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# [FEMM] Radial force in axymmetric problem

- To: "Finite Element Method Magnetics mailing list" <femm@list.foster-miller.net>
- Subject: [FEMM] Radial force in axymmetric problem
- From: "Fabio" <fmilanesi@tin.it>
- Date: Sun, 22 Feb 2004 21:44:38 +0100
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    Hi, everyone.

    I have used FEMM to simulate an air inductor for used to reduce short
    circuit current.
    I try calculate the force between turns using Lorentz force, force via
    weighted stress tensor  an force via stress tensor ( contour ).
    I get good results for z component of this force. Obviously the total r
    force on one turn is zero for the axial symmetry but if a consider a small
    part of turn there is a local radial force.
    I try to calculate this force using the virtual work principle : F = dE/dr =
    1/2* i^2* dL/dr.
    First i calculate the inductance L0 of the circuit , then i give a small
    displacement dr  to all turns on the external layer and i calculate again
    the inductance L1.
    Then i calculate the force F =  1/2* i^2*(L1-L0)/dr and divide for the
    number of turns and for the length of one turn to get the force per unit of
    lenght.
    Now the question :
    is there a faster way in order to  calculate radial force in postprocessor ?

    Thanks and best regards
    Fabio

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