Currently we do use buck/boost transformers, but I would like to get rid of them entirely. Hence my desire to be able to get 120V from both 240 split phase and 208 single phase.
Some of the other challenges are that at 50hz, the motors run hotter (even though they are rated for 50hz) and the solenoids run hotter also. Typically at 50hz, we
run the solenoids at 100V.
I've been looking into DC, but DC motors are less efficient, and for solenoids with DC coils the MOPD ratings are reduced. This may turn out to be the best option though.