Em 9/3/2011 12:56, Andrew Wood escreveu:
> Ive been doing some reading up about this and Im a little confused as to=
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> whether its caused by an interaction between the magnetic field induced=20
> in the rotor pushing against the magnietic field from the stator or=20
> whether there is a thrust induced on the rotor itself just from the=20
> having current flow through it. Reading about Flemings Left hand rule=20
> suggests the latter but if that were so surely transformers and inductor=
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> coils would move!?


Yes, transformer and inductor coils want to move. They only don't
usually move because they are mechanically constrained.
But if a coil turn subjected to AC is loose, it may vibrate and suffer
mechanical fatigue or the enamel may wear due to the brushing against
other neighboring turns and create a short-circuit.

Isaac

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