ASTM A1009-05(2010)

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 manganese zinc (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.

General Information

• Status: Historical
• Publication Date: 31-Oct-2010
• ICS: 29.100.10 - Magnetic components
• Technical Committee: A06 - Magnetic Properties
• Drafting Committee: A06.02 - Material Specifications

Relations

• Replaces: ASTM A1009-05 - Standard Specification for Soft Magnetic MnZn Ferrite Core Materials for High Frequency (10 kHz-1 MHz) Power Transformer and Filter Inductor Applications
• Effective Date: 01-Nov-2010

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:A1009 −05 (Reapproved 2010)
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
nH = inductance in nanohenries, and
N = number of turns on winding (example: 0.005 H with a
1.1 This specification covers the requirements to which the
2 2 2
100 turn coil = 0.005/(100) H/N = 500 nH/N ).
specified grades of soft magnetic manganese zinc (MnZn)
ferrite materials shall conform. Cores made from these mate-
3.2.2 Mated Core Set—Two or more core segments as-
rials are used primarily in power transformers and filter
sembled with the magnetic flux path perpendicular to the
inductors.
mating surface.
1.2 The values stated in customary (cgs-emu and inch- 3.2.3 Air core inductance, L , is the inductance of a core
air
pounds) units are to be regarded as standard. The values given
with the same magnetic path length and cross-sectional core
in parentheses are mathematical conversions to SI units, which area but with the relative permeability of air.
are provided for information only and are not considered
3.2.3.1 Customary Units
standard.
2 29
L 5 4ΠAN 10 /l ,H
air 1
2. Referenced Documents
where:
2
2.1 ASTM Standards:
N = number of turns on winding;
2
A340 Terminology of Symbols and Definitions Relating to A = cross-sectional area of core specimen, cm ; and
Magnetic Testing l = effective magnetic path length, cm.
1
A1013 Test Method for High-Frequency (10 kHz-1 MHz)
3.2.3.2 SI Units
Core Loss of Soft Magnetic Core Components at Con-
2 27
L 5 4ΠAN 10 /l ,H
trolled Temperatures Using the Voltmeter-Ammeter- air 1
Wattmeter Method
where:
N = number of turns on winding;
3. Terminology
2
A = cross-sectional area of core specimen, m ; and
3.1 The terms and symbols used in this specification are
l = effective magnetic path length, m.
1
defined in Terminology A340.
3.2 Definitions of Terms Specific to This Standard: 4. Classification
3.2.1 Inductance Index (AL value)—the self inductance per
4.1 The soft magnetic MnZn ferrite material-type designa-
2
winding turn squared (L/N ) expressed in units of nanohenries
tions for power transformer and filter inductor materials
2
per turns squared (nH/N ).
covered by this specification are listed in Table 1, Table 2, and
Table X1.1. The prefix of the type designations identifies each
where:
–9
material’s intended use. Power transformer materials are de-
n = nano = 10 ,
noted with the prefix Pand filter materials are denoted with the
prefix F.
1
This specification is under the jurisdiction of ASTM Committee A06 on
4.2 The first and second digits of the type designations for a
Magnetic Propertiesand is the direct responsibility of Subcommittee A06.02 on
Material Specifications. power transformer material identify the typical core loss
3
Current edition approved Nov. 1, 2010. Published December 2010. Originally
density of the material in mW/cm , and the remainder of the
approved in 2000. Last previous edition approved in 2005 as A1009 – 05. DOI:
type designation identifies the temperatures in °C in which the
10.1520/A1009-05R10.
2
core material must not exceed the maximum core loss density.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
4.3 The last four digits of the type designations for filter
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. materials identify the typical relative inductance permeability.
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A1009−05 (2010)
TABLE 1 Power Transformer Material Type Designations and
5.1.6 Exceptions to the specification or special require-
Magnetic Requirements
ments.
Specified
Temperatures
6. Magnetic Properties
That
Core
6.1 The size of a soft magnetic MnZn ferrite power trans-
Loss Minimum Saturation
A
Maximum Core Loss Density
former core for relatively high frequencies (>50 kHz) is often
ASTM B
Density Flux Density
Power
constrained by the core loss at the operating temperature. Each
Must
Material
Not
power material type is identified by a maximum core loss
Type
Exceed
density limit at the temperatures where the core loss density is
Maximum
intended to be below this maximum limit as shown in Table 1.
Customary SI SI
Customary
3
Units, SI Units, W/m Units, Units,
6.2
...