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DR Gearmotor Catalog 2008
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Project Planning for Gear Units
Service factor
5
5.4 Service factor
Determining the
The effect of the driven machine on the gear unit is taken into account to a sufficient level
service factor
of accuracy using the service factor The service factor is determined according to the
daily operating time and the starting frequency Z. Three load classifications are taken into account depending on the mass acceleration factor. You can read off the service factor applicable to your application in Figure 3 . The service factor determined from this diagram must be smaller than or equal to the service factor according to the selection tables.
M
•
f < M
m
a 'b
m
a max
00656BXX
Figure 3: Service factor f
B
* Daily operating time in hours/day
** Starting frequency Z: The cycles include all starting and braking procedures as well as changeovers from low to high speed and vice versa.
Load classification
Three load classifications are distinguished:
(I) Uniform, permitted mass acceleration factor < 0.2
(II) Non-uniform, permitted mass acceleration factor < 3
(III) Non-uniform, permitted mass acceleration factor < 10
43
Catalog - DR Gearmotors 01/2008
EURODI
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