Bruce L. Bergman wrote:
....
They usually set those limits because the test motor started to come
apart at 3600 but held long-term at 2750, and they left a cushion in
the max speed ratings.

I doubt it. 3600 rpm motors are usually max'ed at 5400 & it's unlikely
that 1750 motors are much differently constructed. I don't think that
I'd run a 1750 at 5400, but I would & do run 1750 at 3600 (on DP with VFD).

Bob