Hi John L,
Well there are different types of control,
and of controllers.
If you just want to vary the speed that
might be easy enough.
If you want a controlled speed, that might
be more difficult.
I take it the 3HP 90volt DC motor has a commutator.
But what about the 7.5 HP 220 VAC Single Phase,
is this a Capacitor start?
Is it intended to run at a fixed speed? The 7.5 is a capacitor start and it is intended to run at a constant speed. The dc motor is a permanant magnet one. I would like a variable speed for both of them I also have a dc motor with seperate field winding. I would have to look at the field winding to see what it is. John L
John