Time for a new Warpinverter build

Author	Message
rogerdw Guru Joined: 22/10/2019 Location: Australia Posts: 955	Posted: 02:12pm 14 Mar 2021         Murphy's friend said   Re rectangular wire source, I went to a motor winder to ask if they had leftovers. He mentioned that just down the road was a place that *made* this wire. They make only to order and the minimum was 20kg. But (having pity on me) they said they always make more than ordered and if I was not fussy about size they'll look if some leftover was around as it only got sold for scrap value. I said I'd happily pay a little more than the scrap value and so obtained my rectangular wire, I think it was about 10kg brand new wire I got for scrap price . Great find there. What a bargain. Surprising what is around once you start asking questions.   Quote   re your 20 strand twisted wire experiment, I tried something similar but fewer strands and quickly saw that holed disk idea was a waste of time if one wants a neat result. I know, somebody here did a many strand primary but it definitely was not neat. Do do it neat, wind 6 strands around a straight (kept straight) single strand and you end up with 7 stand wire. Do another two of these and then wind the 3 x7 into 1 x 21 wire. If you are happen to be in Perth WA you are welcome to have my 7 strand winding disk, spools & all but, of course, no wire on them I think if my disk was much bigger diameter or perhaps had handles to provide some leverage, I might have had a better result  ...  but I like your suggestion of winding some 7 strand wire and then combining 3 of those. I did watch some rope making videos but that would be hard to replicate with copper wire I reckon. Looks like it may be time to spend money on some larger insulated cable and be done with it. It's a bit hard to see from the photo but the loop of wire I'm holding is all that's left of the wire I loaded in my hoop after finishing two layers. It was a 50 metre length unwound from a 3kW tx and I was sweating as I got close to the end worrying that I might have to join a bit on to finish my layer. I have another 2 lengths at 52.5 metres and 57.5 metres. They should both do two layers each  ...  but do need to be longer as the diameter grows. This is the #2 Tx (I've completed the main winding on #3 and #4)  ...   ...  2 layers down with 5 to go. I'm using 1.7mm second hand wire instead of the new 1.8mm which I'm saving for #1 transformer.