HEIDENHAIN TNC 410 M Technical Manual page 669

Axial and radial
forces 1FK7083-
5AF71
April 2007
Axial forces
When using, for example, helical gear wheels as driving elements, an axial
force acts on the motor bearing in addition to the radial force. When axial
forces occur, the spring loading of the bearing might be overcome so that the
rotor moves within the available axial play of the bearing (up to 0.2 mm).
An estimation of the permissible axial force can be calculated using the
following formula: F
A
Warning
Axial forces acting on motors with integrated holding brake are not allowed!
Radial forces
Point of the radial force:
The maximum permissible radial force may also depend on the motor speed
and the point of the radial force on the motor shaft. The point of the force is
defined by the distance Z and is shown as an axis in the load diagrams.
The maximum permissible radial forces F
are valid for a bearing service life of 20 000 h, depending on the point of the
radial force and the average speed.
SIEMENS Synchronous Motors, 1FK7xxx Series
= 0.35 * F
Q
Rmax
shown in the following diagram
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