Re: Voofee proof-of-concept
- Somehow this doesn't look right. It's too early in the morning for
me to be trying to think deeply! Sorry it doesn't appear to be
working because it looks like the torques would cancel in each turn
since the field reverses halfway thru the gap.
I better stick with getting a "true" radial gap motor to work!
Still, the basic idea is to shunt the field around the current return
wire (per turn) so it cannot interact with the field. This is to be
done by embedding each return wire in ferrous material of some kind.
--- In firstname.lastname@example.org, "Tom Schum" <thomasjschum@...>
> > --- In email@example.com, "voofee" <voofee@> wrote:
> > I think you'll find that to make it work you would have to build
> > windings that are topologically impossible.
> Getting back to the topology issue, imagine a speaker gap that has
> been enlarged so it is wider. Field lines bulge out of it, away
> the magnetic structure. Suppose the enlarged gap has a width of5mm
> and a diameter of 10 cm.the
> Take an air-core toroidal winding the same diameter as the gap, and
> place it in the region where the field lines bulge out. That is,
> diameter of the air core is the same as the diameter of the gappart
> (10cm), and the diameter of each turn on this core is maybe 5x the
> width of the gap (2.5cm).
> If you place this toroid very close to the gap, only the closest
> of the toroidal winding will be immersed in the extended field.the
> If the toroidal winding is then energized with DC, a net torque
> develops because the current return path for each turn is outside
> field lines of that gap.basic
> This is not a "true" radial field motor design, but you get the
> The idea is to prevent the return current from having as great an
> effect, so it cannot cancel the resultant torque entirely.
> Efficiency might be fairly low to begin with, but the basic idea
> be proven this way.build
> Does this take care of the topological problems?
> Tom Schum
> > > --- In firstname.lastname@example.org, "voofee" <voofee@> wrote:
> > > >
> > > > Hi Tom,
> > > >
> > > > I wouldn't spend any money on this.
> > > > I think you'll find that to make it work you would have to
> > > > windings that are topologically impossible.version
> > > >
> > > > Actually, I started thinking about this as a multi-turn
> of ajudgment.
> > > > homopolar motor; maybe a DC motor that only needs slip rings
> > > > of a commutator.
> > > > (I believe you could make a homopolar motor by having a copper
> > > > cylinder/rotor in the radial flux gap with a slip ring
> > > down
> > > > inside. Or, maybe the magnet assembly could be the rotor.)
> > > >
> > > > I got a little excited at one point, against my better
> > > > I had drilled 8 holes in the back plate of my speakerassembly.
> > > > I wound 8 radial coils of 5 turns each, like 8 spokes on awheel
> > > > passing through the gap.
> > > > When I sparked the windings to a car battery the 8 spokes
> moved, all
> > > > in the same direction attempting to orbit the center pole, as
> > > > expected. Of course the other end of the windings tried to
> orbit in
> > > > the opposite direction, but were constrained by the drilled
> > > > I then drilled a hole through the center pole and fitted a
> > > pin.
> > > > I put an iron hinge on the pin and positioned it overlapping
> one of
> > > > the windings.
> > > > I was thinking "right-hand rule."
> > > > Maybe that was my mistake.
> > > > When I sparked it, the windings move one way, and the hinge
> moved in
> > > > the opposite direction.
> > > > By golly, I thought, If I had better bearings so the hinge
> > > coast
> > > > to the next winding; or better yet, an iron plate to overlap
> all the
> > > > windings...HOT DOG!
> > > > But (sigh) when I moved the hinge 180deg to the other side it
> > > in
> > > > the SAME direction as the windings. Darn it!
> > > >
> > > > If you make it work, can I have an honorable mention on your
> > > > I have my original 1-page scribbles which I could post for the
> > > > historical records, if only I knew how.
> > > >
> > > > Voofee
> > > >
> > >
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