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The hum is generated by the magnetic field continually reversing at the frequency of the supply. 50Hz in Europe and 60Hz in the USA. This frequency is set by the speed of the turbines spinning magnets past wire coils of the alternators in the power stations.

The magnetic field in the AC machine or Transformers have coils which,although secured by being dipped in varnish, are still able to move slightly.The armature laminations are treated in a similar way but also vibrate at the line frequency and it is almost impossible to stop.You can only reduce it to a minimum by good design.

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15y ago

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