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# Transformer ratios

- To: femm@yahoogroups.com
- Subject: Transformer ratios
- From: jim.bloor@smiths-aerospace.com
- Date: Fri, 12 Oct 2001 09:50:51 -0000
- User-agent: eGroups-EW/0.82

    Can anyone tell me whether it is possible to calculate the expected
    output voltages from a transformer with three windings. I can model
    two winding transformers OK and get reasonable results but my
    attempts with three windings are not so successful.

    The transformer has a primary and two secondaries. The stainless
    steel core material has a non-linear BH curve. Does this affect the
    calculation? Using the excellent note on 'Calculating Transformer
    Inductances with Femm' by Cornelius Paul, I've calculated the Self
    Inductance, Mutual Inductance and Leakage Inductance and eventually
    the 'k' value for each pair of coils in turn, ignoring the third
    coil. The inductance values are reasonable but the 'k' values do not
    match the practical values obtained by a considerable margin. What
    should I being doing with the third coil whilst calculating for the
    other two?

    Any help would be much appreciated.

    Jim Bloor

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