Hello there science physics research News group

Mentioned in a few earlier posts my interest in homopolar DC motors

I have a US patent number for some an example

5,977,684

[[Mod. note -- See
https://patents.google.com/patent/US5977684A/en
for the full text of the patent.
-- jt]]

If I understand this correctly it's all about the loop shape and the field shape and the way the two interact with each other

It's all about Lorent Force since faradays differential does not apply

Again I'm not an expert

Lawrence is usually on a circular loop

So imagine a circular loop swept around the major radius of a toroidal set
of coordinates. The loop would sweep out a toroidal shell.

Now we construct offset from the shell in the outward direction say a millimeter

A rather thick toroidal shell of something like neodymium ironboron met
glass your standard magnetic material

I've checked with Chinese manufacturers and yes this can be easily
manufactured in two halves that fit together pretty well so it's a
realizable the experiment in thinking

The necessary polling however is very weird and I just can't figure it out

How to magnetize such a thick toroidal shell such that all North Pole's
face inward towards the major diameter

You see if you stuff it that means stuff the toroidal shell with windings
which begin at the major diameter and continue in what is known as the
toroidal direction semi or figuratively parallel to the major diameter then
the field you get is inside the shell not at all inward

The only other option is the poloidal winding and that is the winding
direction around the circumference of the toroidal shell starting from some point offset towards the inside and ending near the inside of the shell

And of course since there is a Converse relationship to field you get that
way is a toroidal field which is parallel essentially or figuratively
parallel to the inner surface of the shell not at all useful

So if the winding of a motor a homopolar motor is a poloidal winding

How in this earth do you arrange a field for that winding to interact with?

The only thing I can think of is sort of overlapping flat coils
semi-parallel almost parallel to the plane of the major diameter which
would generate a standard bipolar field nesting into the inner surfaces of
the shell now adding windings to that in a very complicated way might
produce the required field but golly I'm only ordering one of these to do
the experiment so it seems like it's prohibitive. Prohibitively expensive
to have the thing polarized the right way

Of course external poles all oriented the right way would polarize the
toroidal show with a multiple pattern consisting of primarily poles
oriented inwards so that's an option maybe that's how the Chinese people
would do it I don't know

I'll work with them more to specify the field and also there is an American manufacturer I'm checking with

I just wanted to chat with the geometry people here about this problem of getting the field to face in words to be oriented inwardly

It's pretty daunting wouldn't you agree?




Other than that



Cheers, from Douglas

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Good morning physics research and the brilliant people there the readers

I've only had one espresso this time through

Moderator, thanks for that link


So I propose a toroidal shell with field oriented r radiallyy inwards towards the major diameter

I propose this because the optimum shape for the internal coil is spiral circular spiral

I say that because I have analyzed the design in the patent I mentioned
You see the field is going the wrong way for part of that square loop they've got there
Instead of a counter EMF there are segments with a forward EMF
Those segments might be called antipropulsive
They produce by Lawrence's law I'm sorry for the misspelling
Lenses l e n z apostrophe s arn sorry the microphone is so frustrating
I can't use keyboards right now my fingers are shaking

By lenses law darn it
By Lenzs law the net propulsive force is indeed in One direction
But like most homopolar motors the efficiency is low

I think this poloidal winding inside a toroidal shell would be highly efficient

It does require a highly improbable magnetic field

Maybe those of you with the stellarator or tokamak understanding can comment

That's all I wanted to add

It's a motor that works the way it tocamak s built I think I'm not sure

I sure would like to comment from someone here on that point


Other than that,


Happy New Year and cheers from Douglas

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)