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# Re: Incorrect force direction

- To: femm@egroups.com
- Subject: Re: Incorrect force direction
- From: "Rob " <rtickle@visi.com>
- Date: Thu, 04 Jan 2001 06:05:16 -0000
- In-reply-to: <002101c07611$47869da0$0319d7d2@ibmbn145hv>
- User-agent: eGroups-EW/0.82

    --- In femm@egroups.com, "Greg Watson" <gowatson@a...> wrote:
    > Hi Rob,
    >
    > I'll see what I can do over the weekend.
    >
    > One of the basics of my "seat of the pants" approach to estimating
    ferromagnetic
    > force direction is that a MMF source will be drawn toward a area of
    lower
    > magnetic reluctance.
    >
    > The area of the rails and volume of the air to the right of the
    magnet should
    > show lower magnetic reluctance than that to the left of the magnet
    due to the
    > larger amount of inward facing rail surface and larger air volume
    between the
    > parallel rails and thus the magnet should be drawn into a equal &
    balanced
    > magnetic reluctance neutral point in the horizontal centre of the
    parallel bars.

    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.

- Follow-Ups:
  - Re: [femm] Re: Incorrect force direction
    - From: "Greg Watson" <gowatson@asiaonline.net.au>
  - Re: [femm] Re: Incorrect force direction
    - From: David Meeker <dmeeker@foster-miller.com>

- References:
  - Re: [femm] Re: Incorrect force direction
    - From: "Greg Watson" <gowatson@asiaonline.net.au>

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