Misalignment; Flywheels - Siemens SINAMICS S 1PH7 Configuration Manual

Information for using the motors

7.9 Misalignment

7.9 Misalignment
7.9
In order to avoid misalignment or to keep it as low as possible, a compensating coupling
should be used (refer to the diagram).
If possible, the motor should not be directly and rigidly coupled to an output transmission
shaft which has its own bearings.
However, if a rigid coupling is absolutely necessary due to mechanical design reasons,
misalignment deviations must be avoided. In this case, a careful check must be made by
making the appropriate measurements.
Figure 7-2
7.10

Flywheels

7.10
Flywheels with a high mass, which are rigidly mounted to the end of the motor shaft, modify
the vibration characteristics of the motor and shift the critical rotational frequencies of the
motor into the lower speed ranges.
The overall system should be precision balanced in order to minimize/avoid exciting
vibration, when external masses are directly mounted onto the motor shaft.
Operation in the resonance range should be avoided.
232
Mechanical output transmission shaft with its own bearings and compensating coupling
1PH7 induction motors (Machine tools)
Configuration Manual, (APH7W), 04/2009, 6SN1197-0AD72-0BP0