Technical data

n
1m
; n
2m
mean speed in section x
n
1
; n
2
processing speed
t
H1
; t
H1
run-up time
t
1
; t
2
processing time
t
B1
; t
B2
braking time
t
11
; t
22
standstill time
Fig.9-16: Mean speed
A complete processing cycle can consist of several sections with different
speeds. In this case, the average is to be generated from all the sections.
9.7.3 Bearing Lifetime
The bearing lifetime is an important criterion for the availability of IndraDyn mo-
tors.
If IndraDyn S-motors are operated within the limits specified for radial and axial
loads, the bearing lifetime is as follows:
L
10h
= 30 000 operating hours
(calculated according to ISO 281, ed. 12/1990)
This applies to all IndraDyn motors based on the following:
● The permitted loads from the corresponding chapter „Technical Data“ are
never exceeded.
● The motor is operated under the permitted conditions for use and in the
permitted ambient temperature range of 0° to +40° C.
● The „mean speed“ driven over the entire operating cycle conforms with
the characteristic curves for the grease lifetime from the corresponding
section „Technical Data“, whereby:
n
m
Mean speed
n
m(tf)
mean speed for which a grease lifetime of 30,000 h can be expected.
Fig.9-17: Mean speed
Differing loads can have the following effects:
● Premature failure of the bearing due to increased wear or mechanical
damage.
● Reduction of the grease lifetime leads to premature failure of the bearing.
● Avoid exceeding the load limits.
In other cases, the bearing lifetime is reduced as follows:
Bearing Lifetime
Mechanical bearing lifetime with in-
creased radial force
Project Planning Manual | Rexroth IndraDyn S Electric Drives
and Controls
| Bosch Rexroth AG 165/194
Operating Conditions and Application Notes