Siemens SIMOTICS S-1FK2 - Sample Calculation of the Belt Pre-Tension

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 con󹪝guring 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 E󹪜ective diameter of the belt pulley
F
R, perm
N Permissible radial force
When using other con󹪝gurations, 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 Con󹪝guration Manual, 02/2022, A5E46927724B AD