Amendment 1 - Magnetic materials - Part 15: Methods for the determination of the relative magnetic permeability of feebly magnetic materials

Amendement 1 - Matériaux magnétiques - Partie 15: Méthodes de détermination de la perméabilité magnétique relative des matériaux faiblement magnétiques

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Status
Published
Publication Date
04-Dec-2016
Current Stage
PPUB - Publication issued
Completion Date
05-Dec-2016
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IEC 60404-15:2012/AMD1:2016 - Amendment 1 - Magnetic materials - Part 15: Methods for the determination of the relative magnetic permeability of feebly magnetic materials
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IEC 60404-15
Edition 1.0 2016-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Magnetic materials –
Part 15: Methods for the determination of the relative magnetic permeability of
feebly magnetic materials
Matériaux magnétiques –
Partie 15: Méthodes de détermination de la perméabilité magnétique relative des
matériaux faiblement magnétiques
IEC 60404-15:2012-09/AMD1:2016-12(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60404-15
Edition 1.0 2016-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Magnetic materials –
Part 15: Methods for the determination of the relative magnetic permeability of
feebly magnetic materials
Matériaux magnétiques –
Partie 15: Méthodes de détermination de la perméabilité magnétique relative des
matériaux faiblement magnétiques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.01; 29.030 ISBN 978-2-8322-3781-6

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60404-15:2012/AMD1:2016
© IEC 2016
FOREWORD

This amendment has been prepared by IEC technical committee 68: Magnetic alloys and

steels.
The text of this amendment is based on the following documents:
CDV Report on voting
68/531/CDV 68/544/RVC

Full information on the voting for the approval of this amendment can be found in the report

on voting indicated in the above table.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
___________
4.2 Principle
Replace the first sentence of the first paragraph with the following:

The relative magnetic permeability of a feebly magnetic test specimen is determined from the

magnetic polarization J and the corresponding magnetic field strength H measured using the

circuit shown in Figure 1 or Figure 5, using
Figure 1 – Circuit diagram for the solenoid method
Replace the existing title of Figure 1 with the following:

Figure 1 – Circuit diagram for the solenoid method with withdrawal of test specimen

Add a new Figure 5 with title and key, after Figure 1 and the note located below it, as follows:

---------------------- Page: 4 ----------------------
IEC 60404-15:2012/AMD1:2016 – 3 –
© IEC 2016
Air flux compensating coil
Test specimen
Flux coil
IEC
Key
A Current measuring device or ammeter
E d.c. power supply
F Flux integrator
N Solenoid
N Compensated search coil
R Variable resistor (controlling magnetizing current)
R Variable resistor (to adjust the output of the air flux compensating coil)
S Switch for reversing the current in the solenoid
Figure 5 – Circuit diagram for the solenoid method
with reversing of magnetizing current
Replace the existing Subclause 4.3.2 with the following:

4.3.2 Search coil for the solenoid method with withdrawal of test specimen. For the solenoid

method with withdrawal of test specimen, the search coil shall be wound on a nonmagnetic,

non-conducting former. Typically, for test specimens up to 30 mm in diameter, the internal

diameter of the aperture in the search coil is 32 mm to allow test specimens to be freely

inserted and withdrawn. The length of the winding shall be 40 mm; end cheeks of between

75 mm and 80 mm diameter shall be fitted to the former. The winding can be, for example,

10 000 turns of 0,2 mm diameter insulated wire with interleaving as necessary.
---------------------- Page: 5 ----------------------
– 4 – IEC 60404-15:2012/AMD1:2016
© IEC 2016

NOTE The winding can be tapped at intervals to facilitate the adjustment of the sensitivity of the measuring

system when determining the relative magnetic permeability of test specimens in the higher part of the permeability

range.
Insert, after 4.3.2, a new Subclause 4.3.7:

4.3.7 Search coil for the solenoid method with reversing of magnetizing current. For the

solenoid method with reversing of magnetizing current, the flux coil and the air flux

compensating coil shall each be wound on a non-magnetic, non-conducting former. The cross

section area of the flux coil shall be no more than ten times that of the test specimen and

there must be a sufficient number of turns for adequate resolution (typically >1 000 turns).

The flux coil should be no longer than 20 % of the test specimen length.

The flux coil and the air flux compensating coil are connected in series opposition to form a

compensated search coil. The length and effective area-turns of the flux coil and the air flux

compensating coil shall be nearly equal, with the area-turns of the air flux compensating coil

slightly larger than those of the flux coil so the compensating signal can be attenuated with a

variable resistor (R in Figure 5) to match the signal from the empty flux coil.

The air flux compensating coil shall be located a sufficient distance from the flux coil such that

there is no significant coupling to the magnetic flux of the test specimen. Coupling will change

the effectiveness of the compensation when a sample is present, and can cause significant

measurement error.

The signal from the air flux compensating coil shall be adjusted to exactly cancel the signal

from the empty flux coil. With no sample present, apply the highest magnetizing current to be

used in the test, reset the flux integrator, reverse the magnetizing current, and adjust the

variable resistor R to obtain the minimum output from the compensated coil set N . Repeat

c 2
as necessary until the output is as low as can be adjusted.

Replace the first paragraph (including Equation (2) and its key) of the existing Subclause

4.3.3 with the following:

4.3.3 Moment detection coil. For much shorter solid right cylinders with a length to diameter

ratio of 1:1, a moment detection coil with a homogeneous sensitivity over the volume of the

test specimen shall be used for measuring the magnetic dipole moment of the cylinder

(see Figure 2). The magnetic polarization is calculated from
(2)
where
J is the magnetic polarization (in T);
j is the magnetic dipole moment (in Wbm);
V is the volume of the test specimen (in m )
Replace the first sentence of the existing Subclause 4.5.1 with the following:

4.5.1 Cross-sectional area of test specimen. The cross-section area of the test specimen

shall be established from a number of measurements of each dimension.
---------------------- Page: 6 ----------------------
IEC 60404-15:2012/AMD1:2016 – 5 –
© IEC 2016
Replace the first sentence of the existing Subclause 4.5.2 with the following:

4.5.2 Calibration of flux integrator. The calibration of the flux integrator shall be established

with an uncertainty of ± 0,5 % or better.
Replace the first sentence of the existing Subclause 4.5.3 with the following:
4.5.3 Demagnetization of test specimen. The test specimen shall be demagnetized

immediately prior to the measurement from a magnetic field strength of not less than 20 kA/m

by the slow reversal of a gradually reducing direct current or a gradually reducing alternating

current (for the frequency, see next paragraph), provided the magnetic field produced by the

latter can completely penetrate the test specimen.

Delete the last five paragraphs and the note of the existing Subclause 4.5.3 (from "The

magnetic polarization shall be measured" to "avoid signal contributions from electrostatic

charges").
Add the following new Subclauses 4.5.4, 4.5.5, 4.5.6 and 4.5.7:

4.5.4 Measurement of magnetic polarization with withdrawal of the test specimen. The

magnetic polarization shall be measured by inserting the demagnetized test specimen into the

search coil or moment detection coil, adjust the magnetizing current to the required value

taking care not to overshoot, zero the flux integrator, withdraw the test specimen and record

the integrator reading. Care shall be taken to withdraw the test specimen from the search coil

or moment detection coil to a position where it no longer has an influence on the search coil

or moment detection coil, as indicated by the integrator reading.

The weight of the specimen can change the direction of the search coil axis used in the

solenoid method by a small amount during the withdrawal of the specimen, which leads to an

additional induced voltage in the search coil. Therefore the search coil should be fixed very

rigidly or
...

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