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# [femm] holding force

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- Subject: [femm] holding force
- From: "Gabriele Bellussi" <bellussi@libero.it>
- Date: Thu, 4 Nov 1999 20:04:00 +0100
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I have a problem. I need to determine an electromagnetholding force but I don't know wether using Maxwell stress tensor or not. The electromagnet I'm studing has a mobile part attracted by the fixed part, at the end of its stroke the moving part touches the fixed one: if I use the stress tensor to determine the attractive force, I must define an integration path that crosses both the ferromagnetic core of the moving part and the air around it perhaps causing a spurius answer to be determined. A possible solution could be studing the attractive force produced when the mobile part is very close to the fixed part without touching it, but I wonder if it is possible studing the real case. Thank you in advance. Gabriele Bellussi.

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