[FEMM] How do I model a multiple turn copper wire coil?

[Mike Middleton <mike@xxxxxxxxxxxxxxx>]

I'm a real new user to FEA and magnetic modeling.  I DO have a lot of 
experience in designing and winding transformers, via a hand calculator, 
pencil, and paper.  Most of my work has been in RF and switching power 
supplies.

I have done Examples 1 and 2 of the FEMM Tutorial and have an idea of 
what's going on.

I've been asked to re-design/analyze a magnetic sensor.  This sensor is 
basically a steel cup about 1" diameter by 1" height.  The center post is 
an Alnico 8 magnet about 0.375" diameter.  A few hundred turn copper wire 
coil is wound around the magnet.

Of concern, is the electrical output we get from the coil as a piece of 
steel is passed across the open end of the sensor.  I think I can figure 
out how to model the steel cup and magnet in FEMM.

How do I model/enter the multiple turn wire coil?  Modeling it turn-by turn 
will take a LONG time.

Thanks,



  Mike Middleton, engineer,  Wirebenders
Custom Transformers and Similar Devices
          10201 N. 21st Avenue, Suite 4
    Phoenix Arizona, USA, 85021-1827
 voice (602) 861-1856, fax (602) 870-9242
          e-mail coils@xxxxxxxxxxxxxxx
         Website www.wirebenders.com