Unique3phase Master Book Edition 3
Unique3phase Master Book Edition 3: Amazon.co.uk: Mr Douglas Arndt: Books
Unique3phase Master Book Edition 3: Amazon.co.uk: Mr Douglas Arndt: Books
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Sigh...
Y'know, I read these, and I'll accept them for what they are... and as much as I hate to be the one to stomp on anyone's daisies, I'm baffled by how a professor would actually grant 'credit' for the content. I wouldn't. They have plenty of math, structured tests with variables and controls, and in the end, they have conclusions, but read the introductions, and they're both totally missing their own points... the plane crashed before leaving the ground.
Right on, Rons. When somone posts that he wants to make a phase converter, Jerry should put a hold on the thread until the poster supplies a notarized statement that he has read and more or less understands
https://redirect.viglink.com/?forma...pdfs.semanticscholar.org/4f9...e4f666a5c6.pdf
pages 7 through 37, or has had someone explain it.
Consider the keyboard wear it would save us.
Bill
...
A prime example, is inductive reactance. You can't 'see' it, and when I'm standing in the front of a classroom teaching railway traction drive concepts, it takes basically an entire day of explaining it, with visual aids, just to illustrate the reality of how frequency and simple inductance result in impedance. For the sake of preventing total melt-down of my students' self-confidence, I will not even MENTION the concepts of distributed capacitance, inductance, eddy currents, or harmonics.
And finally Digger Doug.
Ell the Ice man is coming down the road.
please explain to a down under Aussie, cause I've got NO idea.
Jim
Sorry to hear about the brush fires, Jim... fortunately, you're not in California... there's still a few Aussies that know how to put out fires, I'm certain... In California, they complain about the fires, and being out of water, so the politicians raise taxes... and then it rains, they complain about the rain, and the mudslides, and forget about the water... and the politicians raise taxes. I suppose that if your bush fires continue, your government will either outlaw bushes, or require them to be equipped with fire extinguishers... but I digress, my apologies.
Bill- It was Hal Hibbard, president of Lockheed, who was quoted saying 'That damned swede" <Skunk Works director Kelly Johnson> "could SEE air'...
The F-117A was developed under name "Have Blue" under Kelly Johnson, and I would NOT be the least bit surprised if the same phrase was amended for the team members who were laying out the Ufimtsev theories into a workable format.
I think we pretty much all have a good handle on the concepts of inductive and capacitive reactance here... but I think we all realize that there's lots of guys that wanna be able to run three-phase stuff from a single phase source.
The disconnect, however, is wether something based on an entirely invisible realm can be successfully done WITHOUT having the ability, or the need to understand WHY it works.
Which brings me to what my core point.
I had more than one engineering professor (like Bill noted) in the category of one who obviously never actually ever BUILT anything... they went through school, then grad, then to tenure, likely without having accomplished anything more worthwhile than raking the leaves in their yard. If it ever came out, I'd be pleasantly surprised to find that my Engineering Problems and Solutions professor (who had a PhD in Crystalline Structures) would have succeeded in removing a fouled spark plug from a 3hp Briggs... but he was the type who couldn't find himself a way out of a bad conversation.
Anyway, this joker said something once, that I took EXTREME exception to:
"You can't successfully apply physics if you can't do the MATH".
The reason why I took exception, was in my proof:
Give a four-year-old boy a tennis ball, tell him to throw it at your head.
He will wind up, and knock you right in the noggin, and laugh... pick up the ball, and do it again, over and over.
He knows NOTHING of the mathematics of gravitational accelleration, nothing of wind resistance, or spin drift, doesn't know your exact distance, elevation difference, or departure vector, ancillary spin, or environmental factors, yet he laughs watching your eyes roll after getting biffed.
Turn the knob one more step backwards: A sparrow (regardless of wether African, or European)has no concept of NACA shapes, or the difference between lift and drag airfoil designs, nothing of gravity, air density, pressure, or even it's own power output... it doesn't have the slightest idea of it's own simple problem of weight ratios, it can still fly just fine with all that lack-of-physics-math. (just don't tie on a coconut).
The Fitch Williams rotary converter is a gadget that doesn't need to be understood, in order for someone to build one that is actually successful.
Having a document that goes into incredible depth of the science, does NOT put a common workshop guy in a position to throw a switch, spin up a motor, throw another switch, and turn on his mill.
It also serves no substantial purpose to saturate a man's grey matter with the intricacies of balancing capacitor calculations, because in REAL LIFE, unless you're running a constant-load machine, under non-changing circumstances, it's a moving target... and worst of all... the imbalance is entirely UN-critical to the end result.
As Ron put it... the guys that sell the 'kits'... some of them are doing a disservice by preying upon guys who simply don't know they're getting ripped-off. And I'll acknowledge and thank Kris for her kind words about my welder conversion writeups... they're not exactly in same realm, but I put a theory introduction in there that I figured mebbie 3% would get 'right off the bat', and 30% would get after looking at the drawings of current flow, and mebbie 50% would just follow the step-by-step and get success, while the remainder would either decide not to, or get partway in and run into some problem they either could solve, or would just give up...
and in doing so, resign myself to the fact that I helped out 83% to get a running machine, and SOME of them would go on to try, and prove, and publish results on similar machines.
Sometimes teaching and learning are easy. Most times, it's not so much, but it's worth it regardless.
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