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A Transformer Sink???

Discussion in 'Electronic Basics' started by Randy Gross, Aug 29, 2003.

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  1. Randy Gross

    Randy Gross Guest

    I am probably wearing out my welcome with volley after volley of ceaseless
    questions. While on a path, and a new door opens, I have to pursue the
    adventure. I have one more question then I promise to give you men a break.

    It concerns the addition of heat sinks mounted to the transformer core.
    Something different I know. Question is: How much will this affect the
    inductance.

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


    | | | | | | The sinks are light Ga. aluminum
    | | | | | |
    | | | | | | bent into a U shape and then
    |__| |__| |__|
    ______ _______________________ ______ applied to a bed of
    || ||
    ______|| ||______ thermal compound. The
    | |
    ______ | | ______ entire assembly is then
    || ||
    ______|| Transformer ||______ strapped to the tranny
    | |
    ______ | | ______ with enough nylon straps
    || ||
    ______|| ||______ to hold them securely.
    |_______________________|

    I am not suggesting continuos duty, just slow down the temperature rise for
    a few more moments of operation between sprints.

    I look at your opinions seriously or I would not ask. Go or No Go is all I
    need.
     
  2. It won't. Aluminum is non-magetic. Even if the heatsink were magnetic,
    it wont effect the turns ratio.

    Kevin Aylward

    http://www.anasoft.co.uk
    SuperSpice, a very affordable Mixed-Mode
    Windows Simulator with Schematic Capture,
    Waveform Display, FFT's and Filter Design.
     
  3. Randy Gross

    Randy Gross Guest

    That is good news Mr. Aylward, there may be some hope yet for the lowly
    MOT.

    Randy Gross

    <p1C3b.14$>...
    : Randy Gross wrote:
    : > I am probably wearing out my welcome with volley after volley of
    : > ceaseless questions. While on a path, and a new door opens, I have to
    : > pursue the adventure. I have one more question then I promise to give
    : > you men a break.
    : >
    : > It concerns the addition of heat sinks mounted to the transformer
    : > core. Something different I know. Question is: How much will this
    : > affect the inductance.
    :
    : It won't. Aluminum is non-magetic. Even if the heatsink were magnetic,
    : it wont effect the turns ratio.
    :
    : Kevin Aylward
    :
    : http://www.anasoft.co.uk
    : SuperSpice, a very affordable Mixed-Mode
    : Windows Simulator with Schematic Capture,
    : Waveform Display, FFT's and Filter Design.
    :
    :
    :
     
  4. There is only two ways any external metal will have any negative
    impact on a transformer. One would be if it made good electrical
    contact with the laminations in more than one place, such that it
    allowed the laminations to form a shorted turn winding around the core
    flux, which would act as an additional load on the transformer. The
    other would be if the metal, itself, somehow surrounded the core flux,
    creating a shorted turn on the transformer. This is sometimes a
    problem with mounting hardware that passes through the center hole of
    a toroidal transformer.

    The fins you describe should do neither.
     
  5. Randy Gross

    Randy Gross Guest

    <>...

    <Snip>

    : There is only two ways any external metal will have any negative
    : impact on a transformer. One would be if it made good electrical
    : contact with the laminations in more than one place, such that it
    : allowed the laminations to form a shorted turn winding around the core
    : flux, which would act as an additional load on the transformer.

    This is the effect that concerned me the most. I read somewhere that the
    varnish used to stabilize transformers is formulated to sink heat to the
    outer surface of the unit. This is where the Idea came from to sink the
    tranny, assist the varnish to wick away the heat. Providing there's no
    adverse reaction from the thermal compound, the laminations should remain
    independent.

    Randy Gross

    :The other would be if the metal, itself, somehow surrounded the core flux,
    : creating a shorted turn on the transformer. This is sometimes a
    : problem with mounting hardware that passes through the center hole of
    : a toroidal transformer.
    :
    : The fins you describe should do neither.
    :
    : --
    : John Popelish
    :
     
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