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This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Electromagnetically_excited_acoustic_noise_and_vibration


00:01:24 1 General explanation
00:03:27 2 Electromagnetic noise and vibrations in electric machines
00:04:58 3 Electromagnetic noise and vibrations in passive components
00:05:11 3.1 Inductors
00:05:36 3.2 Transformers
00:06:01 3.3 Capacitors
00:06:37 4 Resonance effect in electrical machines
00:07:26 5 Numerical simulation
00:07:36 5.1 Methodology
00:08:17 5.2 Application to electric machines
00:09:07 6 Examples of device subject to electromagnetic noise and vibrations
00:09:20 6.1 Static devices
00:10:08 6.2 Rotating devices
00:10:48 7 Sources of magnetic noise and vibrations in electric machines
00:11:52 8 Reduction of electromagnetic noise and vibrations
00:12:04 8.1 Reduction of magnetic noise and vibrations in electric machines
00:13:15 8.2 Reduction of "coil noise"
00:13:54 9 Experimental illustrations
00:14:21 9.1 Forced vibration by a rotating permanent magnet
00:14:48 9.2 Acoustic resonance by a variable frequency coil
00:15:32 10 Examples of audio files
00:15:42 10.1 PMSM motor (traction application)
00:15:53 11 External links
00:16:21 12 See also



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SUMMARY
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Electromagnetically excited acoustic noise is audible sound directly produced by materials vibrating under the excitation of electromagnetic forces.
Some examples of electromagnetically excited acoustic noise include the hum of transformers, the whine of some rotating electric machines, or the buzz of fluorescent lamps. The hissing of high voltage transmission lines is due to corona discharge, not magnetism.
The phenomenon is also called audible magnetic noise, electromagnetic acoustic noise, or electromagnetically-induced acoustic noise , or more rarely, electrical noise , "coil noise", or "coil whine", depending on the application. The term electromagnetic noise is generally avoided as the term is used in the field of electromagnetic compatibility, dealing with radio frequencies. The term electrical noise describes electrical perturbations occurring in electronic circuits, not sound. For the later use, the terms electromagnetic vibrations or magnetic vibrations , focusing on the structural phenomenon are less ambiguous.
Acoustic noise and vibrations due to electromagnetic forces can be seen as the reciprocal of microphonics, which describes how a mechanical vibration or acoustic noise can induce an undesired electrical perturbation.