Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Coil design and winding area?

  1. Apr 22, 2013 #1
    I have been reading about coil design and I have a question.

    Is there any specific reason a coil design should utilize the entire winding area?

    I keep reading about this in different literature but none of the literate i have read explains why.
     
  2. jcsd
  3. Apr 22, 2013 #2

    berkeman

    User Avatar

    Staff: Mentor

    Can you provide a link or two where this is discussed? What kind of magnetics are you talking about here -- inductors or transformers?

    There are winding techniques for transformers that help to minimize the leakage inductance Lk, and other techniques to minimize the parasitic winding-to-winding capacitance Cww. Those techniques may be related to what you are referring to...
     
  4. Apr 22, 2013 #3
    Yeah, I'm talking about wideband transformers.

    I was thinking it had to do with leakage inductance but I'm not sure.
     
  5. Apr 22, 2013 #4

    berkeman

    User Avatar

    Staff: Mentor

    Can you provide a link to the statement, or else type the exact statement here? A diagram would also help.
     
  6. Apr 22, 2013 #5
    Ok, I know I read it somewhere. I've got so many papers saved on my computer I can't seem to find it.

    Can anyone here tell me why one should fill all the avialable winding space in a coil?
    Are there negative effects to not utilizing all the space???
    I tend to think it's just suggested so that the coil design cost is minimized by not using too large a core?
     
  7. Apr 22, 2013 #6

    berkeman

    User Avatar

    Staff: Mentor

    Well I mosty wanted to see the context of the statement -- there are a number of tradeoffs in wideband transformer design.

    Certainly cost is a big deal, and maximizing the winding area useage can be a part of minimizing the cost. However, if you make the core cross-sectional area too small, and fill up the bobbin with windings, you risk running into core saturation issues.

    So you look at the different size cores available, and the permeability numbers, and the sizes of bobbins that are compatible with the core. The size of the wire you choose depends on the bobbin area and the currents that will flow in the windings. Once you have an initial estimate on the number of turns based on the core and bobbin, you do the calcs to see if you are close to saturating the core or not.

    The winding configuration is usually aimed at attaining the required magnetizing inductance Lm while minimizing the leakage inductance Lk and keeping the Cww low. If you have any more specific questions about transformer design, we can address them here. :smile:
     
  8. Apr 22, 2013 #7

    vk6kro

    User Avatar
    Science Advisor

    For a given number of turns, you can use a larger diameter wire if you fill up the winding windows than if you don't fill it.

    So, this reduces the resistance of the winding and hence the losses.

    From a mechanical view, filling the window prevents the wire moving in the window. This reduces hum and possible damage to the winding.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Coil design and winding area?
  1. Toroidal coil winding (Replies: 63)

  2. Coil design (Replies: 1)

  3. Wind turbine design (Replies: 3)

  4. Coil Design software? (Replies: 11)

Loading...