The drawing is just an example, and I drew it in under 3 minutes... I intend to wind it with at least two layers, overlapping them both one wire (tube) diameter out of phase, so as to make sure there are no magnetic field leaks, if possible.Most of the field would be inside the toroid, but some would leak out if it looks like the drawing. Assuming that leakage and the magnet are symmetrical, there will be no torque.
I saw a magnet makers site a few months ago. Are you willing to buy online?Step ONE: find a large diametrically magnetized neodymium magnet... I found a place that sells them but only up to 1 inch in diameter. Does anyone know where I could find larger ones?
You mean there are other ways to buy something???I saw a magnet makers site a few months ago. Are you willing to buy online?
Thanks, I had already searched K&J, but I only found diamterical magnets of up to one inch in diameter. But I had not heard of apex before... and it seems like they have what I want... for a price, of course...There it is. First thing up on a google.
K&J Magnetics
http://www.kjmagnetics.com/?gclid=CI7_3sbKpsMCFUto7Aod7zwAmw
Then there is apexmagnets.com
I must disagree. One merely needs to have a situation where the postulated 'interactive' component of an electrically induced coil field (DC or AC) is not aligned with the rotor pole field. There would then be a torque tending to promote an alignment - transitory perhaps but discernable. A slow hand adjustment of the rotor over the full 360 degrees should disclose that proposed torque.As for reciprocity of action, my guess is that the coil would have to be energized with AC to imitate what the magnet will be doing when it spins...
Right... guess we're going to have to wait and see...I must disagree. One merely needs to have a situation where the postulated 'interactive' component of an electrically induced coil field (DC or AC) is not aligned with the rotor pole field. There would then be a torque tending to promote an alignment - transitory perhaps but discernable. A slow hand adjustment of the rotor over the full 360 degrees should disclose that proposed torque.
Thanks wayneh, but I couldn't find diametrical magnets larger than one inch in their websiteI've bought from these guys with success. I haven't checked whether they have what you need. Most folks want it polarized on axis.
I love a good experiment, but is there a goal behind this?
These are beginning to sound more like diabolical magnets.I couldn't find diametrical magnets
I hadn't thought of that... if my experiment succeeds I might need to call a priest to perform an exorcism, or something...These are beginning to sound more like diabolical magnets.
(Trying to do word play jokes across a language barrier. )
Some useful comments from MrAl.Hi,
The coupling between magnet and coil will have to be very good to see any good results and i think that will be hard to achieve.
Also, there's no core for the coil which means less effect than a motor or generator might have. So the effects of any kind (mechanical, thermal, electrical) will most likely all be quite small, so you will be looking for very small effects. I even have to wonder how much difference you'll see between a rotating magnet in free air and a rotating magnet inside the coil, probably very small, and you'll need a decent speed for the magnet.
Motors and generators have cores which help to increase the transfer of energy.
I think you can use a bar magnet, i dont see why not. Rotating any magnet at high speed though will require careful mounting and balancing.
Faraday's design was based on a flat solid plate of conductive metalDidn't Faraday do something like this? Called a 'homopolar generator'. But he rotated the disc not the magnet.
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