Lenze DSD - Manual (Page 75)

Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
75
7 Applications
7.3 Belt drive, rotating
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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.
[7-9] 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 of the belt depends on the circumferential force F
Blt
≈ F
aux
to be transmitted and
on the positioning accuracy required and the permissible belt force.
• The pretension of the belt usually is 1 ... 1.2 × F
Blt
, in individual cases up to 2 × F
Blt
. This has to be
taken into consideration when the motor or gearbox is selected.
• If required, a transmission gear (see arrangement B) or a gearbox with reinforced bearings is to
be used.

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