Technical Data and Characteristics
Cantilever force diagrams
1FK7 Synchronous Motors
3-44 Configuration Manual (PFK7), 10/2005 Edition, 6SN1197-0AD06-0BP1
3.4 Cantilever force diagrams
Cantilever force stressing
Point of application of cantilever forces F
Q
at the shaft end
• for average operating speeds
• for a nominal bearing lifetime of 20,000 h
Fig. 3-32 Force application point at the drive shaft end
Dimension x: Distance between the point of application of force F
Q
and the shaft shoulder
in mm.
Dimension l: Length of the shaft end in mm.
Calculating the pre-tensioned belt force
F
R
= 2•M
0
• c/d
R
When using other configurations, the actual forces that generated from the torque being
transferred must be taken into account.
F
R
≤ F
Qper
)
4
[
O
Table 3-22: Explanation of the formula abbreviations
Formula abbreviations Units Description
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
Empirical values for toothed belts: c = 1.5 to 2.2
Empirical values for toothed belts: c = 2.2 to 3.0
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