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New spin on a old friend. 3Dss holllow core wind.

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  • New spin on a old friend. 3Dss holllow core wind.

    Ive been trying to play with different winds for the self shielding coil and I think this one is interesting.
    Please let me know what you guys think.
    The benefits as I see them are less wire alignment, more wire spacing between parallel layers, smother transition through what would have been slots on the regular form. The use of two forms in one so when you step back on your wind it is into another form so you end up with two wire thickness spacing between parallel wires this also makes for a cleaner transition betwen layers. tighter more varyable wire bundle size and the ability to make a 3d ss coil with tighter radius.
    oh yea and as the radius of the coil increases with the wire diameter it changes the wire alignment so nothing is really that parallel.
    So Here it is.
    this is the form before i went with two forms which just envolves centering up the tooth picks.
    Click image for larger version

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    This is a experimental wind using both forms at once you get 10 wraps before direction switch this could be ok and use the last 5 in the regular 3dss wrap to form the self shielding aspect.

    Click image for larger version

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    This is the final coil I still have allot of testing to do before I say its any improvement over the standard wind.
    right now it is 35 wraps # 30 litz 9 strand 450 uh 1.9 ohm resistance.
    It will end up down around 300uh before Im all done.
    Click image for larger version

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    Thanks Any input is appreciated.

  • #2
    this is not a coil.
    this is ART.
    I hope the test results will be as good as the way it looks.
    Congratulations

    Comment


    • #3
      Thanks for taking the time to show us your coil, that looks very nice, looking forward to hear about any results, well done.

      Comment


      • #4
        As Nicke_n said,,,'Art'! Hope it meets your expectations,,,I keep coming up with new ideas for my PI Coils too but none look half as good as that! Regards,,,Marty

        Comment


        • #5
          That looks to be very good coil, should perform well. I have my doubts about the effort required to make such intricate coil versus the benefits derived.
          It is not for me, what happens if you loose count for the transitions? That would be a nightmare!

          Comment


          • #6
            Originally posted by dbanner View Post
            That looks to be very good coil, should perform well. I have my doubts about the effort required to make such intricate coil versus the benefits derived.
            It is not for me, what happens if you loose count for the transitions? That would be a nightmare!
            Thank you all for the positive comments.
            Hi dbanner,
            Just like the standard 3dss. if you do not mess up your wrap you know when to transition when the wire lines up with the previous layer again you just jump back a slot and keep going. Also you can get back on track of your count if you loose it between layers .
            Thats and the form are the only differance between this wind and a standard 3dss wrap. Ill admit it is harder to keep track of the first layer. you have to count tooth picks 1,2,3,4,5,over the fifth tooth pick so its actually every 6 tooth picks.

            Comment


            • #7
              Having made several 3dss coils, I had big problems winding coil. Sometimes I would reach the transition point but the wire is on other side, so I know that I made mistake and had to go back.
              Finally, the ones I completed worked well but not spectacular, so I reverted to the flat spiral coil which performs the best for me.

              Comment


              • #8
                Well its back to the start.
                This was my first litz coil. Ive packaged kynar and other plastic insulated wires with spray foam and had no problem.
                I finally got the coil ready it was at 290 uh and 1.0 ohm resistance and I went to foam it to remove the toothpicks.
                Well i noticed on one of the lead wires where i got a tiny bit of foam it looked copperish, thought mayby beacuse its wet.
                Looked closer and wow the foam ate all the insulation of even the enamel from the litz.

                So if you have ever used foam on magnet wire it may not look too good under all that.
                Here is the coil after I wiped it off.

                Click image for larger version

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                Hard lesson to learn

                Comment


                • #9
                  That's a bummer godigit1,trully a work of art....You know now and won't make this mistake again.Try stabilise the windings with acrylic instant glue and soda...If I may ask the TC of this coil is 290us,if the tx pulse should be 3 times that is this a fast coil?Or are you going to use extra resistor in series?Keep going friend!

                  Comment


                  • #10
                    Double bummer

                    Comment


                    • #11
                      Sad to hear. I think KT315 was advising on wrapping it in insulation tape and leave the air gap. That remind me i can use non sticky teflon tape first. However if no foam inside, once you remove the tooth pics it might be disaster again.

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                      • #12
                        yup, a layer of paper rope and then scotch tape in 2-3 layers. the rope gives the air gap above. epoxy resin does not have to fill the winding.

                        Comment


                        • #13
                          Originally posted by mushaba View Post
                          That's a bummer godigit1,trully a work of art....You know now and won't make this mistake again.Try stabilise the windings with acrylic instant glue and soda...If I may ask the TC of this coil is 290us,if the tx pulse should be 3 times that is this a fast coil?Or are you going to use extra resistor in series?Keep going friend!
                          Thanks you all,

                          Hi Mashuba,
                          I think next time I will try to lock it together with a coat of water based polyacrylic, and put on a thin layer every 5 wraps.
                          This time I will do a material sample first like I should have done.
                          As far as a fast coil Yes That i what I was shooting for. Tc on this coil if im doing this right coil is 291 uh at 1 ohm. Resistance measured at ground of coil to R10 (R3) was 4.9 for a 178. I was going to play with the series resistance a bit. this was a learner.
                          If I take series resistance to 8.5 =102
                          10 =87
                          12=72.
                          I dont quite understand how all this works just yet.
                          Im goint to be running at higher pulse rates so even 72 us is a bit large.
                          Funny thing is i tested the coil this morning and it doesnt seem shorted out it still reads 295 uh and now 1.1 ohm.
                          Just for fun i will try it tonight see what happens.

                          Comment


                          • #14
                            Took a minute just threw it on its Toast. as expected.

                            Comment


                            • #15
                              If you are going to try again, perhaps you can immerse the whole thing in white glue for few minutes, allowing good penetration. Then remove and allow to dry, remove pins and give another good white glue bath.
                              Or maybe better to use sanding sealer, same immersion process, then allow to dry. it should be rigid enough to remove the pins.
                              you are certainly a man blessed with massive powers of concentration and patience. I would've headed for the closest watering hole after such a debacle .

                              Comment

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