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Thread: Stuff about VFDs and motors

  1. #1
    Supporting Member tonyfoale's Avatar
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    Stuff about VFDs and motors

    There has been interest in this topic recently, see http://www.homemadetools.net/forum/v...versions-73864

    The content of this current post is contained in a PDF located at VFD stuff

    Here are some pix as a trailer.

    Stuff about VFDs and motors-dv-dt_filter130.jpg Stuff about VFDs and motors-dv-dt_filter117.jpg click image for full size

    Stuff about VFDs and motors-dv-dt_filter110.jpg Stuff about VFDs and motors-rotorearth005.jpg

    Stuff about VFDs and motors-lc_filters.jpg

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    Altair (Jan 31, 2021), baja (Jul 17, 2019), jdurand (Jul 16, 2019), johncg (Sep 9, 2022), JTC (Jul 22, 2019), metric_taper (Jul 16, 2019), nashty1 (Jul 16, 2019), nova_robotics (Sep 9, 2022), Seedtick (Jul 16, 2019), Tule (Jul 22, 2019)

  3. #2
    Supporting Member DIYSwede's Avatar
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    -Good grief, Tony!
    A diy-ed 3P yoke LC filter! Excellent approach.
    Nice, straight-forward write-up very much appreciated at this receiving end!
    Did you mention the cap values - I was a bit eager in reading it...

    Is the transformer whine from inter-layer movement in the core laminations?
    You could perhaps dunk the whole shebang in varnish?

    Keep up the good work, and I'll be somewhat more patient in the future!

    Tip: For designing filters, there's a bunch of RF designs that could be applicable even at these freqs:
    Search "Butterworth LC filter design" or peek at this random find:
    https://rf-tools.com/lc-filter/

    ATB
    Johan

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    Last edited by DIYSwede; Jul 16, 2019 at 12:16 AM.

  4. #3
    Supporting Member tonyfoale's Avatar
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    Quote Originally Posted by DIYSwede View Post
    -Good grief, Tony!
    A diy-ed 3P yoke LC filter! Excellent approach.
    Nice, straight-forward write-up very much appreciated at this receiving end!
    Did you mention the cap values - I was a bit eager in reading it...
    You need to read a bit slower to get your answer.

    Quote Originally Posted by DIYSwede View Post
    Is the transformer whine from inter-layer movement in the core laminations?
    You could perhaps dunk the whole shebang in varnish?
    Johan.
    I did dunk the core in varnish and that had no noticeable effect so it is probably mostly magnetostriction and there is not a lot that I can do about that. It really is not a problem, once it was mounted in a box on the wall I could not hear it.



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