However, if a rigid coupling is absolutely necessary for mechanical design reasons,
misalignment deviations must be avoided. In this case, a careful check must be made by
making the appropriate measurements.
Vertical and horizontal alignment
The following measures are required to compensate for any radial oset at the coupling and
to horizontally adjust the electric motor with respect to the driven load:
• Place shims under the motor feet to position it vertically and to prevent stress in the machine.
The number of shims should be kept as low as possible, so use as few thicker shims as possible
instead of several thinner shims.
• For horizontal positioning, push the motor sideways on the foundation Pay attention to
maintaining the axial position.
• When positioning the motor, ensure that a uniform axial gap is maintained around the
coupling. Note on alignment accuracy: Remember to take account of data concerning the
alignment accuracy of the driven load and the coupling.
Alignment accuracy
1. Align the motors with coupling output in such a manner that the center lines of the shafts are
parallel with no oset. This ensures that no additional forces aect their bearings during
operation.
2. Perform the ne adjustments with shims under the entire motor foot.
Figure4-65 Aligning the drive
Mechanical properties
4.10Vibration response
1PH8 SIMOTICS M main motors
150 Conguration Manual, 12/2022, A5E51895839A
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