How to Select Carbon Brushes for Motors and ... - Morgan AM&T

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Metal Graphite
Brush
Grade
537
AJT
ANK
AYK
F83
L4
M2650
M2665
M2675
M2688
M407
M540
M5N
M785
Spec.
Res.
Ω-in.
(µΩ-m)
0.0003
(8)
0.00016
(4)
0.000006
(0.2)
0.000044
(1.1)
0.0450
(1143)
0.000014
(0.38)
0.000125
(2.79)
0.000025
(0.76)
0.000008
(0.23)
0.000015
(0.38)
0.000008
(0.2)
0.000015
(0.38)
0.000012
(0.3)
0.00027
(7)
Dens.
g/cm³
2.77
3.00
4.95
2.64
2.02
4.57
2.80
3.50
4.25
5.40
5.10
5.40
5.91
3.20
Trans.
Strength
lbf/in²
(kgf/cm²
3200
(225)
4700
(331)
3500
(246)
5000
(352)
2300
(162)
3100
(218)
3500
(246)
3800
(268)
3200
(225)
8000
(563)
2400
(169)
8300
(584)
6000
(422)
3000
(211)
Grade Properties Tabulation Disclaimer
Con-
tact
Drop
Friction
VH M
L L
L L
M M
VH L
L H
L L
L VL
L L
L L
L M
L H
L M
L H
Surface
Speed
ft/min
(m/sec)
6000
(30)
6000
(30)
6000
(30)
4000
(20)
4000
(20)
5000
(25)
7000
(36)
6000
(30)
6000
(30)
6000
(30)
4500
(23)
5000
(25)
4000
(20)
6000
(30)
Normal
Current
Density
A/in²
(A/cm²)
100
(15.5)
100
(15.5)
150
(23.3)
100
(15.5)
40
(6.2)
125
(19.4)
100
(15.5)
110
(17)
125
(19.4)
150
(23.3)
150
(23.3)
140
(21.7)
150
(23.3)
100
(15.5)
Abra
siven
ess
%
Met
al
L 48
L
40
M 75
L 40
L 25
M 75
L 50
L 65
M 75
M 88
L 75
M 85
M 96
L 50
Description and Application
Recommended for:
24 – 50 volt DC motors and AC
motor collector rings where low
humidity protection is required.
High current/low voltage
motors exposed to high
altitudes.
Where high copper content
and low humidity protection is
needed.
Applications of wound rotor
motor rings up to 100 APSI.
Appliance motors and other
FHP applications and suitable
for low current densities.
Low-voltage motors,
particularly switch and signal
equipment. Also used on
plating generators up to 15 volt
and on brass slip rings of
induction motors.
Slip rings and low voltage
motors (24 – 72 volts).
Slip rings and low voltage
motors (6 – 24 volts).
Slip rings and low voltage
motors (6 – 24 volts). Also can
be used on slip ring
applications when higher
current density is needed.
Plating generators up to 15
volts and conductor rolls.
Where very low contact drop,
and low friction are required.
Also used on controllers and
control equipment.
Low-voltage machines and
grounding brushes.
Low voltage, high current
applications where long brush
life and minimum collector
wear is desired.
Low-voltage DC motors and
generators in the 24 to 72 volt
range and on brass slip rings
of induction motors.
The information contained in this tabulation of material properties is based on experimental and / or historical trends and indicates guidelines
for typical lots of materials. Choosing the correct grade for a particular application should not be based solely on physical properties. No
guarantee of these properties is given or implied.
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