67 - PVD3627-August 2011
4.2.4.
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.
Alignment
The operation has to set:
- Axial alignment a
Radial alignment r
Angular alignment b
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
Variations in temperature generate strain and load due to the expansion.
: Coupling misalignment generates strain and load on motor shaft
depending on the rigidity of the coupling.
These forces (axial and radial) must not exceed the specified loads (§3.4).
Coupling misalignment generates also vibrations.
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 .
Danger : Coupling misalignment generates vibrations that can lead to a
shaft failure.
r
b
2 x b
a
