Electromagnetically-excited noise and vibrations in energy applications

Electric generators used in energy applications can involve electromagnetically-excited noise and vibrations, more especially due to noise and vibrations of electric machines.

Warranty periods of large electrical energy production units can reach 40 years, and down-time due to generator failures are extremely costly. High vibration levels increase mechanical fatigue and can lead to premature failure. Some generators close from citizens can also make unpleasant "humming noise" or "whining noise" depending on the working frequency. The acoustic standards for wind turbines are generally severe and the tonalities due to electrical noise can be detrimental. The underwater noise created by tidal generators can also disturb the marine environment.

To maximize the reliability and minimize the environmental impact of these electrical systems, one must identify and reduce their noise and vibration sources at design stage. The control of acoustic noise and vibration due to electromagnetic forces is important in the following examples:

- wind turbine generators (e.g. direct drive permanent magnet or doubly fed induction generators)
- hydroelectric dam generators
- tidal turbine generators

EOMYS can help to optimally design these electrical systems including noise & vibrations criteria based on engineering consulting activities or MANATEE software.

EOMYS can also solve technical issues after manufacturing using specialized electrical, vibration and acoustic measurements.

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