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winding your own toroidal transformer

Discussion in 'Electrical Engineering' started by gav, Sep 21, 2003.

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  1. gav

    gav Guest

    I've just finished a module of Transformer theory in trade school and was
    hoping to try some of it out.
    I plan on experimenting with winding my own toroidal power transformer.
    I require a 1:2 step up at 20V 150hz supply aiming at 150-300VA or so.

    I have found a general ballpark equation to calculate primary turns for an
    EI type transformer which goes like this:
    is N = (E · 10^8)/ (4.44·f·A·B),

    N= number of pri turns
    E= supply voltage
    f= frequency
    A= Cross sectional area of core (I think in square inches)
    B=max flux lines = rough figure of 60,000

    Using a toroidal core with a CSA of 1sq" it gives me 50 turns for the

    Is this equaiton correct?
    Is the value of B ok for say a Mains 300VA toroidal core off the shelf?
    If anyone can help me answer these two questions, or point me somewhere that
    can I would be very greatfull.

  2. gav

    gav Guest

    The name Arnold Magnetics springs to mind, but there are several other
    Thanks, plenty of usefull links there.
  3. DarkMatter

    DarkMatter Guest

    The core material selected should be on par with the intended
    operational parameters of the transformer in use.

    Powder may not be the optimal choice for the application in mind.

    Be sure to research your desired application, and select the core
    material which will operate best for you in that application.
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