3. Prediction of audible magnetic noise

Using expressions for magnetic line frequencies, simple graphical tools can be used to predict the appearance of resonances in the variable regime. If you want to obtain an estimate of the noise level, numerical simulation is essential. In both cases, it is necessary to calculate the main natural frequencies of the machine, which can be done using finite element software or analytically. As stated in the introduction, analytical methods are favored here for their computational speed, which enables noise to be simulated in variable regime and the model to be coupled with optimization tools.

3.1 Analytical calculation of natural frequencies

The natural frequencies of the machine's radial modes can be calculated analytically by assimilating it to a ring. We propose...

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Prediction of audible magnetic noise

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Bibliography

(1) - BERANEK (L.L.), VER (I.L.) - Noise and vibration control engineering (Ingénierie du contrôle des bruits et vibrations). - Wiley interscience (1992).
(2) - LE BESNERAIS (J.), FASQUELLE (A.), HECQUET (M.), LANFRANCHI (V.), BROCHET (P.),...

Standards and norms

Electric drive – Rotating electrical machines for rail and road vehicles – Part 2: AC motors powered by electronic converters - CEI 60349-2 - 2010
Machines électriques tournantes. Partie 9 : Limites de bruits - CEI 60034-9 - 2007
Rotating electrical machines. Part 14: Mechanical vibration of certain machines with shaft heights greater than or equal to 56 mm. – Vibration measurement, assessment and limits...