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# How to get the leakage inductance when very bad coupling.

- To: femm@yahoogroups.com
- Subject: How to get the leakage inductance when very bad coupling.
- From: "jire602000 <jire602000@yahoo.com>" <jire602000@yahoo.com>
- Date: Thu, 12 Dec 2002 18:17:31 -0000
- User-agent: eGroups-EW/0.82

    How to get the leakage inductance when very bad coupling.

    Hello every body !

    I want to calculate the leakage inductance of a bad power transformer
    with a bad coupling value (around 0.9 or less) . I also want to have a
    good idea of the eddy current losses
    I am working at 100khrz and using litz wire modeled with the µeff
    method (refer mails dated xxx xxx )
    Primary side 30 turns of litz wire fed with 10A / secondary side 30
    turns of litz wire./ EE ferrite core.
    I work on an axisymetric mode.

    I put in each primary wire the current of 10A with each wire its own
    current property p1 p2 p30.

    What must I do with the secondary to simulate the 30 turns in short
    circuit and have the leakage inductance ?
    · each primary wire the current of -10A with each wire its own
    current property s1 s2 s30. OK if the coupling value was 1 . I do
    not think this is fully right .
    · each secondary at µeff with in circuit =none . Not working if µeff
    is the material because it is like air .
    · each secondary at fully copper with in circuit =none . Working
    better . But each turn is considered to be a short circuit and not
    the 30 secondary turns together. Also the eddy current losses are far
    to much compare to a litz wire.
    · Put in circuit value voltage=0 for the 10 wires ? I don't known

    So , I need help and advise !

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