Kollmorgen designs and manufactures DC adjustable speed drives for PM and wound-field DC motors from 1/4HP to 2HP. The drives feature a NEMA 4 enclosure and are available as reversing, torque control, and signal follower models. The company also produces DC stepper drives including its' 6400 series, which feature input voltages from 25 to 75 VDC, and output current that is selectable from 0.625 to 7.1 amps - for motors up to size 42.