RE: What is Kickback?

To: tesla-at-pupman-dot-com
Subject: RE: What is Kickback?
From: "Joel Hinchman" <joel-at-molalla-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Sat, 08 Jan 2000 12:34:03 -0700
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hey now...!

As a newcomer to the field of coiling (no pun intended)...

Basically the thing known as kickback or inductive kick, is the effect which
occurs in an inductive circuit when the power is switched "off" abruptly.
This is because an inductor stores electromagnetic energy in its field in
the form of flux.  Since electromagnetic power generation is prescribed as a
voltage occurring when X number of lines of flux cut across a conductor on Y
amount of time...  The inductive kick occurs when the power is cut abruptly
and the coil field collapses.  As the invisible lines of flux jump back
through the coil windings they induce a brief voltage spike on the winding.
If left to its own devices- the effects of the kick are undesirable and
possibly destructive.

Joel Hinchman

-----Original Message-----
From:	Tesla List [mailto:tesla-at-pupman-dot-com]
Sent:	Friday, January 07, 2000 10:43 AM
To:	tesla-at-pupman-dot-com
Subject:	Re: What is Kickback?

Original Poster: "Grady Guard" <gradyguard-at-hotmail-dot-com>




>From: Tesla List <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: What is Kickback?
>Date: Thu, 06 Jan 2000 12:17:01 -0700
>
>Original Poster: "Lau, Gary" <Gary.Lau-at-compaq-dot-com>
>
>I see frequent references to "kickback", as something that caps and NST's
>need to be protected against.  Can somebody provide a concise definition of
>just what this is and its underlying mechanism?  Something that can be
>modeled with PSpice?  I want to understand if there really is such a thing,
>or is this just a reference to a streamer striking the primary circuit?
>Could it be due to the gap misfiring?  Streamer strikes aside, the only
>thing that I can see going from the secondary to the primary is, after
>quench, the primary and secondary inductors act as an untuned transformer,
>but I think the potential for primary damage is small due to the low
>efficiency of the untuned transformer.
>
>Thanks in advance,
>Gary Lau
>Waltham, MA USA
>
>Hi Gary,
Take a ign. coil or some other iron-core inductor, and touch the
leads to a battery while touching them. Then disconnect one of the
leads. This expirement will gain you infinite wisdom in the effects
of kickback. (just kidding!)
Grady


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