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inductor winding

Discussion in 'Electronic Design' started by Jamie Morken, Nov 4, 2008.

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  1. Jamie Morken

    Jamie Morken Guest


    I wound a test inductor using litz wire and a ferrite core, one layer of
    wire on the bobbin, now I realize there is still enough room for adding
    another layer of wire. I would like to keep the same number of turns,
    is it ok to wind the next layer on top of the first, in parallel with
    the first layer? The reason I ask is the second layer will have a wider
    loop of copper, and thus a longer path length of wire, so if I attach
    the ends of the first and second layer in parallel, the DC resistance of
    the outer layer will be higher, so I don't know if this will cause a
    lower Q in the inductor. The other option is wind two strands at once
    and then make a second layer with these, but that requires insulation
    between the first and second layers.

  2. MooseFET

    MooseFET Guest

    You are better off winding with two lengths of Litz placed side by
    side for the whole extent of the winding. If you do two layer some
    lines of force will try to sneak between them and induce a circulating
    current. The more leakage inductance, the worse the problem.
  3. Jamie Morken

    Jamie Morken Guest


    Side by side winding, that is one of the two wires always on the outside
    with a longer wire length than the parallel inner wire?

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