Axial Force Stressing - Siemens 1FT7 Configuration Manual

Radial force, 1FT7 Compact, AH 100
Figure 3-9
3.6.4

Axial force stressing

When using, for example, helical toothed wheels as the drive element, in addition to the
radial force, there is also an axial force on the motor bearings. For axial forces, the spring-
loading of the bearings can be overcome so that the rotor is displaced corresponding to the
axial bearing play present.
Shaft height
36 and 48
63 to 100
An axial force as large as the spring-loading is not permitted (100 ... 500 N). Premature
failure is the result when the bearing is not pre-tensioned.
Calculating the permissible axial force: F
Motors with integrated holding brake cannot be subject to axial forces!
1FT7 Synchronous Motors
Configuration Manual, (PFT7S) 01/2009, 6SN1197-0AD13-0BP2
Radial force F at a distance x from the shaft shoulder for a statistical bearing lifetime of
R
25,000 h
Displacement
Approx. 0.2 mm
Approx. 0.35 mm
WARNING
Mechanical properties of the motors
= F • 0.35
A R
3.6 Radial and axial forces
67