26 | Flameproof motors
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5.1.4. ALIGNMENT/LEVELLING
Especially in cases of direct couplings, motor shaft
must be aligned axially and radially with the driven
machine shaft.
Incorrect alignment can lead to bearing damage,
vibrations or even cause shaft rupture.
Correct alignment can be ensured with the use of
dial gauges, as shown in Figure 5-5, Figure 5-6 and
Figure 5-7.
If considering a complete shaft turn, misalignment
should not exceed 0.03 mm.
Figure 5-5 - Axial reading (parallelism)
Figure 5-6 - Radial reading (concentricity)
Figure 5-7 - Axial and radial reading combined.
The axial alignment (dimension “E”) between the
half couplings should be performed in accordance
with its manufacturer recommendations.
When performing the alignment/leveling, the
influence of the temperature on the motor and
driven machine should be taken into consideration.
Expansion effect of the components may change
the alignment/leveling conditions during motor
operation.
After the set (motor and base) is perfectly aligned
either at cold or at hot condition, motor must be
bolted, as shown in Figure 5-8. There are
instruments which use visible laser ray added by
specific computer programs that can perform and
ensure high precision alignment.
Figure 5-8 - Alignment of motor and base
NOTE
Bolts, nuts and washers can be
supplied with the motor, if required.
ATTENTION
The motor feet must have a perfect
contact with the base. Soft-foot
verification shall be performed and, if
necessary, use shims.
ATTENTION
If required, WEG can offer its
personnel duly trained, as well as a
laser
equipment
to
make
the
alignment/leveling of the motor and
driven machine.
5.1.5. COUPLINGS
ATTENTION
As standard, WEG motors are factory
balanced with half key. This means
that couplings, pulleys, tooth wheels,
etc must also be balanced with half
key.