Time for a new Warpinverter build

Author	Message
Murphy's friend Guru Joined: 04/10/2019 Location: Australia Posts: 678	Posted: 10:41am 13 Mar 2021         Revlac said   The toroid all wound up has very little hole left in the center if any at all, Its more of a big solid hot lump, I have seen smaller ones bonded to a large heatsink, I really don,t think any of us are going to cook them, we would check it to see if we need any extra cooling, fans or oil cooling system quite common. The remaining hole size depends entirely by what kind of primary wire (cable?) you have used. For my single transformer inverters I used rectangular enameled copper wire and that left plenty of hole, even with the large double stack core that has a 6 x 15mm sq in parallel (90mm sq) primary. For the warpverter I used twisted (6 outer, one center strand) enameled copper wire which was the second hand wire unwound from the aerosharps. A great way to use up leftover wire. Roger, you are not the only one to discover the 3 in parallel, very hard to unwind, aerosharp toroids. Since you have a choice just join two same size cores for the double stack. A hint for that joining, make a PVC tube center that fits exactly into the hole to align both cores as you epoxy them together. You do *not* want any mis- alignment here. You also do not want the cores to come loose as you move them around while winding so epoxying is a *must* in my book.