Using a motor to rotate a sphere from the inside 3

[tianshiz]

I'm planning to create a device inside a levitating globe like below:

this device would be able to rotate the globe through some force from the inside. I'm trying to think of the best method to construct a mechanism that can do this.

What makes this mechanical problem difficult is that I want someway of not only rotating the globe how I want, but to also keep it fixed once i find the right place. For now to keep things easier, assume the globe can only spin on one axis. In the future, it would be nice if the globe can tilt up and down.

There is a lot of physics involved and the only vague idea that I can come up with is to have a servo motor on the inside with a lever attached to the insides of the globe. So since its spinning only on one axis, the lever would be parallel to the ground.

Is this the most effective method however? Do you guys have any criticism or anything to add?

Thanks

 

[GregLocock]

Works for me

Cheers

Greg Locock


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[dvd]

could this somehow be done with cryogenics?

 

[moon161]

"could this somehow be done with cryogenics?"

If the globe is a superconductor, yes.

A sphere floating on a jet of air is a pretty stable situation, don't know if the noise would be tolerable.

As for rotation and control, put a magnet in the globe, perpendicular to the axis of rotation. Put a large magnet, in the base, and control the position of that magnet. If the field at the globe is stronger than the local field of the earth, you'll have control over the globe. You should be able to incline the axis of rotation if you incline the control magnet as well.

 

[tianshiz]

i wish I could just fake it, but that defeats the fun of it and creates other problems I'd rather not deal with.

Mintjulep,thanks for pointing out rc helicopters. This looks like a job for servo motors. Looks like there is gonna be 4 motors involved. I think for now I'm satisfied with this solution. Thanks for the help guys!

I'm gonna make a solidworks model of this some times later and see what you guys think of it.