I'm building a supply for a 90 VDC 1/2hp motor.
So far I am using a garage sale variac (until I can find a regular 120/90VAC step-down transformer) and a bridge rectifier.
It runs the motor just fine, but I'd rather be kind to the motor and take out as much ripple as reasonable. The motor may pull as much as 5 amps (max) but the load probably just won't be too much. I was hoping someone could just say "get this and it will work fine." The motor will just be turning an observatory dome, so there might be a bit of a pull to start it but then probably not a lot of load.
Mostly it's going to be a full on and off situation. A control board and relays will turn on the power to the motor. Then if it needs to go the other way the other relay will turn on the reverse power. Mostly it's job (after homing) will be to move the dome incrementally to keep the opening in front of the telescope. So on/off 90vdc.