Electronics > Projects, Designs, and Technical Stuff
Noob plays with transformers
xavier60:
Cleaning the core laminations will increase eddy current losses, by how much, I don't know.
GeorgeOfTheJungle:
--- Quote from: BravoV on October 17, 2018, 05:25:34 am ---
--- Quote from: timh2870 on October 12, 2018, 03:41:37 pm ---Without doing any math, there's a pretty simple way to find out if you have enough turns on the primary; put a lightbulb in series with your coil. If it lights, then add more turns. Reactive power should cancel out, and all you're left with is the resistive losses of your primary winding and core losses in the iron.
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Add more turns until the bulb stops light up ? Elaborate further please.
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When the core enters saturation the primary turns into a short circuit. The core saturates beyond a certain ampere-turns figure which is proportional to 1/turns2 => to stay below that figure you just have got to keep adding turns.
station240:
--- Quote from: rebelrider.mike on October 17, 2018, 03:59:22 am ---The table of wire gauges, is that for copper or aluminum?
Well, cleaning the iron plates is progressing, but it's awfully tedious. I've got 97 Es to do, and 97 Is. I've gotten all but 30 of each done so far. It is pretty satisfying to see shiny rust-free plates though.
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Yes, the table is for copper.
Couple of links for you on what to re-apply to the E I pieces
https://forum.allaboutcircuits.com/threads/what-is-the-clear-plastic-coating-i-see-on-laminations-of-electrical-transformers.134030/
https://en.wikipedia.org/wiki/Electrical_steel
Ordinary varnish isn't an ideal option, but easy to get.
Perhaps you can find an electric motor rewinder for sourcing the special lamination paint, or cheap end of roll copper.
xavier60:
--- Quote from: rebelrider.mike on October 16, 2018, 02:25:35 am ---For my next transformer, I decided I want to build a 1:1 isolation transformer as a safety device while I work on various electrical projects. I found this guy at the local Habitat Store:
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How do you insulate the primary from the secondary windings and provide adequate creepage distance?
kkkwj:
Wow, what an interesting thread! Thank you for posting it!
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