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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: Mon, 25 Nov 2002 11:17:40 +0100
- References: <5.1.0.14.0.20021125084659.00ac64e0@staff-mailin.lboro.ac.uk>

    Keith Gregory wrote:
    >
    > Fabio,
    >
    > Just a suggestion but if you are setting the primary current to 10A
    > (equivalent to 45.45 mA) and you have a turns ratio of 220/117 then try
    > setting the secondary current to 10x220/117 =18.8A (equivalent to 160.7mA)
    > and see what happens.
    >
    > In addition, I am not clear as to why you would want an air-gap. In a
    > voltage transformer it would just increase the losses.
    >
    > Keith.

    Keith,
    thanks for your suggestion.
    I added a small gap just to be sure that the effect of core nonlinearity
    was negligible.
    I think that the problem is not in secondary current because i changed
    it without difference in result.
    And when i evaluate mutual inductance i set I1=10 and I2=0.
    Probably i make an error evaluating M , Ls1 and Ls2 are ok.

- References:
  - Re: [femm] Inductances in electrical transformers
    - From: Keith Gregory <k.gregory@lboro.ac.uk>

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