[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

Original poster: "Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>

Tesla list wrote: 
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


Of course I assume that a solid iron core would not be used for anything
but DC...

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.


This does not exist. Any significant delay is caused by larger
inductance alone.

<>>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.


Good quality core materials can be used easily at hundreds of MHz.

Antonio Carlos M. de Queiroz