Wanted: Source for 8-10Kw toroid cores.

Author	Message
wiseguy Guru Joined: 21/06/2018 Location: Australia Posts: 1251	Posted: 11:03am 28 Oct 2023       Hi Roger, yes back now and nearly finished my current to do jobs list - that was not created by me..... So time to dust the cobwebs off a few projects and the soldering iron and have some more fun. With regard to the transformer primary turns, lets look at scenario 1, forgetting secondaries and just looking at the magnetising winding force.  We apply excitation and have magnetising of the one toroid of 1 tesla.  Now lets stack 2 transformers with the same number of primary turns and I am sure you will agree that the two Toroids now share the megnetising force equally and we end up with 0.5 Tesla each.  If we now halve the primary turns they will now be back to 1 tesla each. We doubled the iron mass cross section so we need to double the ampere turns, which from a given excitation means we must halve the turns. So if 1 tesla on 1 toroid originally gave me 230V then both of the stacked transformers with wound 230V secondaries will each be back to 230V and can be put in parallel.   I will wind my own Toroid - but with a caveat, only if I cant achieve what I want from existing pre-wound transformers and then applying some lateral thinking to hopefully find a solution that allows me to avoid a rewind! So hope you're having fun & have kept up your Altium skills.