47 - PVD3627-August 2011
3.3.3.
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 stiffness of the coupling.
These forces (axial and radial) must be below maximum shaft allowed
forces (§3.4).
Warning
: Parker will not be responsible for any motor shaft failure due
to excessive strain on the shaft .
3.3.4.
The MGV motors are not designed to operate with pulley / belt systems.
Pulley/belt
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.
