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# Scaling question

- To: femm@yahoogroups.com
- Subject: Scaling question
- From: rtickle@visi.com
- Date: Fri, 16 Feb 2001 04:47:30 -0000
- User-agent: eGroups-EW/0.82

    Question for David and group:

    I've modelled a simple C core type electromagnet with two sets of
    coils in femm based on a design we are considering building. We are
    looking at building a quarter scale prototype first to make sure we
    can produce the fields the numerical solution tells us we can. I've
    noticed however, that in scaling down the original design by 1/4 and
    recalculating in femm, much smaller fields are produced in the
    airgap. Only by multiplying the original current density by 4 are the
    original fields of the full scale model produced along the centerline
    of the airgap. I had assumed that I would want to keep the current
    density fixed while scaling the model down; the numerics seem to be
    saying this is wrong. Can anyone explain why this is so?

- Follow-Ups:
  - Re: [femm] Scaling question
    - From: Renuka Rajput <renuka@cat.ernet.in>
  - Re: [femm] Scaling question
    - From: David Meeker <dmeeker@foster-miller.com>

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