Magnetic Motion Device

[casman1969]

Hey DTB,

Got to thinking about how to insure there would be no wobble (if using 2 rotor head assembly or 1 for that matter) with a consistent, predictable track and thought that since you will be printing this stuff up anyway, why not put the rotor on a solid ring the same width and height as the rotor you have pictured. Granted, this would involve friction but for proof of concept a suitable luibricant could be used to reduce this problem and the track would then be true and precise. Maybe even a teflon coating to both rotor and stator ring and track? Splitting the stator assy down the center of the raceway would allow for easy insertion of the rotor ring and possibly even using a ridge on the Stator as opposed to having the entire track surface making contact with the rotor. I'm a big fan of ceramic bearings for next generation should this original concept work.
Right angle holes in the raceway could be used to pump air between the rotor ring and stator raceway so that the whole ring rides on a cushion of air thereby eliminating all friction in the proof of concept.
Sorry for rambling.

[casman1969]

BTW,

Was I off on the physical dimensions of the stator mags?

[b_rads]

Hi Brad,

When the rotor is first pushed in there is resistance the two poles between rotor and stator are in direct opposition. Once the rotor gets halfway through the first stator magnet it takes off. Another interesting effect is if I put the rotor magnet in the middle of the track and keep the rotor stationary it will push the stator backwards in the opposite direction. So it might be possible to hold the rotor fixed and have the stator rotate around. I attached a picture of where the gating occurs the rotor is shown right where it takes off. It seems like once it gets in that barbed pattern setup by the stator it is squeezed out.

Thank you for the reply and this information is very exciting.
I am thinking pendulum,  place your rotor on a swinging arm.  If the kick will let you get past top dead center, gravity should get you through the gate and continue the rotation.  I like the idea of removing friction from travel on the track.  The pieces you have already crafted should suffice to prove if this is possible or not.  Best of Luck.
Brad

[DreamThinkBuild]

Hi Newton,

I was wondering if a counter rotating system could be made, the rotors would have to be odd number to even stator to keep it unbalanced so it doesn't find equilibrium.

Hi Casman,

A solid rotor would good especially if it takes off. I can get about a 1mm spacing between the rotor and stator so they don't touch. I attached a picture of the idea of rotor ring. I don't want to get to far ahead yet my only goal right now is just get the rotor attached to a arm to shoot out of a curved(quarter of circle) stator smoothly. Then adding the next piece and seeing if it can make the next arc. Once I see that then it's open season on more elaborate design.

Was I off on the physical dimensions of the stator mags?

The only size I've seen mentioned in his document was the .875"L x .375"W x 1.75"H rectangle ceramic magnets. I'm working at a smaller scale about 1:3.5 but use the same size magnets for both stator and rotor. I did the spacings from looking at his drawings the top of the rotor magnet just passes the tip of the stator magnet on the top and slightly above the next stator magnet where the V of the rotor meets.

No problems rambling you bring up some good ideas. 

Hi Brad,

The pendulum idea would have one issue with it going back as the gating is strong if your pushing the rotor backwards through the stator. There seems to be a certain degree angle (3-4 degrees) that you can change the rotor in the track before it wants to lock or flip.

@All,

I'm still working on getting a proper curve I have to make sure the rotor magnet doesn't get above or below the angle of the next magnet in the stator. One idea to maybe remedy this is go with a slightly wider outside magnet but that may change the whole field pattern. I really want to see this move, but I have to avoid rushing or changing design from original, if we can get an accurate small model then we will know what angles we need to scale it up.

[Dusty]

I've built one similar to your wheel.  What I noticed is if you have all the outside stator magnets in place it wouldn't run. Without one section on the stator it would run from the start point to end point.   In other words place your rotor in the stator gap and it will go all the way around till it comes to the stator gap.  Then when I placed the last stator in place to complete the outside ring of magnets, nothing would move at all.


I figured out what it was.  When you place the rotor magnet in the missing stator slot you will get an immediate pull and it will continue right on around till it hits the wall at the end.
Now what happens when that last stator is installed the rotor doesn't know where start should be.  It will just sit there and not move.  There must be some continuous magnetic flux band completely circular to the whole stator ring.  The rotor just didn't know what to do.


I think I have a solution.  I never tried it but you will need to design a unit with lets say three levels.  Each level will contain a third of the stator magnets.  Of course you will need three rotors. Have your timing where when one rotor is just leaving the stator field the next wheel rotor will just be starting its entry point, and so on with the third wheel.


I hope you see what I mean.


Dusty