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Re: Why tesla coil is air-cored to operate efficiently at high freq?



Original poster: dave pierson <davep@xxxxxxxx>


This is not necessarily true... Assuming reasonable linearity, all
that a core does in an inductor is to increase its inductance for
a given shape and number of turns.

And increase the losses, due to eddy currents, (amount depends on core material and frequencies of interest

The current grows exactly as in an air-core coil, more slowly due to

the higher inductance.

And the slowere response time of the core, depending on the material.

<>>But in a transformer, if the magnetizing inductance (the inductance of
>the primary coil) is increased, the transformer works more close
>to an ideal transformer, and so a core is a good thing.
   If the associated losses and frequency reponse limits are acceptable.
   best
      dwp