9.11
Attaching Drive Elements
Whenever attaching drive elements to the output shaft, such as
●
gearboxes
●
couplings
●
gear pinions
it is imperative that the following notes are observed.
Gearbox mounting on motors
Are gearboxes mounted on motors, the thermal coupling of the motors on
machines or constructions changes.
Depending on the gearbox type, the heat development on the gearbox is dif‐
ferent. The heat dissipation of the motor via the flange is reduced in every
case when a gearbox is mounted. This must be heeded at the project plan‐
ning.
A reduction of the given performance data is necessary, to do not overload
motors when using gearboxes.
Fig.9-19:
S1 characteristic curve of gearboxes
The indicated torques in the characteristic curves of the motor
have to be reduced by 10-20% when mounting gearboxes.
Please, heed all further notes and specifications within this documentation for
the used gearboxes.
Overdefined bearing
Generally, redundant bearings are to be avoided by all means when connect‐
ing drive elements. The tolerances inevitably present in such cases will lead
to additional forces acting on the bearing of the motor shaft and, as the case
may be, to a distinctly reduced service life of the bearing.
If redundant attachment cannot be avoided, it is absolutely neces‐
sary to consult with Bosch Rexroth.
Couplings
The machine construction and the drive elements used must be carefully
adapted to the motor type so as to make sure that the load limits of the shaft
and the bearing are not exceeded.
When extremely stiff couplings are attached, the radial force
which constantly changes the angular position may cause an im‐
permissibly high load on the shaft and bearing.
DOK-MOTOR*-MKE*GEN2***-PR06-EN-P
Rexroth MKE Synchronous Motors for Potentially Explosive Areas acc. to ATEX and UL/CSA
Bosch Rexroth AG
89/135
Operating Conditions and Application Notes
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