Curious device

[Prajna]

You realise that once you start it you'll never be able to turn it off?

So, I have expended a little mental exertion on the problem of stopping the device.

The reason it runs (if it runs at all) is because the metal tabs are aligned with the converging parts of the cam tracks. It would be simple enough to mount the tabs on a ring that can be rotated independently but relative to the rotor so that the tabs align with the crossover (where the tracks switch from converging to diverging) rather than with the convergence. That will stop the device since it will block the repulsion where the tracks diverge. Rotating the control ring further will align the tabs with the diverging tracks, so the machine will run in reverse.

It could be arranged simply by using an eccentric cam that turns in a slot, biasing it in one direction or the other. A clamp could be arranged at the rotor axle so that closing the clamp rings rotates the cam so that the control ring miss-aligns with the converging sections of the cam tracks.

It will complicate the design a little, of course, for which I have already been criticised, however complication is necessary to some extent, so long as there is not more complication than is necessary to implement a feature then little can be done about that.

 

[PhillipM]

You can save some complication by not including that bit, because you'll never need it.

 

[Guineafowl]

@Guineafowl, yes, the initial setup could be simplified to test the principles but concerning the design posted above, what can be simplified?

You know perfectly well what I mean, you naughty boy

 

[Prajna]

I've updated the web page for the device detailing the control mechanism that allows the device to be started in forwards or reverse rotation and to be stopped when running. (Just in case anyone is interested.) I'm rather pleased with the way it has turned out and has fitted into the device and I think it is worthy of a patent by itself (if I was into patenting.)

The control system toggles the device off whether it is rotating forwards or backwards, is simple and has few moving parts.

Info at https://tomboy-pink.co.uk/sfmm/

Apologies to @Guineafowl, who I'm sure is still anxiously waiting for documented tests of the principle.

 

[Onoff]

I'm rather pleased with the way it has turned out and has fitted into the device and I think it is worthy of a patent by itself (if I was into patenting.)

Don't worry, the Chinese will do it for you.

 

[Screwdriver]

Getting it to stop is the last thing I'd be worried about.

 

[Guineafowl]

Apologies to @Guineafowl, who I'm sure is still anxiously waiting for documented tests of the principle.

That would be an ecumenical matter…

 

[reb78]

I've updated the web page for the device detailing the control mechanism that allows the device to be started in forwards or reverse rotation and to be stopped when running. (Just in case anyone is interested.) I'm rather pleased with the way it has turned out and has fitted into the device and I think it is worthy of a patent by itself (if I was into patenting.)

The control system toggles the device off whether it is rotating forwards or backwards, is simple and has few moving parts.

Info at https://tomboy-pink.co.uk/sfmm/

Apologies to @Guineafowl, who I'm sure is still anxiously waiting for documented tests of the principle.

Not to seem Impatient, but can you build a simple working model to prove the concept???!

 

[Prajna]

Not to seem Impatient, but can you build a simple working model to prove the concept???!

You do seem a tad impatient. I'm working on it. ETA for my 3D printer is tomorrow evening.

 

[Onoff]

You do seem a tad impatient. I'm working on it. ETA for my 3D printer is tomorrow evening.

To be fair at this rate I'll finish a project before you!

 

[hotponyshoes]

To be fair at this rate I'll finish a project before you!

I think Prajan has more chance of getting this working first...

 

[Dev]

I don’t know why but this came to mind

 

[Prajna]

By the way, @reb78, I have published the full CAD model on my GitHub (for the MK1 already and for the Mk2 soon) so feel free to build your own and test it if you are feeling impatient.

 

[My Old Landy]

By the way, @reb78, I have published the full CAD model on my GitHub (for the MK1 already and for the Mk2 soon) so feel free to build your own and test it if you are feeling impatient.

Can you link your GitHub, I enjoy building other people's projects. I am impartial on it's potential so will give it a good chance.

 

[Prajna]

Can you link your GitHub, I enjoy building other people's projects. I am impartial on it's potential so will give it a good chance.

GitHub - prajna-pranab/SFMM-Mk1: Switched Flux Magnetic Motor (SFMM)

Switched Flux Magnetic Motor (SFMM) . Contribute to prajna-pranab/SFMM-Mk1 development by creating an account on GitHub.

github.com

 

[Onoff]

My very uneducated understanding of "perpetual motion machines" is that without fail, they fail on the basis of you don't get something for nothing, a big dose of friction, air resistance etc. Thus they may work at or s time until they run out of energy.

