Siemens SIMOTICS S-1FT7 - Shaft Extension; Radial and Axial Forces

Mechanical properties
3.6 Shaft extension
S-1FT7 synchronous motors
54 Configuration Manual, 09/2018, A5E45099423B AA
3.6
Shaft extension
The shaft extension at the DE is cylindrical according to DIN 748 Part 3, IEC 60072-1.
Standard: Plain shaft (without keyway)
Option: Keyway and feather key (half key balancing)
For fast acceleration levels and reversing operation, we recommend that you use friction-
locked shaft-hub coupling.
3.7
Radial and axial forces
As a result of the bearing arrangement, as described in Chapter "Bearing versions
(Page 52)" the motor is designed for vectored forces. Forces such as these occur, e.g. for a
belt drive.
All radial forces always involve vectored forces.
NOTICE
Motor damage caused by rotating forces
Rotating forces can result in bearing motion and in turn damage the motor.
• Rotating forces are not permissible.
3.7.1
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
V
= 2 • M
0
• c / d
R
F
V
≤ F
R, perm
Table 3- 13 Explanation of the formula abbreviations
Formula abbrevia-
tions
Unit
Description
F
V
N
Belt pretension
M
0
Nm
Motor static torque