Em 8/6/2012 12:18, RussellMc escreveu:

> For the device to be a motor if the rotor is still a rotor (and not
> clamped with stator as rotor as is done for some re-applications) then
> rotor can still be a brush fed "DC" magnet. Stator coils now have
> rotating field applied at full power and system should be able to be
> made to work OK.  This is NOT brushless but it uses sliprings and not
> commutator and electrical energy transfer to rotor is small % wise.
> Effiiciency needs to account for DC magnet drive but should be able to
> be "OK" [tm].
>
> If the rotor is re-fitted to have permanent magnets (as is sometimes
> done for alternator applications) a true BLDC can be produced.
> Efficiency seems likely to be similar to other implementations.
>
> I've copied this to a man who actually knows the real answer and it
> will be interesting to see what he says :-).
>
>
>               Russell



If the rotor is short-circuited, then we have a 3-phase induction motor...


Isaac

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