Lenze DSD - Manual (Page 86)

7 Applications
7.4 Omega belt drive
86
Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
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Consideration of the radial and axial forces on the bearings in the gearbox and motor
In addition to the torques to be transmitted, considering the radial and axial forces on the rotor is
also important for the selection of the gearbox and motor.
[7-25] Radial and axial forces
• The radial force on the motor/gearbox output shaft can increase up to double the pretension
F
prl,Blt
of the toothed belt.
• The pretension F
prl,Blt
depends on the circumferential force F
Blt
≈ F
D
to be transmitted and the
required positioning accuracy, and on the permissible belt force.
• The pretension F
prl,Blt
usually is 1 ... 1.2 × F
Blt
, in individual cases up to 2 × F
Blt
. This has to be tak-
en into consideration when the motor or gearbox is selected.
• If required, a transmission gear is to be used (see arrangement B).

Note!
This calculation currently cannot be carried out by the DSD.
Axial forces occur if the belt pulley is not in alignment. Avoid a belt pulley that is not in
alignment!
For these applications the axial forces can normally be disregarded.
 Toothed belt
M
Œ
F
rad
F
ax