On Wed, Jul 28, 2010 at 12:03 PM, Jon Elson <[email protected]> wrote:
> Don Stanley wrote:
> > Hi Stuart:
> > Yes, especially if wound on a laminated core like a 3 phase transformer.
> >
> Actually, because of the high PWM frequency of the VFD, standard
> laminated steel transformer cores are not ideal. Ferrite cores will do
> much better. I have a high-speed spindle motor that has too low
> inductance, so I used some Renco 1.6 mH "bobbin" style ferrite
> inductors. This wasn't strictly a noise issue, it was to keep the PWM
> pulses from saturating the motor's iron core. But, ferrite core
> inductors should work fine for the noise issue, too. Probably 100 uH
> with a current rating to match the motor would do well. 3 separate
> cores would be better than one common one.
>
> Jon
>
That is true, and the ferrite cores are faster and may be cheaper?
When I look at my KDR filter it looks like a 3 phase laminated
iron core transformer with only one winding per phase(no secondary).
I don't know what they were planning, unless they wanted additional
phase interaction for smoothing.
Hope this helps
Don
>
>
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