Mostly Permanent Magnet Motor with minimal Input Power

[tinman]

OK-some one please explain to me as to why the magnetic field is opposite on the inside of the coil,as aposed to the outside of the coil,when all wire is wound in the same direction,and current flow is uniform.\

https://www.youtube.com/watch?v=IvfwELDmKIM

[shylo]

Thanks Luc, I've been testing with coils as well, I assumed that when you powered a coil that one side was n and the other s. If you lay your coil flat instead of on edge and put a magnet on it ,then power it depending on polarity the magnet will be repelled or attracted. How can this be ? One of the poles must be stronger to see this effect. I wasn't aware that both poles were present on the same side at the same time.
Very interesting Thanks
artv

[gotoluc]

Thanks for your post Shylo

I have no schooling, so I experiment to understand how things work. I found this about 7 years ago when I built a motor out of 2 MOT secondaries with a ceramic permanent magnet rotor. I still have that build if anyone wants to see it.

Ever since then I assumed it was common knowledge and would mention it here and there but now I'm finding out it's not common knowledge at all. I've just been told it's not in the textbooks.

If experimenters would like to test it, I would suggest a MOT secondary since it's more difficult to detect the poles with a round coil. You need a long strait side of a coil which separates the poles and makes it easily detectable. Also, best if the coil winding width and height are the same, so a square Brooks winding is best.

Please note as I have mentioned in my video that the center opening pole will be stronger because they are double together and in close proximity as opose to the outside poles away from each other but if you combine the two outside opposite poles (as I do in my MMM design) they are as strong as the inner pole.

So now you can double the torque of a coil if you understand this and know how to use it.

Luc

[i_ron]

OK-some one please explain to me as to why the magnetic field is opposite on the inside of the coil,as aposed to the outside of the coil,when all wire is wound in the same direction,and current flow is uniform.\

Hi tin man,


First, great work on the inertia drive! most interesting.


Luc does come up with some interesting things, right? Gyula and I were talking about this so did a quick and nasty vid for him...the polarity gets even more interesting with a gauss probe


http://youtu.be/GXkVpZYT76I


This is unlisted so refrain from passing it around please


The gauss meter is this one


http://www.coolmagnetman.com/magmetr1.htm


Ron

[gyulasun]

Hi Ron,

Many thanks for doing these tests. 

Would like to ponder on the resulting poles when an open soft iron core is used in or on the close outside of such oval shaped coil.  Cores collect and guide magnetic flux so I assume the unlike poles that are near to each other tend to close in the core surface so not likely to exit the open core. Obviously there will be a resultant flux, the result should come from all the flux collected and not closing in the core.  Surely there are plenty of flux remaining that would not close in the core to neutralize themselves but do work when current appears in the coil. 
For a normal cylinder shaped coil and core, the strongest flux manifests at the core ends of course.  If the cylinder coil is also a multiturn, multilayer type, then one has to think it over how the outside flux from the cylinder coil could be utilized for increasing the ends flux (if the goal is to maximize the force from such electromagnet).  Probably a similarly closed magnetic path with the inside and outside cores applied (as Luc showed in his earlier MMM force test videos) should also be used.

Thanks,
Gyula