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# B.n(avg) vs. B.n^2(avg)

- To: "Femm@Yahoogroups. Com" <femm@yahoogroups.com>
- Subject: B.n(avg) vs. B.n^2(avg)
- From: "Jay D. Greener" <jdgreener@earthlink.net>
- Date: Mon, 14 May 2001 14:08:30 -0600
- Importance: Normal

Hey Group, I’m having some trouble getting valid force numbers for my axisymmetric pot core solenoid model. I’m not able to define a contour in the very tight air-gaps surrounding the armature. I’ve opted to estimate force using F=(A*B^2)/(2*mu) Where A = Armature Area, B=Average Flux Density along Armature Face, mu = permeability of air. My question: Because (B.n.average)^2 doesn’t equal (B.n^2)average. Which should I use? Why? Is this method going to yield accurate results? Also: is there anywayto show an H density plot around the circuit? I can define a contour around the magnetic circuit then plot H, but this doesn’t give me a feel for the ‘high MMF drop’ regions as well as an H-density plot would. Any suggestions? Thanks, Jay D. Greener

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