental and
non-governmental organizations liaising with the IEC also participate in this preparation. The IEC
collaborates closely with the International Organization for Standardization (ISO) in accordance with
conditions determined by agreement between the two organizations.
The formal decisions or agreements of the IEC on technical matters, prepared by technical committees on
2)
which all the National Committees having a special interest therein are represented, express, as nearly as
possible, an international consensus of opinion on the subjects dealt with.
They have the form of recommendations for international use published in the form of standards, technical
3)
reports or guides and they are accepted by the National Committees in that sense.
In order to promote international unification, IEC National Committees undertake to apply IEC International
4)
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
International Standard IEC 1247 has been prepared by IEC technical committee 51:
Magnetic components and ferrite materials.
The text of this standard is based on the following documents:
Report on voting
DIS
51/389/RVD
51/355/D IS
Full information on the voting for the approval of this standard can be found in the report
on voting indicated in the above table.
rt of this standard.
Annexes A and B form an integral pa
Annex C is for information only.
1247 ©IEC:1995 - 7 -
PM-CORES MADE OF MAGNETIC OXIDES AND
ASSOCIATED PARTS - DIMENSIONS
1 Scope and object
rtance for mechanical
This International Standard specifies the dimensions that are of impo
interchangeability for a preferred range of PM-cores made of magnetic oxides, the main
dimensions for coil formers to be used with these cores and the locations of their pins on a
modular printed wiring grid in relation to the base outlines of cores. It also specifies the
effective parameter values to be used in calculations involving these cores.
rts
The use of derived standards which give a more detailed specification of component pa
whilst still permitting compliance with this standard is discussed in annex A.
PM-cores are so called because they are derived from pot-cores and have cut outs
permitting the use of coil formers containing terminal pins for mounting on a modular
printed wiring board.
They are mainly intended for use in power applications such as switched mode power
supplies (SMPS), pulse power transformers and broadband transformers.
For these applications the pot-core shape gives the advantage, compared with other
shapes, of a relatively large cross-section with correspondingly high magnetic flux, which
in turn permits windings of fewer turns for a given power, with the associated benefits of
low leakage inductance and self-capacitance. These cores also provide good shielding,
easy mounting and enable precise air-gaps to be ground.
PM-cores are also of interest for new SMPS techniques involving higher powers at
frequencies greater than 50 kHz, since, because they possess relatively small openings,
the stray field losses which increase with frequency are much smaller than with any E-core
type.
The present range of PM-cores contains five sizes, four of which are suitable for mounting
directly on a printed wiring board with a simple U-bolt mounting. The locations of the
mounting pins for these cores and their numbering are specified: they are at spacings of
two modules and their possible number varies from 14 to 20.
The largest core is too heavy for mounting on a printed wiring board, and neither the
number or location of its terminal pins, which are usually located within the cut-out of the
core, are specified.
1247 ©IEC:1995 - 9 -
2 Normative references
The following normative documents contain provisions which, through reference in
this text, constitute provisions of this International Standard. At the time of publication, the
rties
editions indicated were valid. All normative documents are subject to revision, and pa
to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated
below. Members of IEC and ISO maintain registers of currently valid International
Standards.
Calculation of the effective parameters of magnetic piece parts
IEC 205: 1966,
Amendment No. 1 (1976)
Amendment No. 2 (1981)
rt 1:
Cores for inductors and transformers for telecommunications - Pa
IEC 367-1: 1982,
Measuring methods
Amendment No. 1 (1984)
Amendment No. 2 (1992)
Toleranced dimensions - Conversion from inches into millimetres and vice
ISO 370: 1975,
versa
3 Conversion system
3.1 The original system is the metric system.
3.2 Toleranced dimensions have been converted by applying the rules of method A
of ISO 370*.
No rule is laid down for the conversion of the nominal value, but in cases where the converted
dimensions are given as a nominal dimension with symmetrical tolerance, it is normal
practice to state that nominal value with the same number of decimal places as the limits.
3.3 Single-limit millimetre dimensions (maximum or minimum) have been converted by
applying the appropriate conversion table of ISO 370, and rounding to two more decimal
places than the original value in a given column relating to a particular dimension.
4 Primary standards
Compliance with the following requirements ensures mechanical interchangeability of the
complete assemblies and coil formers.
4.1 Dimensions of PM-cores
Main dimensions
4.1.1
The main dimensions of PM-cores shall be as given in table 1.
In practice, the converted dimensions will normally be given with not more than three decimal places. The
conversion rules may, however, result in more than three decimal places in order to keep the tolerance loss
at a minimum. In general, it is left to the users of this standard to apply further rounding, but such further
rounding has been introduced where it would not cause the two original millimetre limits to be exceeded by
more than 2,5 % of the tolerance (i.e. the difference between the two limits).
1247 ©IEC:1995 - 11 -
Table 1 - Main dimensions of PM-cores
A-A
h^
•
WC 32055
Size PM 50/39 PM 62/49 PM 74/59 PM 87/70 PM 114/93 Units
max. 50,0 62,0 74,0 87,0 114 mm
2,913 3,425 4,488 in
d1 1,969 2,441
min. 48,3 60,0 71,5 84,0 109,5 mm
1,902 2,362 2,815 3,307 4,311 in
max. 40,3 50,3 59,3 69,2 91,7 mm
2,724 3,610 in
d2 1,587 1,980 2,334
min. 39,0 48,8 57,5 67,1 88,0 mm
2,642 3,465 in
1,535 1,921 2,264
max. 20,0 25,5 29,5 31,7 43,0 mm
1,248 1,693 in
d3 0,787 1,004 1,161
min. 19,4 24,7 28,5 30,7 41,6 mm
1,638
0,764 0,972 1,122 1,209 in
5,7 5,7 8,8 5,8 mm
max. 5,7
d4 0,2244 0,2244 0,2244 0,3465 0,2284 in
8,5 5,4 mm
min. 5,4 5,4 5,4
0,2126 0,2126 0,2126 0,3346 0,2126 in
49,0 59,0 70,0 93,0 mm
max. 39,0
3,661
h 1 1,535 1,929 2,322 2,756 in
92,0 m m
min. 38,6 48,6 58,4 69,2
1,512 1,913 2,299 2,724 3,622 in
64,6 mm
max. 27,2 34,2 41,5 48,8
h2 1,071 1,346 1,634 1,921 2,543 in
63,0 mm
min. 26,4 33,4 40,7 48,0
1,039 1,315 1,602 1,890 2,480 in
(Continued on page 13)
1247 © IEC:1995 - 13 -
Table 1 - Main dimensions of PM-cores (concluded)
Units
Size PM 50/39 PM 62/49 PM 74/59 PM 87/70 PM 114/93
36,0 45,0 mm
c max. 23,0 28,5 33,0
1,772 in
0,9055 1,1
...
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