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 (continued)<br />
Brush<br />
Grade<br />
T825<br />
T869<br />
T900<br />
T959<br />
Graphite<br />
Brush<br />
Grade<br />
634<br />
H<br />
HRG<br />
K816<br />
PH<br />
R310<br />
R312<br />
R318<br />
R320<br />
R884<br />
T341<br />
T990<br />
Spec.<br />
Res.<br />
Ω-in.<br />
(µΩ-m)<br />
0.0025<br />
(58)<br />
0.0013<br />
(36)<br />
0.0020<br />
(51)<br />
0.0024<br />
(61)<br />
Spec.<br />
Res.<br />
Ω-in.<br />
(µΩ-m)<br />
0.0007<br />
(18)<br />
0.0010<br />
(28)<br />
0.0025<br />
(64)<br />
0.00036<br />
(13)<br />
0.0400<br />
(1016)<br />
0.0022<br />
(76)<br />
0.0020<br />
(51)<br />
0.0007<br />
(25)<br />
0.0013<br />
(33)<br />
0.0220<br />
(762)<br />
0.0020<br />
(51)<br />
0.0025<br />
(64)<br />
Dens.<br />
g/cm³<br />
1.69<br />
1.71<br />
1.68<br />
1.68<br />
Dens.<br />
g/cm³<br />
1.28<br />
1.36<br />
1.90<br />
1.83<br />
1.61<br />
1.75<br />
1.73<br />
1.75<br />
1.35<br />
1.62<br />
1.79<br />
1.83<br />
Trans.<br />
Strength<br />
lbf/in²<br />
(kgf/cm²)<br />
4200<br />
(359)<br />
4000<br />
(282)<br />
4500<br />
(317)<br />
4200<br />
(296)<br />
Trans.<br />
Strength<br />
lbf/in²<br />
(kgf/cm²<br />
750<br />
(53)<br />
1300<br />
(92)<br />
3000<br />
(211)<br />
2900<br />
(204)<br />
3300<br />
(232)<br />
3600<br />
(253)<br />
2400<br />
(169)<br />
3200<br />
(225)<br />
1000<br />
(70)<br />
3000<br />
(211)<br />
4500<br />
(317)<br />
3700<br />
(260)<br />
Con-<br />
tact<br />
Drop<br />
Con-<br />
tact<br />
Drop<br />
Friction<br />
VH L<br />
VH M<br />
VH M<br />
VH M<br />
Friction<br />
VH L<br />
VH M<br />
VH L<br />
M M<br />
VH L<br />
VH M<br />
VH M<br />
H M<br />
H M<br />
VH M<br />
VH M<br />
VH M<br />
Surface<br />
Speed<br />
ft/min<br />
(m/sec)<br />
10000<br />
(51)<br />
6000<br />
(30)<br />
8000<br />
(41)<br />
8000<br />
(41)<br />
Surface<br />
Speed<br />
ft/min<br />
(m/sec)<br />
16000<br />
(81)<br />
12000<br />
(61)<br />
8000<br />
(41)<br />
8000<br />
(41)<br />
6000<br />
(30)<br />
5000<br />
(25)<br />
6000<br />
(30)<br />
10000<br />
(51)<br />
12000<br />
(61)<br />
6000<br />
(30)<br />
6000<br />
(30)<br />
8000<br />
(41)<br />
Normal<br />
Current<br />
Density<br />
A/in²<br />
(A/cm²)<br />
80<br />
(12.5)<br />
70<br />
(11)<br />
80<br />
(12.5)<br />
80<br />
(12.5)<br />
Normal<br />
Current<br />
Density<br />
A/in²<br />
(A/cm²)<br />
65<br />
(10)<br />
55<br />
(8.5)<br />
65<br />
(10)<br />
65<br />
(10)<br />
40<br />
(6.2)<br />
45<br />
(7)<br />
55<br />
(8.5)<br />
65<br />
(10)<br />
65<br />
(10)<br />
55<br />
(8.5)<br />
55<br />
(8.5)<br />
80<br />
(12.5)<br />
Description <strong>and</strong> Application<br />
Recommended <strong>for</strong>:<br />
Off highway vehicle traction mo<strong>to</strong>rs under<br />
severe conditions of high temperature, low<br />
humidity, <strong>and</strong> heavy loads.<br />
Brass collec<strong>to</strong>r rings <strong>and</strong> medium-duty<br />
commutating service.<br />
Where excellent low humidity <strong>and</strong> high<br />
brush temperature are primary concerns.<br />
Used extensively in traction mo<strong>to</strong>r service.<br />
Traction mo<strong>to</strong>rs which require superior<br />
commutation <strong>and</strong> low friction under<br />
various duty cycles <strong>and</strong> low humidity<br />
conditions.<br />
Abra<br />
sive<br />
ness<br />
M<br />
M<br />
H<br />
M<br />
L<br />
L<br />
L<br />
M<br />
M<br />
M<br />
L<br />
M<br />
Description <strong>and</strong> Application<br />
Recommended <strong>for</strong>:<br />
High-speed slip rings on turbo<br />
alterna<strong>to</strong>rs around the world.<br />
High-speed service where scrubbing<br />
action required.<br />
Industrial application that require a high<br />
polishing action.<br />
Contaminated atmospheres <strong>for</strong> light<br />
loads <strong>and</strong> low-voltage machines.<br />
Where a very high contact drop is<br />
primary consideration. Recommended<br />
<strong>for</strong> FHP mo<strong>to</strong>rs with difficult<br />
commutating characteristics.<br />
Where exceptional riding <strong>and</strong><br />
commutating ability is required.<br />
Successful on 3600 RPM turbo exciters<br />
up <strong>to</strong> 60 kw size, mo<strong>to</strong>rs <strong>and</strong> genera<strong>to</strong>rs<br />
in paper mill, steel mill service.<br />
Similar <strong>to</strong> R310 but with greater load<br />
capacity.<br />
Steel slip rings of alterna<strong>to</strong>rs <strong>and</strong><br />
synchronous mo<strong>to</strong>rs.<br />
Where selectivity is primary concern.<br />
This grade has a very low coefficient of<br />
friction <strong>for</strong> high-speed service.<br />
Small, difficult <strong>to</strong> commutate machines<br />
such as amplidynes <strong>and</strong> noncommutating<br />
pole mo<strong>to</strong>rs used with<br />
SCR packages.<br />
Contaminated environments <strong>to</strong> reduce<br />
threading <strong>and</strong> improve brush life.<br />
Battery truck mo<strong>to</strong>rs where superior<br />
commutating ability is required.<br />
8<br />
9