AL S
08.95
AL S/2-8
Siemens AG 1997 All Rights reserved 6SN1197–0AA20
SIMODRIVE 611 (PJ)
The permissible cantilever forces are shown in the diagrams for the correspond-
ing motors.
Application point of the cantilever forces at the shaft end
At average operating speeds
For nominal bearing lifetimes of 20 000 h
F
Q
x
l
Fig. 2-6 Application point of cantilever forces at the shaft ends of motors
Dimension x: Distance between the application points of
force F
Q
and the shaft shoulder in mm.
Dimension l: Length of the shaft stump in mm.
Calculating the belt pre–tension:
F
R
= 2 M
0
c/d
R
F
R
[N] Belt pre–tension
M
0
[Nm] Motor stall torque
d
R
[m] Effective diameter of the belt pulley
c Pre–tensioning factor for the accelerating torque
Experience values for toothed belts c = 1.5 to 2.2
Experience values for flat belts c = 2.2 to 3.0
For other designs, the actual forces from the torque to be transferred should be
considered.
F
R
F
qperm.
Cantilever force
stressing
General information on AC servomotors
2.1 Definitions
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