How to Select Carbon Brushes for Motors and ... - Morgan AM&T
How to Select Carbon Brushes for Motors and ... - Morgan AM&T
How to Select Carbon Brushes for Motors and ... - Morgan AM&T
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Electrographitic<br />
Brush<br />
Grade<br />
AY<br />
B344<br />
D<br />
DE2<br />
DE25<br />
DE3<br />
DE7<br />
DE7000<br />
DE8<br />
DE869<br />
DE9000<br />
F799<br />
G<br />
N19<br />
N38<br />
N39<br />
N44<br />
N48<br />
N6000<br />
Spec.<br />
Res.<br />
Ω-in.<br />
(µΩ-m)<br />
0.0004<br />
(10)<br />
0.0008<br />
(20)<br />
0.0005<br />
(18)<br />
0.0021<br />
(53)<br />
0.0025<br />
(64)<br />
0.0020<br />
(51)<br />
0.0025<br />
(58)<br />
0.0020<br />
(51)<br />
0.0020<br />
(51)<br />
0.0013<br />
(36)<br />
0.0020<br />
(51)<br />
0.0035<br />
(76)<br />
0.0013<br />
(36)<br />
0.0025<br />
(58)<br />
0.0020<br />
(51)<br />
0.00075<br />
(19)<br />
0.0024<br />
(61)<br />
0.0028<br />
(71)<br />
0.0026<br />
(66)<br />
(continued)<br />
Dens.<br />
g/cm³<br />
1.68<br />
1.65<br />
1.65<br />
1.64<br />
1.69<br />
1.62<br />
1.67<br />
1.67<br />
1.70<br />
1.71<br />
1.68<br />
1.65<br />
1.65<br />
1.61<br />
1.70<br />
1.77<br />
1.50<br />
1.58<br />
1.55<br />
Trans.<br />
Strength<br />
lbf/in²<br />
(kgf/cm²)<br />
3000<br />
(211)<br />
3700<br />
(260)<br />
4200<br />
(296)<br />
3700<br />
(260)<br />
4200<br />
(359)<br />
4500<br />
(317)<br />
4400<br />
(310)<br />
5500<br />
(387)<br />
5000<br />
(352)<br />
4000<br />
(282)<br />
5500<br />
(387)<br />
2800<br />
(197)<br />
3300<br />
(232)<br />
2800<br />
(197)<br />
5000<br />
(352)<br />
4700<br />
(331)<br />
1500<br />
(106)<br />
2000<br />
(141)<br />
2800<br />
(197)<br />
Con-<br />
tact<br />
Drop<br />
Friction<br />
H M<br />
H M<br />
H M<br />
VH L<br />
VH L<br />
VH L<br />
VH L<br />
VH L<br />
VH L<br />
H M<br />
VH L<br />
VH M<br />
VH M<br />
VH L<br />
VH L<br />
VH L<br />
VH L<br />
VH L<br />
VH L<br />
Surface<br />
Speed<br />
ft/min<br />
(m/sec)<br />
4000<br />
(20)<br />
6000<br />
(30)<br />
5000<br />
(25)<br />
8000<br />
(41)<br />
10000<br />
(51)<br />
8000<br />
(41)<br />
10000<br />
(51)<br />
10000<br />
(51)<br />
8000<br />
(41)<br />
6000<br />
(30)<br />
10000<br />
(51)<br />
7000<br />
(36)<br />
6000<br />
(30)<br />
8000<br />
(41)<br />
8000<br />
(41)<br />
10000<br />
(51)<br />
10000<br />
(51)<br />
10000<br />
(51)<br />
8000<br />
(41)<br />
Normal<br />
Current<br />
Density<br />
A/in²<br />
(A/cm²)<br />
80<br />
(12.5)<br />
80<br />
(12.5)<br />
80<br />
(12.5)<br />
80<br />
(12.5)<br />
80<br />
(12.5)<br />
80<br />
(12.5)<br />
80<br />
(12.5)<br />
80<br />
(12.5)<br />
80<br />
(12.5)<br />
70<br />
(11)<br />
80<br />
(12.5)<br />
70<br />
(11)<br />
70<br />
(11)<br />
75<br />
(12)<br />
80<br />
(12.5)<br />
80<br />
(12.5)<br />
80<br />
(12.5)<br />
80<br />
(12.5)<br />
80<br />
(12.5)<br />
Description <strong>and</strong> Application<br />
Recommended <strong>for</strong>:<br />
Steel or bronze field rings of<br />
synchronous mo<strong>to</strong>rs <strong>and</strong> wound ro<strong>to</strong>r<br />
mo<strong>to</strong>r rings up <strong>to</strong> 100 APSI <strong>and</strong> up <strong>to</strong><br />
4000 ft/min.<br />
Low voltage battery lift trucks where low<br />
contact drop is required.<br />
Steel <strong>and</strong> cast iron slip rings.<br />
Smaller diesel-electric locomotive main<br />
genera<strong>to</strong>rs <strong>and</strong> auxiliary equipment<br />
mo<strong>to</strong>rs <strong>and</strong> genera<strong>to</strong>rs.<br />
Traction <strong>and</strong> hoist mo<strong>to</strong>rs operating<br />
under severe conditions of temperature<br />
<strong>and</strong> low humidity.<br />
Transit traction mo<strong>to</strong>rs.<br />
Traction mo<strong>to</strong>rs <strong>and</strong> wheel mo<strong>to</strong>rs in off<br />
highway vehicles where high loads <strong>and</strong><br />
low humidity are present. Also suitable<br />
<strong>for</strong> mo<strong>to</strong>rs in transit applications.<br />
Diesel-electric traction mo<strong>to</strong>rs providing<br />
good commutation <strong>and</strong> long life.<br />
Larger diesel-electric locomotive main<br />
genera<strong>to</strong>rs, <strong>and</strong> other auxiliary<br />
equipment mo<strong>to</strong>rs <strong>and</strong> exciters.<br />
Brass collec<strong>to</strong>r rings, also used <strong>for</strong><br />
medium commutating service.<br />
High speed locomotive traction mo<strong>to</strong>r<br />
applications.<br />
Applications where friction chatter is<br />
encountered.<br />
Medium-duty commutating service.<br />
Medium <strong>to</strong> low current density<br />
applications with normal commutation<br />
requirements.<br />
Industrial genera<strong>to</strong>rs <strong>and</strong> exciters<br />
where long life is necessary .<br />
Exceptional ability <strong>to</strong> maintain film<br />
under lightly loaded conditions.<br />
Slip rings where a stabilized film is<br />
critical <strong>and</strong> long life is necessary.<br />
High commutating applications from<br />
large heavy duty mo<strong>to</strong>rs <strong>and</strong> genera<strong>to</strong>rs<br />
<strong>to</strong> less critical applications.<br />
Where excellent commutation is<br />
required <strong>and</strong> sustained high loads are<br />
present.<br />
Low or variable humidity conditions <strong>and</strong><br />
where long periods of light loading are<br />
a fac<strong>to</strong>r. Slight polishing action, also<br />
controls film in heavily loaded<br />
applications.<br />
6<br />
7