Electronics > Projects, Designs, and Technical Stuff
Toroid Winder w/o cutting the wire.
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coppice:

--- Quote from: Cliff Matthews on May 23, 2019, 01:13:08 pm ---Pardon my nube-like ignorance, but why don't toroid mfg's make something like an intermediate product, split in half and supplied in matched pairs with some ferrous bonding slurry and catalyst? It would make shipping them a little easier too. Winding's could cover 350 degrees of the core perhaps with the aid of 4 plastic slip-on L-rings, but would that bring down efficiency too much to be a viable product?

--- End quote ---
Use a simple toroid winder and you can cover 360 degrees of a cheaper, simpler and more predictable core.
Psi:
Be careful when re-using those half toroids with the bobbin.
A lot of them have a small air gap in the center ferrite column and it's not very obvious when looking at them.
Ones with the air gap are intended for other uses and as far as i understand this makes them pretty much useless for power supply inductors?
Can anyone confirm this?
T3sl4co1l:
Gap is good for inductors (stores energy) and bad for transformers (transmits power) and CMCs (blocks transmission of power).

The latter two are really the same thing, used in two situations.  Transmission of power to ground is bad for transformers; transmission of noise in series is bad for CMCs.

Tim
HighVoltage:
I just came back yesterday from the Coil Winding trade show in Berlin and looked at the latest toroidal winding machines, because we need one for manufacturing in Germany.
 
https://www.coilwindingexpo.com/BERLIN

The toroidal winding machines have not changed much over the years, just got more precise and faster. I actually asked a few manufacturers if may be a new technology if on the horizon but all answered that this technology works well and will probably stay for a long time.

ali_asadzadeh:
Guys do we have good videos on how they works? I managed to find only the ones that are used for big torids! what about the smaller ones used in PC motherboard, they have the diameter of under 1.5cm
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