. NEMA 23 refers to the physical shape and size of the motor frame. Googling "NEMA 23" turned up this pic. If you can find a NEMA 23 motor with similar electrical characteristics, it should work. . If that's "-D10" at the end of the part number, check out these motors on Ebay.
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Looking at the maker's website finds no reference to themwww.japanservo.co.jp/digital/english/general/contents/contents_k.html It may be a mis-type, it might be obsolete. Steve