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# End turns and end ring leakage inductances in machines ?

- To: femm@yahoogroups.com
- Subject: End turns and end ring leakage inductances in machines ?
- From: "marsupiofr" <marsupio@hotmail.com>
- Date: Tue, 10 Sep 2002 11:56:29 -0000
- User-agent: eGroups-EW/0.82

    Dear sirs,

    I'm currently dealing with end turns and end ring leakage inductances
    in squirrel cage induction machines. I found in books several
    analytical formulae but they are often esoteric and quite different
    from a reference to another reference. Does somebody have
    comprehensive analytical formulae concerning these extremity effects
    in machines (especially end-ring leakage inductance). By the way, I
    tried a small simulation (endring.fem in Files section) in FEMM :
    this is an axisymetric problem where I modelize a square end-ring
    carrying 1A (you can see the stator frame and rotor frame also). I
    want to calculate the inductance of this end-ring and I use integral
    A.j and I find 2.68e-7H. Do I make a mistake because I'm not familiar
    with axisymetric problem. There is certainly a problem also with the
    boundaries.

    So, could you have a look at this simulation ? Thxs in advance.

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