Explanation Of The Formula Abbreviations - Siemens SINAMICS S 1PH7 Configuration Manual

Mechanical properties of the motors
3.4 Radial and axial forces
Note
The radial forces at the shaft end must be precisely dimensioned according to the guidelines
specified by the belt manufacturer. The belt tension must be adjusted using the appropriate
measuring equipment.
Calculating the total radial force F
If the belt manufacturer has not provided accurate radial force data, then this can be
appropriately determined using the following formula:
F
R
Table 3- 11
abbreviations
c
F
U
P
n
D
60
for belt couplings
R
F
[N] = c ∙
U

Explanation of the formula abbreviations

Formula Units
-- Pre-tensioning factor: The pre-tensioning factor is an experience value
provided by the belt manufacturer. It can be assumed as follows:
For V belts: c = 1.5 to 2.5
for special plastic belts (flat belts), depending on the load type
and belt type c = 2.0 to 2.5
N Circumferential force
kW Motor output
rpm Motor speed
mm Diameter of belt pulley
F P
[N] = 2 ∙ 10 ∙ / (n ∙ D)
7
U
Configuration Manual, (APH7W), 04/2009, 6SN1197-0AD72-0BP0
Description
1PH7 induction motors (Machine tools)