Designing a Solenoid: Equations and Force Calculations

[ElectroPhysics]

I have to design a solenoid. It should be wound on some soft metal of certain permeability. It should have hollow inner dia that will be used to operate a gas valve. The problem is which equations should I use to design the solenoid. I also have to calculate the force that will be required for its operation. If someone knows the web address that have all these informations or some application notes is most welcome.

 

[pallidin]

Here's a couple of sites that might be useful. The second one is pretty good.

http://www.ledex.com/basics/basics.html

http://www.cliftronics.com/design_guide.html