LENZE
1
1-10
Small drives en 07/2010
General information
Dimensioning of geared motors and gearboxes
Duty
Type of load
Intensity
class
I
Smooth operation, minor or negligible shocks
F
I
≤ 1.25
II
Irregular operation, average shocks
1.25 < F
I
≤ 4
III
Irregular operation, major shocks
F
I
> 4
and/or alternating loads
1. Calculate the required load capacity
[
[
[
8 h
16 h
24 h
Application factor
Operations/hour
III
II
I
Operating time/day
100
200
300
400
500
600
700
800
900
1000
1200
1500 1/h
0
0.8
0.9
1.0
1.0
1.1
1.1
1.2
1.2
1.2
1.3
1.3
1.3
1.4
1.4
1.4
1.5
1.5
1.5
1.6
1.6
1.6
1.7
1.7
1.8
Work out the output torque
M
2
and speed
n
2
required
Calculate the duty class:
Calculate the temporal factors:
˘
Operating time/day
˘
Switching operations/hour
Use the diagram to determine the application factor k of the machine
Requirement for geared motor: c (selection table) ≥ k
Requirement for gearbox: M
2 perm
(selection table) ≥ M
2
· k
[
[
[
[
F
I
(geared motor) =
J
ext
+ J
mot
J
mot
F
I
(gearbox) =
J
ext
+ J
A
J
A
Calculate the required motor power
P
1
=
M
2
· n
2
9550 ·
³