[Prev][Next][Index][Thread]
Using ferrites and high energy materials
From: Scott Stephens[SMTP:stephens-at-enteract-dot-com]
Sent: Monday, November 24, 1997 5:52 PM
To: Tesla List
Subject: Using ferrites and high energy materials
Anyone ever put ferrite in their Tesla coil to increase power, increase
coupling, work better with solid state components?
How do I:
Estimate permiability/saturation?
If I have a block of dielectric somewhere between two plates, I can model it
by dividing the space into blocks, and treat each as a series - parallel
capacitor combination, right? If I stay in the coil, can I do the same with
magnetics for a rough estimate?
Insulating the core?
If I put 1 1/2"dia slug in 5" core, wrap with poly, will I see poly melt &
run out bottom, and core fill with smoke & plasma?
Increase coupling?
A chunk of ferrite between the primary and secondary would suck all the
field lines into it, and give much better coupling, maybe from a .02 to .2,
depending on geometry of course? But maybe with solid state coil, it would
be best to loosly couple violent discharges?
Saturating the core?
Maybe ferrites will work better with solid state CW and mild low duty-cycle
impulses, than highly-saturating extreme spark-gap impulses?
Heating/Burning the core?
Amidon says don't flux your kilo-gauss core over 500 gauss at 100KHz. Rules
made to be broken (periodicaly, anyways)?
Vibrating core elements?
Stress on air gap ultrasonicly cook spacer, losses and vibration isolation
needed? I though about powedering some iron and mixing it in plastic foam.
But I believe vibration would turn the magnetic energy into mechanical
energy, And my coil would puke out the core
Create hot zones along coil?
Can you see the slug position in the coil by the corona it makes on the
outside of the coil?
Strange modes?
Will using a few spaced, insulated lumped cores create an inductive lumps
along coil, which will end in a multi-pole filter needing tuning? Now add
some non-linear magnetic properties, and it will be a most interesting system.
A radar technique I've read of relies on this group-delay characteristic of
a dispersive transmission line. Transmit an FM chirp, starting with low
frequency and ending with High frequency. High freq. propagate faster, so
the long chirp comes out in a short impulse.
One neat thing about solid state, well-coupled coils could be as the core
saturate and permiability and impedance drops, more load will be placed on
the semi-conductors.
Maybe a 'smart' coil, using a programmed microcontroller or computer, would
'ring up' the coil and then blast an impulse to kick off the streamer.
Would a highly-saturating pulse overheat and destroy the core?