Re: rotating magnetic field

On Wed, 3 Jun 2009 20:53:12 -0700 Don Kelly <dhky@xxxxxxx> wrote:

| Now you have pissed me off. I had actually dismissed and forgotten your
| contentions there. I dealt with them before- If you prefer to hand-wave,
| that is your prerogative- If I choose to ignore the hand-waving -that is
| mine. Since there is no evidence that rotating the magnet rotates the field,
| then it is up to you to obtain such evidence. Until then , you are simply
| blowing bubbles in the bathtub.

Strange, considering my calmness and lack of any emotion in this whole thread.

The "evidence" is that if it does not, there is a contradiction in physics.
I explained it in a couple previous posts, and I posted it again just this
evening in this thread.


| This was dealt with long ago as were some of your ideas about magnetic
| circuits/devices.

And which were those?


|> Well, then you added on to it that you did not want to accept that volts
|> divided by amps gives ohms in all cases (even if those ohms are not series
|> resistance ohms in some cases).
| ----------
| I have no problem with V/I having the units of ohms. (in fact the ohm is
| defined as volt/ampere. Ohm found a linear relationship V=RI and defined
| the slope of the line as V/I or volts/ampere - later called the Ohm.

Then you should have no problem making a reference to system A that has a
higher V/I ratio (compared to system B with a lower V/I ratio) has being
one of a higher number of ohms ... a higher impedance.


| That doesn't mean that an ideal source E driving a current I through an
| external circuit is a resistor (and particularly not one that obeys Ohm's
| law). It is useless to think of it that way as it gives no useful
| information. I have iterated this before and that is the point that you have
| repeatedly missed.

I never said the source was a resistor. I characterized the system as one
of a higher impedance. That doesn't mean it is a resistor. Even if the
generator is entirely a superconductor, it will still be part of a system of
a specific impedance when it has a specific voltage / current ratio, which
in such a case (superconductor) is determined by the transmission line loss
and load impedance. If the transmission line is also a superconductor, then
it is just about the load impedance alone (in steady state DC where inductive
and capacitive effects do not apply).

Of course, if the load is a superconductor, it isn't much of a load. You
have to have some kind of voltage / current ratio there to transfer power,
be that a form of resistance, or something else.


| Now, given a complex network of sources and impedances, the Thevenin (the
| concept that you don't want to deal with as it is real world) model reduces
| to an ideal source behind a (constant) impedance AS SEEN FROM THE LOAD. It
| tells nothing about what is actually behind the connection point and the
| load doesn't give a damn. Again, that is the point thatr I made and you
| missed.

The Thevenin model is simply not something I referred to. You can use it in
whatever kind of analysis you want.


| Nor do I believe in your (infinite) Transmission line concept - particularly
| as the behaviour of a generator connected to a load is not characteristic
| of a transmission line. By the way, when you get reflections at the
| terminals of a transmission line, it is still a transmission line. This and
| other comments indicate that you really don't get it.

If you don't believe in infinite transmission line concepts, then I guess you
don't know transmission lines. This is a concept that has been around for a
long time. I did not invent it. I first read about it around 1970 or so, and
finally understood it in the early 1980's.


| There are a few other things but you really have exhibited a lack of
| understanding choosing to ignore the physics (and the math involved as a
| non-hand-waving language that is world wide) that accurately model what goes
| on, choosing to come up with complex and generally incorrect approaches to a
| simple situation. God only knows how you would deal with power system load
| flow (again based on incorrect things that you have said).

Do you even have a BASIC list of specific facts I have stated incorrectly?
Or are they just a bunch of concepts that are being misapplied as if they are
some other concept?

--
|WARNING: Due to extreme spam, googlegroups.com is blocked. Due to ignorance |
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| Usenet from these places, find another Usenet provider ASAP. |
| Phil Howard KA9WGN (email for humans: first name in lower case at ipal.net) |
.

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