Mechanical properties of the motors
3.4 Radial and axial forces
1PH7 induction motors (Machine tools)
60 Configuration Manual, (APH7W), 04/2009, 6SN1197-0AD72-0BP0
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
R
for belt couplings
If the belt manufacturer has not provided accurate radial force data, then this can be
appropriately determined using the following formula:
F
R
[N] = c ∙
F
U
F
U
[N] = 2 ∙ 10
7
∙
P
/ (n ∙ D)
Table 3- 11 Explanation of the formula abbreviations
Formula
abbreviations
Units Description
c -- 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
F
U
N Circumferential force
P kW Motor output
n rpm Motor speed
D mm Diameter of belt pulley
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