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- To: Tesla List <tesla-at-pupman-dot-com>
- Subject: Re: Musein' and mathin'
- From: Greg Leyh <lod-at-pacbell-dot-net>
- Date: Wed, 12 Mar 1997 21:18:51 -0800
- References: <3326320D.4ECA-at-stic-dot-net>
Richard wrote: > All, > > What follows is a long and perhaps for some, tedious diatribe, but is speaks > to many points which I and others have labored over on this list in the last > year or so. [snip] > Thus the peak current which we might expect in the tank is based on the peak > capacitor voltage and the surge impedance. Such that... I peak = 21,000/50 or > 420 amps From this we compute peak impulse power = 420 X 21000 = 8.82 > megawatts!!!!! Shouldn't that be MVARs (Mega-Volt Amps Reactive), as the V and I aren't in phase? The MVARs in the primary, of course, do not represent the real power in the circuit. > Now do we really believe that we get this out the top of the coil? Do we > really even believe we really get this in the tank circuit? If we do we are > six times a fool. Let's examine our wrong turns. Was the math wrong. Math > is never wrong! Right? If the math is correct and based on solid physics > and electrical concepts, where did we do wrong? > > Answer. > > It started at the wall plug and went down hill from there. The biggest part > was the museins'- go back and count 'em. It continues with the assumptions. > (count them too.) and finally the math and its application is flawed. Each > equation taken by itself is rock solid and in an isolated ideal circuit > (like in the stinkin' college lab) always solves out fine. But all these > interact in a dynamic way that we did reckon or assume on. Pspice and its > ilk can help here but then there are those nasty museins' and assumptions. > This is were pspice and such programs can die on their mathematical vine. It's true that even the best circuit simulator cannot make up for sloppy circuit parameter modeling. No argument there. > > Richard Hull, TCBOR > > I still sorta think 3 megawatts peak is close. That's about what PSPICE says my 20" (360kHZ) coil puts out, in VARs. Say, you're not one of those closet PSPICE users, are you? -GL
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