Re: Current Limiting and Impedence

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Harvey Norris <harvich@xxxxxxxxx>


--- Tesla list <tesla@xxxxxxxxxx> wrote:
Just a possible application for gapped ferromagnetic
inductors... A pole face rotor (DC field) from a large
alternator has appreciable gaps, The NS pole faces
with flux leakage at the gap weave in a zig zag
pattern; but the metal is not segmented silicone iron
like that of a transformer. One would probably need to
add a section with thicker wire in parallel to the
existant finer windings of the electromagnet. If the
pole face rotor in of itself does not offer enough
inductance, it could be reinserted into the alternator
stator ring assembly which reduces the air gap
considerably. If this offers too much inductance, one
could start shorting out each of the three phases to
reduce that inductance... Probably a silly idea, dont
know if it is practical. As a further experimental
modification you might decide to spin the AC pole face
assembly and ballast the cuurent through the fields
slip rings. With a DC field,it shouldnt take much spin
to create 60 hz on the stator outputs, a typical car
alternator has 7 pole faces per side, creating 7
cycles per revolution.  But here we are instead
inputing 60 hz AC into the field. Normally the
alternator is designed as an instrument to translate
DC into AC by motional emf, but if we instead inputed
AC into the field, then it becomes a combination of
both motional emf and time varying emf, as the
transformer model works only with time varying emf,
and not motional emf. By precise control of the field
rpm it might be possible to create a pulsed DC output
on one of the three stator phases. This would be a
sort of double negative principle, to time the rpm of
the field rotor so that when the stator output
normally reverses polarity, instead the field reverses
polarity, and thus the stator output instead puts out
an identical polarity pulse.
HDN