Re: [Emc-users] Quieting The Variable Frequency Drive (VFD) Noise. How To.

[Don S. <dst...@gm...>]

On Thu, Jul 29, 2010 at 1:17 AM, Jon Elson <el...@pi...> wrote:

Hi Jon;
My 3 phase experience is mostly practical with a basic knowledge of the
principles.  I think you are saying much more than I am getting in the
following statements. I will say what I think I am getting for each and
where there is more could you please elaborate?


> If the windings for each phase run parallel,

Three cores in a row sharing the ends. The coils are advertised as patented
bobbin windings.

that is a common-mode choke,
>
I understand common-mode in cabling and assume the same principal but
not sure of all this means.

    and there the main motor currents all cancel out,
This is a ?? for me.

so laminated cores should be fine.
>
My question is, "in what circumstance would it not work",
so I can avoid that in the future.

When I teach technical classes my first statement is
"the only stupid question is the one you never ask".
I know this is not a class but you have knowledge I am lacking.
Jon, I hope this is not a bother.

    Many Thanks
        Don (Details)


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