Opposed Piston Motor

[solinear]

BTW, do you have a diagram of your controller circuit, with the parts you used?  I like your photointerrupter and need something similar for my design.  I could use a commutator, but would rather use something more like what you have set up there.

[tropes]

BTW, do you have a diagram of your controller circuit, with the parts you used?  I like your photointerrupter and need something similar for my design.  I could use a commutator, but would rather use something more like what you have set up there.

A simple circuit using a photointerrupter is found here: http://www.simplemotor.com/oimotor.htm
Tropes

[solinear]

You mentioned previously that the closer the magnets (pistons) got to each-other, the more voltage had to be applied to the coil to get it to push them apart again.

Is the relationship between pull force of the magnets (in lbs) or is it based on the flux density?

[tropes]

You mentioned previously that the closer the magnets (pistons) got to each-other, the more voltage had to be applied to the coil to get it to push them apart again.

Is the relationship between pull force of the magnets (in lbs) or is it based on the flux density?

Solinear
The distance between the magnets is a factor in determining both pull force and flux density.
When you say I "mentioned previously" please give reference to the posting so I am able to better answer your question.
I would like very much to see your design.

Tropes 

[solinear]

Also, the PM pistons should not contact the EM core but should have an air gap between. There is a great difference in the force required to separate the two.
Thanks again
Peter

I guess I was reading quickly when I did read it.  I'm not using a core with my design, so it's not really relevant for me.  Does the distance between the EM and the PMs (in your design) make a difference in the amount of power you have to spend to repel them?