Again a very uneducated assumption is they need extra energy in the form of a "little push". Thinking the Newton's Cradle.

Could the device in this thread benefit from extra, "free" energy from say wind or solar?

 

[Nomad]

Watching this with interest as any "perpetual motion" device fascinates me and I've had / seen a few over the years.

As a kid I had a "floating" (by magnets) spinning wheel similar to https://www.amazon.com/Flagest-Levi...l-Bookshelf/dp/B0B1LVQWC8/ref=sr_1_11?sr=8-11

I have a Cooks Radiometer on the window next to me, https://www.amazon.com/s?k=cookes+radiometer

A friend had a MOVA spinning globe and that's now on my wish list https://eu.movaglobes.com/

Articles below show how things have progressed ... nice !

Winner of the perpetual motion awards https://news.mit.edu/1999/perpetual-0519

Article & video of magnetic perpetual motion device - similar principle to @Prajna - magnets pull together - then reset - repeat https://www.greenoptimistic.com/real-working-magnetic-motor/

 

[hotponyshoes]

My very uneducated understanding of "perpetual motion machines" is that without fail, they fail on the basis of you don't get something for nothing, a big dose of friction, air resistance etc. Thus they may work at or s time until they run out of energy.

Again a very uneducated assumption is they need extra energy in the form of a "little push". Thinking the Newton's Cradle.

Could the device in this thread benefit from extra, "free" energy from say wind or solar?

It's the friction & resistance & etc. that's the killer.
Take this for example,


A fairly simple device consisting of an endless chain of balls/rollers, a 'lift' side and a coiled/helix ramp.
All the balls/rollers weigh the same.
12 balls being lifted, 2 on the flat, 44 going down.

The maths for this is fairly easy.
Say the balls are 10g each.
The total being lifted = 120g
If the down ramp is 45deg then the force exerted by the balls will be half (5g each)
So 44 balls will have 220g of downwards force.
More than enough to lift the 120g and cover the 2 balls on a flat surface.

Note, I'm not suggesting this is a free energy machine (just a pepertual motion one)
It will require energy input (from a push) to get it going.
It will require constant energy input from the earth's gravity to keep it moving.
It does not break any scientific laws.

Yet, mine still won't work?
Maybe I need to put it in a vacuum chamber to remove air resistant?
Maybe I need to make the balls from something denser? Carbide?
Highly polish them so the weight increases relative to the contact patch (effectively reducing the rolling resistance)
Or maybe make the balls into rollers with a concave center so they have very little contact?
Maybe too much friction in the links? Could I use magnets to link them somehow?

 

[Prajna]

Watching this with interest as any "perpetual motion" device fascinates me and I've had / seen a few over the years.

As a kid I had a "floating" (by magnets) spinning wheel similar to https://www.amazon.com/Flagest-Levi...l-Bookshelf/dp/B0B1LVQWC8/ref=sr_1_11?sr=8-11

I have a Cooks Radiometer on the window next to me, https://www.amazon.com/s?k=cookes+radiometer

A friend had a MOVA spinning globe and that's now on my wish list https://eu.movaglobes.com/

Articles below show how things have progressed ... nice !

Winner of the perpetual motion awards https://news.mit.edu/1999/perpetual-0519

Article & video of magnetic perpetual motion device - similar principle to @Prajna - magnets pull together - then reset - repeat https://www.greenoptimistic.com/real-working-magnetic-motor/

Thanks @Nomad, I'll take a look when I get a chance. Meanwhile, here's another link for you to add to your collection:

 

[Prajna]

My very uneducated understanding of "perpetual motion machines" is that without fail, they fail on the basis of you don't get something for nothing, a big dose of friction, air resistance etc. Thus they may work at or s time until they run out of energy.

Again a very uneducated assumption is they need extra energy in the form of a "little push". Thinking the Newton's Cradle.

Could the device in this thread benefit from extra, "free" energy from say wind or solar?

I think, from my analysis of the geometry, that the machine should work as soon as it's assembled with not even an initial push and that the magnets, in their different phases, should provide a near continuous force on the rotor. I may be wrong, of course, and I haven't yet done a torque calculation but it appears that all the forces (except at top dead center and bottom dead center) are acting in a convenient direction. So no, I don't think it needs any assistance.