Technical data
Manual – Gear Units and Gearmotors
99
7
Overhung loads (→ GM, → MM)
Project Planning for AC Motors
7.8 Overhung loads (→ GM, → MM)
Refer to the section "Project Planning for Gear Units"Overhung loads and axial forces/
for general information about overhung loads. The following table lists the permitted
overhung loads (top value) and axial forces (bottom value) of AC motors:
Overhung load
conversion for
off-center force
application
The permitted overhung loads must be calculated using the following formulae in the
event that force is not applied at the center of the shaft end. The smaller of the two
values F
xL
(according to bearing service life) and F
xW
(according to shaft strength) is the
permitted value for the overhung load at point x. Note that the calculations apply to M
N
.
F
xL
based on
bearing life
F
xW
from the shaft
strength
Mount-
ing
position
[rpm]
No. of
poles
Permitted overhung load F
R
[lb]
Permitted axial load F
A
[lb]; F
A_tension
= F
A_pressure
Size
63 71 80 90 100 112 132S
132ML
132M
160M 160L 180 200 225
250
280
Foot
mounted
motor
900
8
-
-
156
45
205
54
790
72
380
90
395
108
425
126
585
144
810
215
850
215
1260
1290
1350
450
-
-
-
-
1200
6
-
-
144
36
189
45
270
54
340
72
360
90
395
108
540
126
740
180
765
180
1120
250
1240
425
-
-
1800
560
1800
4
-
-
126
27
162
36
235
47
290
61
315
61
335
61
450
90
585
144
695
144
1010
210
1060
540
1570
540
1800
560
3600
2
-
-
90
18
117
22
162
33
215
43
220
45
245
47
325
72
450
108
515
108
775
180
830
415
-
-
-
-
Flange-
mounted
motor
900
8
-
-
191
56
260
67
3600
90
470
112
495
135
540
157
7220
180
1030
270
1080
270
1570
360
1690
560
-
-
-
-
1200
6
135
34
180
45
235
56
335
67
425
90
450
112
495
135
650
157
920
225
970
2250
1420
315
1530
540
-
-
2470
675
1800
4
112
25
157
31
200
45
290
56
370
79
395
79
425
79
560
112
720
180
880
180
1260
270
1330
675
1960
675
2020
585
3600
2
90
16
112
22
146
29
200
40
270
54
270
56
290
58
405
90
560
135
650
135
970
225
1030
515
-
-
-
-
F= F
xL R
•
a
b + x
[lb]
F
R
= Permitted overhung load (x = l/2) [lb]
x = Distance from the shaft shoulder to the force application point [in]
a, b, f = Motor constant for overhung load conversion [in]
c = Motor constant for overhung load conversion [in]
F=
xW
c • 10
3
f + x
[lb]