A lotta motors are moving to variable drive to have a continuous duty cycle and do that by internally converting whatever is coming in into AC. They should happily accept DC since they're just rectifying the AC anyway.

My fridge is "inverter drive" and just runs continuously at a low duty cycle all day. Most heat pumps are like this too to dial up and down instead of strictly being on or off.

(Unsure what voltage the motors are running at though, so maybe AC-in is preferred to step it down before rectifying and chopping)