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Coil required

  1. Apr 18, 2013 #1
    Hi any one can help me to get these... i want bifilar wounded flat spiral and cylindrical coils for my project can any one tell where i can get them i required in quantity of two each
  2. jcsd
  3. Apr 18, 2013 #2
  4. Apr 18, 2013 #3
    Yeah i know about that information but i want details about manufacturers for it
  5. Apr 18, 2013 #4
    This kind of coil cancels induction, Is that what you want?
  6. Apr 18, 2013 #5
    Yes your correct... i want that type of coil but i want to know where i can get not the details about the coil
  7. Apr 19, 2013 #6
    Can you tell us your application?
  8. Apr 19, 2013 #7
    wireless power transfer
  9. Apr 19, 2013 #8
    That's what I thought. Do you know how much power you want to transfer and how far? There are some apps where you just power a mat that you can set the device to be charged on the mat where the distance is only a few cm. Then there is the kind that wants several hundred watts at 2 meters. Which app are you after?
  10. Apr 19, 2013 #9
    My application needs to transfer minimum of 5 volts and (200-300) mA range current that means i should be able to transfer atleast 1-2watt range at a distance of atleast 1 meter
  11. Apr 19, 2013 #10
    Ok, now what you need is to figure out the frequency of the coil. I would guess something around 1 mhz or so. You say 'at least' one meter, what about 'at most'?
  12. Apr 19, 2013 #11


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    A bifilar wound coil will produce no magnetic field. Why would you want that?
  13. Apr 19, 2013 #12
    does it cancel the negative effects of coil by making self inductance zero or it completely makes field zero..?
  14. Apr 20, 2013 #13
    The latter, inductance zero. That was why I was wondering what you were after.
  15. Apr 20, 2013 #14
    but i heard it reduces the drop across the inductor but increases the field generated around it. and also some people told compared to unifilar coils with bifilar coils they are getting more power in secondary coil
  16. Apr 20, 2013 #15


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    Are those two things different?

    Otoh, are you really wanting a multi strand inductor?

    There are applications for bifilar windings. For instance in Residual Current Circuit breakers an some component bridges.
  17. Apr 20, 2013 #16
    yes i need multi strand inductor..
  18. Apr 20, 2013 #17


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    Try Litz wire. It was very popular at one time in radio circuits.
  19. Jan 10, 2014 #18
    In-house bifilar twisted pair machine - diy


    I have begun building my own spool spinner for in-house manufacturing of twisted pair stainless fine enamel coated wire. I've added a description, more photos and videos to the link above. I hope to break this barrier and make twisted pair capability available to hobbyists like myself, also a retired NASA contractor. Thanks, Ron
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