Mostly Permanent Magnet Motor with minimal Input Power

[gotoluc]

Thanks Ron for making this clean test and video

Luc

[Farmhand]

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

I think coil gun makers are aware of these things, I think I read that some use magnetic shields to increase performance.
http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=6325058&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D6325058

Quote of page here.

The shield material properties and its structure are important to the coilgun's performance. In present article, a two-dimensional (2-D) transient finite element model was established based on the structural characteristics of the coilgun and launching process. Effects of variable shield materials with different dimensions on the launching performance have been investigated. The magnetic field distributions at different times have been presented. The results show that, the eddy currents induced in the conductive shield will reduce the projectile's muzzle velocity, and the electromagnetic shielding effect of the conductor is not ideal. Strengthening the main magnetic flux, permeable non-conductive material shield increases the muzzle velocity of the projectile, and the electromagnetic shielding effect is good. Increasing the thickness of the shield, the magnetic materials enhance the magnetic flux better, projectile muzzle velocity increases, and the electromagnetic shielding effects are better. In order to achieve higher projectile muzzle velocity and better electromagnetic shielding effects, high permeability silicon steel sheets can be used as the shield. The distance between coils and shield should be reduced. The thickness of silicon steel sheets should be as small as possible to reduce eddy current effects.

Might be of some interest. 

I made a very rough accelerator for fun but the stored energy required for spectacular effects could be dangerous.

I know it's a bit different to the device in this thread but I think the shielding is like an external core is all.

..

[teslaedison]

here are my two cents into what you have also because magnets many of them can help make a repel cushioning affects on both sides of the center magnets that rotate that are also connected to those two center magnets with a disk circular disk and at the outside would have many magnets also that will rotate and possibly go at light speeds b/c the outside magnets would on both sides but inside enough to helps repels them with no metal to metal frictions as a North to North cushioning for both sides too so enjoy what my two cents might come out to show you all here too !!!
Thomas C.

[Khwartz]

because the "sense" of direction of rotation inside the coil is, lets just say, up and on the outside it is down and it is the "sense" of direction of rotation that is polarity.

Hi! webby1. Thanks for your input but I am not sure to get the concept  (which directions and sens you speak). Could you please join drawing with arrows?

[Khwartz]

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

Thumb! Ron. Thanks for having taken time to do this experiment and sharing it to us