the controler is in my milling machine but axiscontrols sell them here in the uk KB recon it would control my 90v motor
not sure what its getting powered buy but if you turn the max speed pot down to min you get 0-90vdc turn it to max you get 0-200vdc
not sure on the other two pots torque and cant remember what the othes called i know its some sort of compensator
i think torque is amps not sure on that though cant test what amps I`m getting

speedcontrolers hate me lol my sherline mill speedcontroler died now possably this one in my other mill all KB Controlers