18 - PVD 3661 MGV_ commisionning manual_March 2012.docx
3.4.5.
The permitted loads on the shaft are limited to low values low level (excepted with specific bearing), it is
mandatory to use a flexible coupling between the motor and the load.
Coupling
Different kind of couplings can be used like
bellow
coupling or disc coupling. They offer hard
torsion
stiffness.
To fit the coupling on the shaft, we recommend
using
shrink disc or locking assembly. Other devices
like
keyways are unbalanced and are not
compatible with the high speed.
To choose the coupling, all the components of the shaft line must be taken into
account: motor, load, load’s bearings, coupling, speed, acceleration, balancing,
alignment….
The coupling supplier can help to define the best coupling.
Warning
Thermal expansion can also generate strain and load.
: The coupling misalignment generates strains and loads on motor shaft depending
on the stiffness of the coupling.
These forces (axial and radial) must be below the maximum shaft allowed forces (§3.4).
Warning
: Parker will not be responsible for any motor shaft failure due to excessive strains
on the shaft .
3.4.6.
Pulley/belt
Warning
By limiting the speed and/or using specific bearing assemblies, it can be possible in some
cases to use pulley / belt systems. It is mandatory to raise a request to the factory before
doing so.
: The MGV motors are not designed to operate with pulley / belt systems.
