(This is in response to post
#19)
Yes, your original circuit is completely wrong.
Notice how one coil (from the outside to the inside goes clockwise, and the other one goes anticlockwise.
Your best bet is to have one coil going from the outside to the inside on one side of the board, raking the ends (outside and inside) and applying power to them.
If you have double sided board, then you can place one coil on each side, and connect the centers together (through a hole in the board).
If you look at the way the current needs to flow, it will go round and round and round as it goes from one edge to the middle, then cross over and go round and round as it makes its way back to the edge. The thing is, the coils will be mirror images of each other. the current needs to be going around an imaginary axis through your board in the same direction. If it goes one way then the other, the effects cancel out.
In your diagram above, both coils go anticlockwise, but the current in one is the opposite direction to the other, So the current starts out going anticlockwise as it moves to the center, then goes clockwise on the way back out.
