Lenze DSD - Manual (Page 334)

11 Drive Dimensioning
11.4 Lenze gearbox selection
334
Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
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11.4.1.2 Alternating load and repeated load cycle with regard to toothed gearboxes
In case of a torque reversal (sign reversal), the gearbox is operated with alternating load. In case of
a periodic alternating load (frequently, regularly), the max. permissible torque M
max,out
is evaluated
with the alternating load factor k
alt
.
Alternating loads are calculated in the DSD and considered in the drive dimensioning phase.
If the alternating load was not considered, the gearbox would be operated in the fatique strength
range. For a highly dynamic application with a cycle time of 1 s, the gearbox would have reached
the end of the fatigue strength after an operating time of less than 1000 h.
Calculation of the alternating load
[11-11] Calculation of the alternating load
M
max,out
Max. permissible torque at the output end
M
alt,out
Max. torque at the output end in opposite direction to M
max,out
(|M
alt,out
| ≤ |M
max,out
|)
M
per,out
Rated torque at the output end
k
alt
Alternating load factor
M
max,out
M
per,out
k
alt
-------------------- ≤
k
alt
1 0.4
M
alt,out
M
max,out
------------------------- ⋅ + =