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# Re: [femm] Re: Incorrect force direction

- To: <femm@egroups.com>
- Subject: Re: [femm] Re: Incorrect force direction
- From: "Greg Watson" <gowatson@asiaonline.net.au>
- Date: Thu, 4 Jan 2001 16:47:58 +1030
- References: <9313qs+u5fs@eGroups.com>

    ----- Original Message -----
    From: "Rob " <rtickle@visi.com>
    To: <femm@egroups.com>
    Sent: Thursday, January 04, 2001 4:35 PM
    Subject: [femm] Re: Incorrect force direction

    > I tend to agree with this, that is what my intuition says also, which
    > is why this is an interesting problem. I think what the calculation
    > might be saying is that the difference in reluctance between the 2
    > sides becomes small enough to be down in the noise sooner than when
    > your intuition might lead you to believe... I'm tempted to build this
    > myself now and play around with it.

    Hi Rob,

    I wonder if part of the problem is not that David's FEMM assumes a 90 deg entry
    angle for flux regardless of the permeability of the rails and the distance out
    from the magnet. The right portion of the rails will be further up their B/H
    curve than the left portion but if you look at the flux distribution contours
    produced on the right & left sides of the magnet as the flux enters the rails
    there is no difference to my eye.

    FEMM seems to be producing a force to the left based on the same direction
    fluxes from the return between the rails & that going from magnet pole to pole.
    This would then produce a greater force to the left than to the right as
    simulated.

    Greg

- References:
  - Re: Incorrect force direction
    - From: "Rob " <rtickle@visi.com>

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