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# Re: [femm] Inductances in electrical transformers

- To: <femm@yahoogroups.com>
- Subject: Re: [femm] Inductances in electrical transformers
- From: "Fabio" <fmilanesi@tin.it>
- Date: Thu, 28 Nov 2002 00:08:25 +0100
- References: <002a01c29401$f71ac4c0$db272dd5@tin.it> <3DE44FB7.3060203@ieee.org>

    ----- Original Message -----
    From: "David Meeker" <dmeeker@ieee.org>
    To: <femm@yahoogroups.com>
    Sent: Wednesday, November 27, 2002 5:53 AM
    Subject: Re: [femm] Inductances in electrical transformers
    > >
    > You're using the wrong area for a2--this is probably ambiguous the way
    > that I've written it up in the manual. This area is meant to be the
    > cross-section of the coil such that the current density in bulk coil 2
    > is: J2 = n2*i2/a2. Looking at your geometry, the a2 area should be 9
    > mm * 61 mm, or 549 mm^2. You've used twice that area, so you calculated
    > exactly half the coupling factor that you should be getting.
    >
    > Dave.
    >
    >
    Thanks Dave,
    now i get good results.
    Best regards
    Fabio

- References:
  - Inductances in electrical transformers
    - From: "Fabius" <xfabius@email.it>
  - Re: [femm] Inductances in electrical transformers
    - From: David Meeker <dmeeker@ieee.org>

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