Alignment - Parker MGV Series Technical Manual

4.2.4.

Alignment

In order to control the loads applied on the motor shaft, the shafts must be aligned very
carefully, even if a flexible coupling system is used.
The operation has to set:
- Axial alignment a
a
As the total misalignment is a combination of the three misalignments (axial, radial,
angular), don't exceed, for each setting, 20% of the maximum value given by the coupling
device manufacturer.
The efforts on the shaft due to misalignments, taking into account the coupling stiffness,
must not exceed the specified values given for the motor (see §3.4 "Bearings").
Attention
depending on the rigidity of the coupling.
Variations in temperature generate strain and load due to the expansion.
These forces (axial and radial) must not exceed the specified loads (§3.4).
Coupling misalignment generates also vibrations.
Danger : Coupling misalignment generates vibrations that can lead to a
shaft failure.
Warning : Parker will not be responsible for any motor shaft fatigue due to
excessive strain on the shaft, a bad alignment or bad shaft line balancing .
Radial alignment r
: Coupling misalignment generates strain and load on motor shaft
67 - PVD3627-August 2011
Angular alignment b
b
r
2 x b