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stepper motor nomenclature

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  • stepper motor nomenclature

    Does anyone know what a good site would be that describes stepper motor numbering scheme?

    EG, a 28BYG501 - 28mm square over flanges on the end, but the rest of the numbers/letters?

    Just looking for a good reference - thank you.

    Another JohnS.

  • #2
    ?? Part numbers are at the whim of the OEM? There is no 'Standard' numbering scheme, at least as far as I have come across?
    Add to the mix, the various countries of manuf, and you have anyone's guess?


    • #3
      If you haven't seen already and need for that Chinese manuf:


      • #4
        Well NEMA publishes a really nice reference NEMA ICS 16-2001 and its free to download if you make an account although a bit of google work will find copies all over the internet for free download without making accounts and such.

        Its a couple hundred pages of light reading that can answer any possible question about stepper standards including your nameplate question. The short version is you can get some idea of what a full NEMA name means in about one page at:

        Or just by googling around. 28mm between holes is weird, sure you don't mean 26mm because that would be a standard NEMA size 17 motor mount distance between holes. All the letters and stuff afterwards are supposed to mean something about flange design (type "B" donno?) and insulation resistance and waterproofing and wiring type (like, unipolar or bipolar?).

        Frankly I mostly ignore the NEMA standard because its a pain and use the (free) datasheets from the motor manufacturer. The standard tells how to spec something, but the manufacturer specs whats actually available.

        Its kind of like "the official morse taper standard for #3 taper" specification in the handbook vs reading about some manufacturers part number 12345 which happens to be morse #3 with lots of extra detail about that specific part number, like maybe what the other end is tapped for or whatever which isn't in the standard anyway.


        • #5
          Another misconception is that NEMA sizing also indicates torque value, whereas there is a wide range that can fall into one NEMA size.
          This applies to servo's as well as steppers.