Sample Calculation Of The Belt Pre-Tension - Siemens SIMOTICS S-1FK2 Configuration Manual

Mechanical properties
3.6 Radial and axial forces
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 configuring the
motor for radial forces at the shaft extension.
• Adjust the belt tension using the appropriate measuring instruments.
F = 2 • M
V
Table 3-2
Formula abbrevia‐
tions
F
V
M
0
c
d
R
F
R, perm
When using other configurations, you must take into account the actual forces generated from
the torque being transferred.
50
• c / d
0 R
Explanation of the formula abbreviations
Unit
N
Nm
–––
m
N
F ≤ F
V R, perm
Description
Belt pretension
Motor static torque
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 flat belts c = 2.2 to 3.0
Effective diameter of the belt pulley
Permissible radial force
1FK2 Synchronous Motors for SINAMICS S120
Configuration Manual, 02/2022, A5E46927724B AD