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electromagnet winding

Discussion in 'Electronic Basics' started by lerameur, Jun 26, 2007.

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  1. lerameur

    lerameur Guest

    hello

    I am winding an electromagnet with some 29awg magnetic wire. I want
    to make to electromagnet with the same strength, but one core is about
    3 time as big as the first. With the small core I get 185 Amp-turn
    with 480 turn (31ohm).
    The second core (bigger one) has a calculated 221.2 amp-turn with 700
    turns and 38 ohm. because there is 3 times the metal I divided that by
    3 so I get a 79 Amp-turn electromagnet with respect to the first
    electromagnet.
    How do I make the big core magnet the same strength as the smaller
    one ?
    If I use more turn, oddly enough I get even less amp-turn.
    Without changing the wire gauge, is there a way to get the same
    magnetic strength ( approximately 660 amp-turn ) with the big
    electromagnet ?

    thanks

    Ken
     
  2. Run windings in parallel, in this way you reduce the resistance of just
    having one long winding. You can easily double or triple the amp-turns by
    doing this.(of course now you might end up having to deal with heating
    issues)
     
  3. Eeyore

    Eeyore Guest

    The field strength depends on more than just the core area. You need to factor
    in the permeability of the material, the core magnetic path length and and take
    account of the influence of any air gaps too.

    Graham
     
  4. lerameur

    lerameur Guest

    Indeed, but I just a rough estimate here. I just came up with two
    problems. I hand sawed the excess of waffer stack. Somebody told me
    that this will create a short circuit. but guess what, I did not see
    anything between the waffers and this stuff is non conductive, so it
    should mind no ???
    Also I was suprised by some calculation i did on an excel file. I get
    the same amp-turn no matter how many turn I make. The only difference
    is the resistance. Is this right ??
    You can get the file here:
    http://www3.sympatico.ca/lerameur/motor_core_calculation.xls

    ken
     
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