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RE: [FEMM] modeling coils???



Title: Message
Jeff,
You presently have positive current density on both halves of your copper coil, generating circular flux paths in you model.  Try placing an equal negative current density on one half of your coil (perhaps renaming it "-current").
Lee Marriott
 
-----Original Message-----
From: Jeff Peery [mailto:jeffpeery@xxxxxxxxx]
Sent: Friday, March 26, 2004 1:08 PM
To: femm@xxxxxxxxxxxxxxxxxxxxxx
Subject: [FEMM] modeling coils???

Hello, I am new to using FEMM and to electro magnetism - I'm a mechanical engineer fresh out of Univ. or Washington!  I have a new job and I'm jumping right into this stuff.  I'm looking at modeling the field that results from a magnetric flow meter.  I am pretty much following example 2 from the FEMM website; however the example shows a transverse slice of the inductor and I want to model a axial slice so I am confused about how to do this.  I attached my current FEMM file.
 
basicallly I have a simple inductor and I want to know what the mag lines look like.  I setup the geometry, meshed it, applied material properties, and a boundary condition and ran the solution.  the results don't look right. My confusion is that the flux lines should parrallel the inductor, but instead they radiate from the inductor ( in a circular fashion with the inductor at the center). so how does FEMM know how my coils are oriented? From the results it looks as thought FEMM thinks I have a transverse slice of my inductor, however what I want to model is an axial slice. 
 
Can anyone offer some advice? thanks!
 
Jeff