3.6.3 Sample calculation of the belt pre-tension
Note
Carefully comply with the guidelines provided by the belt manufacturer
• Carefully comply with the guidelines provided by the belt manufacture when conguring the
motor for radial forces at the shaft extension.
• Adjust the belt tension using the appropriate measuring instruments.
F
V
= 2 • M
0
• c / d
R
F
V
≤ F
R, perm
Table 3-2 Explanation of the formula abbreviations
Formula abbrevia‐
tions
Unit Description
F
V
N Belt pretension
M
0
Nm Motor static torque
c ––– Pre-tensioning factor; this factor is an empirical value provided by
the belt manufacturer. It can be assumed as follows:
for toothed belts: c = 1.5 to 2.2
for at belts c = 2.2 to 3.0
d
R
m Eective diameter of the belt pulley
F
R, perm
N Permissible radial force
When using other congurations, you must take into account the actual forces generated from
the torque being transferred.
Mechanical properties
3.6 Radial and axial forces
1FK2 Synchronous Motors for SINAMICS S120
50 Conguration Manual, 02/2022, A5E46927724B AD
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