Lenzless rotation using radially (update: axially works too) magnetized PM.

[broli]

Speaker magnets often have a round slot into which the voice coil is put. The magnetism
is intended to be ACROSS this slot, rather than in/out of the device.

http://www.miknatisgrup.com/technical_info_genel.htm

Which one of those do you mean.

[Paul-R]

http://www.miknatisgrup.com/technical_info_genel.htm

Which one of those do you mean?

No. 3. Radially magnetised.
Have a look at this:
http://www.school-for-champions.com/science/images/electromagnetic_devices-loudspeaker.gif

You will see their intention; to provide a field across this slot, rather
than throwing the field out into the air.
Paul.

[broli]

Wow I fully understand what you mean! You are 100% correct, the field across these pieces is already radial. Which means we could just go back to the first design using this speaker trick.

Here's a must read website. http://www.moraalacoustics.com/MagnetAssy.htm

Instead of letting the current go in and out of the page from that perspective to push the coil up and down. The idea I proposed has the current going up and down from that perspective. Thus from a 3rd dimensional view a net torque is seen without any changing flux thus no lenz effect. I will make a diagram of this. Also this thread seems to be a bit too quiet. This idea is so simple and so logical (at least to me) that lots should be trying it. Since this is my real first experiment I'm going at a snails pace, but I'm getting there.

Edit: I just realized that the first design shouldn't work as the force on both sides is in the same direction and not opposite. I slipped up with the Lorentz force cross product. But all the other design's have correct logic.

[Paul-R]

Wow I fully understand what you mean! You are 100% correct, the field across these pieces is already radial. Which means we could just go back to the first design using this speaker trick.

It might pay you to have a telephone conversation with a senior research & development person
at B & W, who are on the south coast of England (Shoreham, Sussex). They might be willing
to put a few magnet samples in the post to you:
http://www.bowers-wilkins.co.uk/display.aspx?infid=1427
Paul.

[broli]

So far I did numerous experiments that show that a rotating magnet does not have a changing magnetic field (so no current is induced or dragged rotation like an induction motor). Tomorrow I might do the actual experiment shown in one of the designs. The problem is that this whole setup is unbelievably amateurish. And I don't know whether the 12V/5A car battery charger will do so I'm afraid of negative results due to mall engineering. I need bigger magnets, more tools and electrical equipment. I'm sure there are many here that can put this relatively simple setup together in mere hours.