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ASTM A 1036 Document Information:
Title
Standard Guide for Measuring Power Frequency Magnetic Properties of Flat-Rolled Electrical Steels Using Small Single Sheet Testers
ASTM International
Publication Date:
May 1, 2004
Scope:
This guide covers procedures for interpreting the specific core loss
and peak permeability
determined using small single-sheet test systems. It is limited to
single-sheet test systems that
require a test specimen or coupon be cut from the material being
tested and are designed such that
the entire width of that test specimen is magnetized during testing.
This guide is primarily intended for measurements of the magnetic
properties of flat-rolled
electrical steels at frequencies of 50 Hz or 60 Hz under sinusoidal
flux conditions.
This guide includes procedures to provide correlation with the 25-cm
Epstein test method (Test
Method A 343/A 343M).
The range of magnetic flux densities is governed by the properties of
the test specimens and the
instruments and test power source. Nonoriented electrical steels may
be tested at magnetic flux
densities up to about 16-kG [1.6T] for core loss. The maximum magnetic
field strength for peak
permeability testing is limited by the current carrying capacity of
the magnetizing winding and the
test power source. Single sheet testers are typically capable of
testing at magnetic field
strengths up to 50 Oe [4000 A/m] or more.
Within this guide, a small single sheet tester (small SST) is defined
as a magnetic tester designed
to test flat, rectangular sheet-type specimens. Typical specimens for
these testers are square (or
nearly so). The design of the small SST test fixture may be small
enough to accommodate specimens
about 5 by 5 cm or may be large enough to accommodate specimens about
36 by 36 cm. Specimens for a
particular SST must be appropriate for the particular test fixture.
This guide covers two alternative test methods: Method 1 and Method 2.
Method 1 is an extension of Method 1 of Test Method A 804/A 804M,
which describes a test fixture
having two windings that encircle the test specimen and two
low-reluctance, low-core loss
ferromagnetic yokes that serve as flux return paths. The dimensions of
the test fixture for Method
1 are not fixed but rather may be designed and built for any nominal
specimen dimension within the
limits given in 1.5. The power loss in this case is determined by
measuring the average value of
the product of primary current and induced secondary voltage.
Method 2 covers the use of a small single sheet tester, which employs
a magnetizing winding, a
magnetic flux sensing winding, and a magnetic field strength detector.
The power loss in this case
is determined by measuring the average value of the product of induced
secondary voltage and
magnetic field strength.
The calibration method described in the Annex of this guide applies to
both test methods.
The values and equations stated in customary (cgs-emu and inch-pound)
or SI units are to be
regarded separately as standard. Within this standard, SI units are
shown in brackets. The values
stated in each system may not be exact equivalents; therefore, each
system shall be used
independently of the other. Combining values from the two systems may
result in nonconformance with
this standard.
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
requirements prior to use.
Keywords:
- alternating current
- core loss
- electrical steel
- flux density
- magnetic
- magnetic material
- magnetic test
- permeability
- power frequency
- sheet
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