Again Dr Ralph u don't use a needle bearing at all 😁 you use a full compliment deep groove radial bearing in SiC or Ceramic for the radial load . However pmdc motors with hollow rotor shafts filled with ferro fluid have shown higher efficiencies and torque production they also made for better generators but I guess from your previous post you've no use for those improvements.in shaft triplen suppression. Triplen that can kill a steel bearing before the radial load will.. BTW I didn't see any answers for you on the German social media...
Thanks for stopping by.
Hubert
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