What are the reasons for abnormal sound or noise?

1.	What are the reasons for abnormal sound or noise?
Answer» Motors in general should run very quietly and no abnormal noise is desired. However if noise is there, it could be because of following reasons. a. Windage noise – the noise due to ventilating system, (whistling noise). b. Bearing noise – the noise due to its rolling contact. c. Unusual noise – some defects inside the motor (example – motor bar failure). d. Deep heavy growling noises – some electrical fault. For permissible limits of noise levels for rotating electrical machines IS: 12065:1987 is being reffered.

Answer»

Motors in general should run very quietly and no abnormal noise is desired. However if noise is there, it could be because of following reasons.

a. Windage noise – the noise due to ventilating system, (whistling noise).

b. Bearing noise – the noise due to its rolling contact.

c. Unusual noise – some defects inside the motor (example – motor bar failure).

d. Deep heavy growling noises – some electrical fault.

For permissible limits of noise levels for rotating electrical machines IS: 12065:1987 is being reffered.

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