DC Shunt Electric Motor Max Speed Question.

Well thru the last 45 years working on mostly GE AC and DC variable speed drive systems I would not be too concerned wint 2 to 1 speed range, my concern is the field current is already in the dirt.
Armature is most likely glass banded and at that small diameter commutator is not going to be an issue
Edgar

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sorry i missed the Permant Magnet yes voltage control

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