Don Stanley wrote: > > 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. > Ferrite would rarely be cheaper than steel. If the windings for each phase run parallel, that is a common-mode choke, and there the main motor currents all cancel out, so laminated cores should be fine.
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