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- To: femm@yahoogroups.com
- From: bhaskar bollapragada <bhaskar15656@yahoo.co.uk>
- Date: Sun, 29 Sep 2002 21:46:20 +0100 (BST)

    Hello,

    My name is BHASKAR. I am trying to realise the
    following in femm but facing problem. I wanted to
    realise a variable inductance motor which is actually
    a pretty good model for a stepper motor. When the iron
    piece is moved away from the gap, the cross sectional
    area of the core will decrease, there by decreasing
    the inductance.For a constant flux the internal energy
    will increase and a force will be exerted on the iron
    piece to attempt to restore it to its equilibrium
    position. The force F is given by

    F = m0 w N2 I2 / 2 lg

    Where m0 is the permeability of free space , w is the
    width of the air gap, N is the number of turns and I
    is the current and lg is the length of the air gap.

    For a force of 0.2 N, current of 1 amp, air gap of 2
    mm and width of 10mm we get the number of turns as
    252. I tried to realise this in femm but Iam getting a
    force very less than this in the x-direction where did
    I went wrong can any one give suggestions.I am sending
    the fem file attachment.Please send me your
    suggestions.

    BBHASKAR

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Attachment: `iron core new.FEM`
Description: iron core new.FEM

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