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Transformer operation question

Discussion in 'Electrical Engineering' started by jriegle, Oct 30, 2003.

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  1. jriegle

    jriegle Guest

    I have another question for the group. Take any transformer, in this case,
    I'll use a torus shaped core; one with the primary spiraling around the core
    all the way (360 deg.). As I understand, the torus design is efficient and
    there is low flux leakage from the core. If this is the case, how is the
    magnetic flux cutting through the secondary (and the primary) to produce
    current? It seems that flux only has to pass through the inner area of the
    coiled wire to generate current without actually cutting across the wire
    itself yet transformers are obviously efficient devices. Does this have to
    do with flux actually collapsing and expanding out of and into the core due
    to the AC? The problem I see with the toroid design, the flux is always kept
    in the core because the windings are looped back on itself due to the torus

    Thanks, John
  2. Don Kelly

    Don Kelly Guest

    Actually, this is not a problem -just a bit messy. In general for rotating
    machines, as an example, there will be both transformer and speed voltage
    terms. Think in terms of d(Li)/dt rather than Ldi/dt (or go deeper, through
    Maxwell) That is the effects of varying flux and changing position can
    readily be handled. There are many energy conversion texts, and all those at
    graduate levels, which do this. . Maxwell's equations rule and can be used
    to lead to the same results assuming a quasi-static situation which is valid
    in most cases, particularly considering the approximations needed to allow
    solution within a lifetime.
  3. jriegle

    jriegle Guest

    Thanks for the comments. It sounds intriguing that a current can be produced
    in a coil of wire that contains a magnetic flux even though the coil does
    not have to be in the flux, just surrounding it!
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