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Flux Paths in a Saturable Core Reactor

Discussion in 'Electronic Design' started by Randy Gross, Aug 25, 2003.

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  1. Randy Gross

    Randy Gross Guest

    Please view in a fixed-width font such as Courier.


    Legs:1 2 3 4 5
    ____________________________________________________________
    | ->__ -> <- ___ <- |<- ___ <- -> ___-> |
    | |___|_______________|___| |___|_____________|___| |
    | | | | | | |
    | | Coil wound | | Coil wound | |
    | ^| ----->>>> | | | <<<<----- | |
    | ||_______________________| |_____________________|| |
    | | | |___|___|___|___| | |v |
    | | | | | DC Control | | | |
    | | | v | Winding | ^ | | |
    | | | |_______________| | | | |
    |__|___|_______________|___|___|___|___|_____________|___| __|
    | <- <- -> Flux -> -> Path -> <- <- |
    |______________________________|_____________________________|


    All of the information I could gather on this subject, describes the
    configuration of this device as either a 3 leg core, 2 Tories, a U core or
    ELI. I could not locate any descriptions for the ELI core.

    Pictured above is a depiction of how I think the cores would be
    arranged(based on descriptions stating that the flux path is canceled in
    the leg containing the control winding to prevent induced voltage).

    NOTE: Please bear in mind that this is only a thought at this point. No
    components have been gathered or assembled.

    Am I on the right track here?
     
  2. Randy Gross () wrote:

    : All of the information I could gather on this subject, describes the
    : configuration of this device as either a 3 leg core, 2 Tories, a U core or
    ^^^^^^^^^^
    : Am I on the right track here?

    Almost.

    The way these things are usually constructed is with 3 legs. The
    reason is that the outer legs in your diagram are not really necessary
    for operation, and in fact, they actually detract from the effectiveness
    of the design because they leak flux further outside the saturated
    (center leg) region. Imagine what your device looks like and operates
    with the two outer legs removed. You could also use two toroids that
    are side by side.

    One minor warning is that the weight of the higher current devices can
    get kind of large.
     
  3. Randy Gross

    Randy Gross Guest

    You confirmed my concern about the first and fifth legs in the diagram. The
    extra paths would present a problem. I couldn't conceive of how the SCR was
    constructed with an EI core unless the unit was massive.

    Thanks Eric for the reply,

    Randy Gross

    <big74s$3r8$>...
    : Randy Gross () wrote:
    :
    : : All of the information I could gather on this subject, describes the
    : : configuration of this device as either a 3 leg core, 2 Tories, a U core
    or
    : ^^^^^^^^^^
    : : Am I on the right track here?
    :
    : Almost.
    :
    : The way these things are usually constructed is with 3 legs. The
    : reason is that the outer legs in your diagram are not really necessary
    : for operation, and in fact, they actually detract from the effectiveness
    : of the design because they leak flux further outside the saturated
    : (center leg) region. Imagine what your device looks like and operates
    : with the two outer legs removed. You could also use two toroids that
    : are side by side.
    :
    : One minor warning is that the weight of the higher current devices can
    : get kind of large.
    :
    :
    :
    :
    :
    :
    :
    :
    :
    :
    :
    :
    :
    :
    :
    :
    :
    :
    :
    :
    :
    :
    :
    :
     
  4. Hi Randy,
    Check this out.
    http://www.tpub.com/neets/book8/32n.htm

    enjoy
    harry
     
  5. Randy Gross

    Randy Gross Guest

    This is a great site for the SCR. It described the unit in detail as well
    as the Magnetic Amplifier. The three leg core and the torroidal cores are
    the norm for this design.

    Thanks Harry,

    Randy Gross


    <H_O2b.14623$>...
    !
    : >
    : Hi Randy,
    : Check this out.
    : http://www.tpub.com/neets/book8/32n.htm
    :
    : enjoy
    : harry
    :
    :
     
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