IEC 60851-3:2009/AMD1:2013

IEC 60851-3 ®
Edition 3.0 2013-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
AMENDMENT 1
AMENDEMENT 1
Winding wires – Test methods –
Part 3: Mechanical properties
Fils de bobinage – Méthodes d'essai –
Partie 3: Propriétés mécaniques

IEC 60851-3:2009/A1:2013
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IEC 60851-3 ®
Edition 3.0 2013-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
AMENDMENT 1
AMENDEMENT 1
Winding wires – Test methods –

Part 3: Mechanical properties
Fils de bobinage – Méthodes d'essai –

Partie 3: Propriétés mécaniques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX H
ICS 29.060.10 ISBN 978-2-8322-1004-8

– 2 – 60851-3 Amend. 1 © IEC:2013
FOREWORD
This amendment has been prepared by IEC technical committee 55: Winding wires.
The text of this amendment is based on the following documents:
FDIS Report on voting
55/1392/FDIS 55/1407/RVD
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 amendment and the base publication will
remain unchanged until the stability date indicated on the IEC web site 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• withdrawn,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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
_____________
60851-3 Amend. 1 © IEC:2013 – 3 –
B.1 General
Replace this subclause by the following:
This annex provides recommendations to the purchaser and supplier of winding wires with
respect to friction test methods to be used for winding wires. The use of additional methods
can be agreed upon between purchaser and supplier.

B.4 Test C: Second dynamic coefficient of friction test method
Replace the entire clause by the following:
B.4 Test C: Second dynamic coefficient of friction test method (applicable to
enamelled round wires with a nominal conductor diameter from 0,050 mm
up to and including 1,600 mm)
B.4.1 Test equipment
The design of typical test equipment is illustrated in Figure B.3. Figure B.4 contains detailed
drawings of synthetic sapphires and Figure B.5 is a photograph of the load block. The tester
is supplied with a wire guiding system and a take-up which pulls the wire over the test bed at
15 m/min as shown in Figure B.6. The test block is aligned parallel with the test bed and the
test weights are perpendicular to the wire specimen.
As the wire is pulled under the test block (synthetic sapphires), the friction between the wire
surface and the sapphire surface develops a longitudinal force, which is transferred to the
measuring system by a shaft supported by two sets of linear ball bearings in contact with the
measuring system. The force indicated by the measuring system is divided by the load on the
test surface to obtain the dynamic coefficient of friction.
The measuring system in Figure B.3 shows the dynamic coefficient of friction tester with a
load cell in place to measure the force. An LVDT may also be used to measure the force
instead of a load cell. The electrical output from the force measurement device is fed into a
computer or into a microprocessor that collects data measurements, usually 1 000 points.
Statistics are performed on this data set so that proper interpretation of the results can be
made.
NOTE 1 Values for the dynamic coefficient of friction are characteristic of the type of lubrication and the magnet
wire specimen surface. The dynamic coefficient of friction values are generally not dependent on wire size.
NOTE 2 Wire lubricated with a mineral oil typically will have a mean dynamic coefficient of friction in the range of
0,9 to 0,16. Wire lubricated with a paraffin wax will typically have a mean dynamic coefficient of friction ranging
from 0,03 to 0,06 and will be more consistent in value as evidenced by a lower standard deviation. The mean
value, maximum value and standard deviation value can be used to evaluate the application of the lubricant to the
wire and smoothness of the wire surface.
The test procedure is designed to provide a measure of the lubrication and the film surface
smoothness as a combined value. It is assumed that the wire will be de-reeled from its
packaging with minimal contact with surfaces other than those associated with the tester and
packaging.
If there is suspicion that the presence of dust or dirt may have an effect on the coefficient of
friction, one or two outer layers of wire should be removed from the package and the sample
retested.
– 4 – 60851-3 Amend. 1 © IEC:2013
Test surfaces in contact with the wire shall be clean and dry at the start of each separate test.
The solvent used to clean the test load surface should remove the various types of lubricants
used and should dry without leaving a film residue.
B.4.2 Test specimen
The surface of the wire should be examined for damage, tangles, or excessive dust or dirt. If
any of these conditions are present, the top wire specimen layer of the spool should be
surfaced off before testing. The wire test specimen should be removed from the shipping
package by de-reeling over the end flange or pulling the wire from a pail or drum.
B.4.3 Specimen preparation
The wire specimen is pulled over a test bed surface under a test load (L). A frictional force
(F ) is developed between the wire surfaces and transferred to an appropriate measuring
d
device. The reading (F ) in grams-force is divided by the test load (L) in grams-force to obtain
d
the dynamic coefficient of friction µ .
d
F
d
μ =
d
L
A motor should pull the wire specimen at 15 ± 1,5 m/min across a smooth surface using a
motor driven take-up.
Various load weights should be available that will provide 100 – 1 000 grams-force.
The test block should be comprised of two mounted synthetic sapphires that have a surface
roughness of not more than 2,4 microns. The sapphires are described in Figure B.4 and are
mounted in accordance with Figure B.5.
There should be a means to guide the wire and a means to maintain a slight tension if
needed.
An electrical force measuring device or transducer measures the force due to friction. A force
transducer with a range of 0 – 500 grams-force, a data storage device, and a microprocessor
or computer to statistically analyse the data sets should be installed.
A mechanical dampening system consisting of a paddle and a container filled with oil may be
used. The electrical signals from the load cell or LVDT can also be dampened electronically.
A cleaning solvent appropriate for dissolving the lubricant being tested should be used for
cleaning the sapphires and metal surfaces between tests.
B.4.4 Procedure
The coefficient of friction tester should be level so that the only force being measured by the
pressure transducer is that which is perpendicular to the load being applied and that gravity is
not a factor.
Calibrate the pressure transducer by setting the zero without any load, and setting the span
by hanging a 100 or 200 gram weight. Remove the weight and the display should again read
zero.
Enter the parameters of the test into the microprocessor or personal computer.
De-reel the wire from its packaging by pulling the wire over the flange, through the tensioning
device, through the guides, and onto the take-up spindle.

60851-3 Amend. 1 © IEC:2013 – 5 –
Adjust the guide pulleys so that the wire is parallel with the test bed. Clean the test bed, any
guide pulleys, and the sapphire surfaces with a suitable solvent.
Place the appropriate weight from Table B.1 onto the load block:
Table B.1 – Load block weights for dynamic coefficient of friction testing
Conductor diameter Weight
mm g
0,050 – 0,071 100
0,071 – 0,125 200
0,125 – 0,450 600
0,450 – 1,600 1 000
Adjust the test bed to make the test load parallel with the test surface. Turn the wire take up
on and start collecting data after the setup is stable and aligned and continue until the desired
number of data points has been stored.
Analyse the data for minimum reading, maximum reading, mean value, and standard
deviation.
The dynamic coefficient of friction µ should be calculated as follows:
d
F
d
μ =
d
L
where
F = force reading in grams f
...