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4.7 Radial and axial forces

4.7.1 Radial force

Do not exceed speci󹪝c radial forces in order to guarantee perfect operation.

Never exceed the minimum force for any of the di󹪜erent shaft heights. This minimum force 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 apply to 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, contact your local sales partner.

NOTICE

Premature damage to bearings and shaft breakage due to strong radial forces

Bearings can be prematurely damaged and shafts may break if force transmission elements

apply too much load to the shaft end as a result of radial forces.

• When using mechanical transmission elements, ensure that the maximum limit values

speci󹪝ed in the radial force diagrams are not exceeded.

NOTICE

Premature damage to bearings due to insu󹪟cient radial forces

Only for bearings with increased radial force (shaft height 100 to 280):

Insu󹪟ciently high radial forces can cause the bearings to roll in an unde󹪝ned fashion. This

results in increased bearing wear.

• For applications with an extremely low radial force load, ensure that the motor shaft is

subject to at least the minimum radial force speci󹪝ed in the diagrams.

Where the radial force load is less than the minimum radial force, e.g. on a coupling drive,

you must not use the bearings for increased radial force. Use a motor with standard bearings

for these applications.

NOTICE

Destruction of bearing seats

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. Rotating forces and imbalance can

also occur on coupling drives.

• Avoid rotating forces and imbalance.

Mechanical properties

4.7Radial and axial forces

1PH8 SIMOTICS M main motors

Con󹪝guration Manual, 12/2022, A5E51895839A 111

Siemens SIMOTICS M-1PH8 Configuration Manual

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