Re: Toroid transformers

--- In CAD_CAM_EDM_DRO@egroups.com, "Greg Nuspel" <nuspel@t...> wrote:

> I was wondering if anyone has experience with using Toroid

transformers for

> their power supply?
>
>
> -- Greg Nuspel
>
> "Imagination is more important than knowledge."
> --Albert Einstein
>
> Clubs Page http://www.cadvision.com/crcss

I echo what the rest of the group has to say about the use of
Toroids. Without all those laminations banging together at 60HZ a
toroid runs quieter and with less heat. The magnetic field is
concentrated into the toroid and not into the tiny airgaps between
laminations so the radiated EMI (noise) is much less.

They are, on the other hand, a real bear to wind. If you can find a
transformer already built on the surplus market (I have seen them
from time to time) it would make a good power supply. Will it make a
difference in a CNC application? Probably not since the source of
noise is all the switching frequencies and the voltage spikes and
reverse voltage from the steppers or servos. Most control circuits
have pretty good filtering for low frequency stuff (<120hz)...
especially sine waves. On the other hand that nasty square wave
20Khz that modern drive circuits use has harmonics that go way up
into the radio spectrum!

If you enjoy cross stitch and have LOTS of patience then winding your
own toroid might be just the thing for those long winter nights :-)