Radial And Axial Forces; Calculating The Belt Pre-Tension; Radial Force Loading - Siemens 1FT7 Configuration Manual

Mechanical properties of the motors

3.6 Radial and axial forces

3.6 Radial and axial forces
3.6.1

Calculating the belt pre-tension

F
V
Table 3- 11
Formula abbreviations
F
V
M
0
c
d
R
F
R, perm
When using other configurations, the actual forces, generated from the torque being
transferred, must be taken into account.
3.6.2

Radial force loading

Point of application of radial forces F
● for average operating speeds
● for a nominal bearing lifetime of 25,000 h
64
[N] = 2 • M • c / d
0 R
Explanation of the formula abbreviations
Unit
N
Nm
–––
m
N
Figure 3-4 Force application point at the DE
F ≤ F
V R, perm
Description
Belt pre-tension
Motor static torque
Pre-tensioning factor: this factor is an empirical value provided
by the belt manufacturer. It can be assumed to be 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
at the shaft end
R
Configuration Manual, (PFT7S) 01/2009, 6SN1197-0AD13-0BP2
1FT7 Synchronous Motors