ASTM A1009-05
(Specification)Standard Specification for Soft Magnetic MnZn Ferrite Core Materials for High Frequency (10 kHz-1 MHz) Power Transformer and Filter Inductor Applications
Standard Specification for Soft Magnetic MnZn Ferrite Core Materials for High Frequency (10 kHz-1 MHz) Power Transformer and Filter Inductor Applications
ABSTRACT
This specification deals with soft magnetic manganese zinc ferrite core materials for high frequency power transformer and filter inductor applications. Standard types of both power transformer and filter inductor material are defined. For power transformer use, there are five types defined by their maximum core loss density and minimum saturation flux density. For filter inductor materials, three types are defined based on their inductance permeability. Apart from magnetic property requirements, dimensional tolerances and workmanship requirements are defined in this specification.
SCOPE
1.1 This specification covers the requirements to which the specified grades of soft magnetic MnZn ferrite materials shall conform. Cores made from these materials are used primarily in power transformers and filter inductors.
1.2 The values stated in customary (cgs-emu and inch-pounds) units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units, which are provided for information only and are not considered standard.
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Designation: A1009 – 05
Standard Specification for
Soft Magnetic MnZn Ferrite Core Materials for High
Frequency (10 kHz-1 MHz) Power Transformer and Filter
1
Inductor Applications
This standard is issued under the fixed designation A1009; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
where:
–9
n = nano = 10 ,
1.1 This specification covers the requirements to which the
nH = inductance in nanohenries, and
specified grades of soft magnetic manganese zinc (MnZn)
N = number of turns on winding (example: 0.005 H with
ferrite materials shall conform. Cores made from these mate-
2 2 2
a 100 turn coil = 0.005/(100) H/N = 500 nH/N ).
rials are used primarily in power transformers and filter
3.2.2 Mated Core Set—Two or more core segments as-
inductors.
sembled with the magnetic flux path perpendicular to the
1.2 The values stated in customary (cgs-emu and inch-
mating surface.
pounds) units are to be regarded as standard. The values given
3.2.3 Air core inductance, L , is the inductance of a core
air
in parentheses are mathematical conversions to SI units, which
with the same magnetic path length and cross-sectional core
are provided for information only and are not considered
area but with the relative permeability of air.
standard.
3.2.3.1 Customary Units
2. Referenced Documents
2 –9
L 5 4PAN 10 /l,H
air 1
2
2.1 ASTM Standards:
where:
A340 Terminology of Symbols and Definitions Relating to
N = number of turns on winding;
Magnetic Testing
2
A = cross-sectional area of core specimen, cm ; and
A1013 Test Method for High-Frequency (10 kHz-1 MHz)
l = effective magnetic path length, cm.
1
Core Loss of Soft Magnetic Core Components at Con-
3.2.3.2 SI Units
trolled Temperatures Using the Voltmeter-Ammeter-
2 –7
Wattmeter Method
L 5 4PAN 10 /l,H
air 1
3. Terminology
where:
N = number of turns on winding;
3.1 The terms and symbols used in this specification are
2
A = cross-sectional area of core specimen, m ; and
defined in Terminology A340.
l = effective magnetic path length, m.
1
3.2 Definitions of Terms Specific to This Standard:
3.2.1 Inductance Index (AL value)—the self inductance per
4. Classification
2
winding turn squared (L/N ) expressed in units of nanohenries
4.1 The soft magnetic MnZn ferrite material-type designa-
2
per turns squared (nH/N ).
tions for power transformer and filter inductor materials
covered by this specification are listed in Table 1, Table 2, and
Table X1.1. The prefix of the type designations identifies each
1
This specification is under the jurisdiction of ASTM Committee A06 on material’s intended use. Power transformer materials are de-
Magnetic Properties and is the direct responsibility of Subcommittee A06.02 on
noted with the prefix Pand filter materials are denoted with the
Material Specifications.
prefix F.
Current edition approved Nov. 1, 2005. Published December 2005. Originally
4.2 The first and second digits of the type designations for a
approved in 2000. Last previous edition approved in 2000 as A1009 – 00. DOI:
10.1520/A1009-05.
power transformer material identify the typical core loss
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 3
density of the material in mW/cm , and the remainder of the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
type designation identifies the temperatures in °C in which the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. core material must not exceed the maximum core loss density.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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A1009 – 05
TABLE 1 Power Transformer Material Type Designations and
6. Magnetic Properties
Magnetic Requirements
6.1 The size of a soft magnetic MnZn ferrite power trans-
Specified
former core for relatively high frequencies (>50 kHz) is often
Temperatures
That Core
constrained by the core loss at the operating temperature. Each
Maximum Core Loss Minimum Saturation Flux
Loss Density
A B
Density Density power material type is identified by a maximum core loss
ASTM Power
Must Not
Material density limit at the temperatures where the core loss density is
Exceed
Type
Maximum
intended to be below this maximum limit as shown in Table 1.
Customary
6.2 The size of a soft magnetic MnZn ferrite power trans-
SI Units, SI Units, Customary
Units, mW/ SI Units, T
3
W/m °C Units, G former core for relatively low frequencies (<50 kHz) is often
3
cm
constrained by the saturation flux density. The minimum
P5025-100 65 65 000
...
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