Brush Motors

2 Pole Ferrite Magnets
Frame /
Dia. /
Mounting
Stack
Peak Stall
Torque
oz-in
Cont. Stall
Torque
oz-in
Rotor
Inertia
oz-in-sec2
Friction
Torque
oz-in
Thermal
Resistance
oC/Watt
Power
Range
(W)
Weight
lb
Max
RPM
C21
NEMA 23
180
30
0.0046
2
4.9
45
2.3
4500
280
40
0.006
2.5
4.4
62
2.7
4500
350
50
0.008
3
3.8
72
3.2
4500
420
70
0.011
3.5
2.9
92
4.8
4500
C26
145
30
0.003
3
5.2
40
2.5
4500
260
52
0.006
3.5
4.3
75
3.5
4500
350
70
0.008
4
3.7
100
4.5
4500
450
90
0.011
4.5
3.1
112
5.6
4500
C32
NEMA 34
500
95
0.032
6
3.1
105
7.3
4000
660
130
0.044
7
2.4
160
8.5
4000
880
176
0.056
8
2.0
225
9.3
4000
Magmotor Selection Guide
4 Pole Ferrite Magnets
Frame /
Dia. / Mounting
Stack
Peak Stall
Torque
oz-in
Cont. Stall
Torque
oz-in
Rotor
Inertia
oz-in-sec2
Friction
Torque
oz-in
Thermal
Resistance
oC/Watt
Power
Range
(W)
Weight
lb
Max
RPM
C33
NEMA 34
480
50
0.01
6
3.7
75
4.0
4000
850
90
0.02
7
2.9
120
5.2
4000
1200
130
0.025
7.5
2.3
150
7.5
4000
1250
172
0.04
8
1.8
180
9.0
4000
C40
NEMA 42
1200
248
0.16
12
2.0
275
10
3000
1984
416
0.24
14
1.3
430
13
3000
2480
512
0.30
16
0.98
570
15
3000
3040
640
0.37
18
0.79
720
17
3000
Magmotor Selection Guide
4 Pole Neodymium Magnets
Frame /
Dia. / Mounting
Stack
Peak Stall
Torque
oz-in
Cont. Stall
Torque
oz-in
Rotor
Inertia
oz-in-sec2
Friction
Torque
oz-in
Thermal
Resistance
oC/Watt
Power
Range
(W)
Weight
lb
Max
RPM
SR15
NEMA 17
75
10
0.00027
2
6.5
25
0.6
6000
120
15
0.0004
2.5
5
45
0.82
6000
135
20
0.0005
2.7
4.0
62
1.2
6000
150
25
0.0006
3
3.0
80
1.2
6000
S23
NEMA 23
500
50
0.006
5
4.5
70
2
4000
800
75
0.010
6
4.0
100
2.6
4000
1000
100
0.014
7
3.5
130
3.2
4000
S28
NEMA 34
900
80
0.01
6
3.7
80
3
4000
1300
130
0.02
7
2.9
150
4
4000
1500
200
0.025
8
2.3
200
5.5
4000
1700
250
0.04
9
1.8
250
6.8
4000
Magmotor Selection Guide

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