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Balancing of rotors

Aim:
due to mechanical and electrical construction reasons,  the  symmetry of rotors   in any rotating body  is not always perfect: the weight distributions are not perfectly uniform and may  create unbalances that  generate  inertia forces causing  cause vibration on the machine and  leading  to material fatigue failure.

Applicability:
Balancing tests are applicable to all rotating electrical machines, both synchronous and asynchronous, and to rotating components such as fans. 
For rotors weighing up to 10,000 kg and a rotation speed of 1,500 rpm.

Anomalies:
It is possible to detect unbalances of weight, static and dynamic, which may cause abnormal vibration during operation.Dynamic unbalances are proportional to angular velocity and to asymmetry: in some cases even a small unbalance may generate high stress levels.

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