Radial And Axial Forces; Radial Force (Cantilever Force) - Siemens SINAMICS S 1PH7 Configuration Manual

3.4

Radial and axial forces

3.4
3.4.1

Radial force (cantilever force)

Specific radial forces may not be exceeded in order to guarantee perfect operation.
For various shaft heights, a minimum force may not be fallen below. This is indicated in the
radial force diagrams. The diagrams show the radial force F
● at various operating speeds
● as a function of the bearing lifetime
The force diagrams and tables only apply to the standard shaft ends at the DE. For smaller
shaft diameters, only reduced radial forces may be transmitted or none at all.
For force levels going beyond these, please contact your local Siemens office.
For coupling output and belt coupling
If mechanical transmission elements are used which subject the shaft end to a radial force,
it must be ensured that the maximum limit values specified in the radial force diagrams are
not exceeded.
Bearings for belt coupling (shaft heights 180 to 225):
For applications with an extremely low radial force load, it should be ensured that the motor
shaft is subject to a minimum radial force load as specified in the diagrams. Low radial
forces can cause the bearings to roll in an undefined fashion which results in increased
bearing wear.
For applications with radial force loads, which are less than the specified minimum radial
forces (e.g. coupling output), then the bearings may not be used for belt couplings. For
applications such as these, the induction motor must be ordered with bearings for coupling
output.
CAUTION
Rotating forces
The motor bearings are designed for operation with radial force. Rotating forces from the
process or imbalance > Q 2.5 can destroy the bearing seats and must therefore be
avoided.
When using elements which increase the force/torque (e.g. gearboxes, brakes) then it must
be ensured that the higher forces are not absorbed through the motor.
1PH7 induction motors (Machine tools)
Configuration Manual, (APH7W), 04/2009, 6SN1197-0AD72-0BP0
CAUTION
CAUTION
Mechanical properties of the motors
3.4 Radial and axial forces
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