Re: Equivalent lumped inductance and toroidal coils

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Original poster: biomed-at-miseri.winnipeg.mb.ca 


Maybe I'm missing something but:

In this setup, a toriodal secondary with an air core,  most magnetic flux
generated by the primary will be lost.  I've seem the pictures on the net
of the setup, the primary covers maybe 20% of the secondary.  In a toriodal
transformer, the core confines and directs the fields, but in a toriodal
secondary, there is nothing to make the magnetic field cut across all of
the turns of the secondary.   Another thing is that to make one of these
things seems to be waste of effort, but a scientific curiousity.  By
winding in a curve, you shorten  the length of the 1/4 wavelength section
of the secondary and this would limit it's arc length, it makes  a bipolar
coil with a short air gap distance and twice as many winding as needed.


Shaun Epp