Fwiw,While I never worked on a Baldor SmartMotor, Every VFD I worked on will operate fine on a singlephase input.
But, might need a jumper between L2 & L3 to prevent a ”low volt” faultcode. (this example occurs on Fanuc VFD, it just needs to ”see” a voltage on all three terminals, otherwise displays powerfault)
If one understands basics of how VFDs work, its easy to realise why.
Input power simply goes thru rectifiers & that powers a single highvoltage DC bus.
Small portion this DC gets regulated down to low voltage DC to provide power to operate its microprocessor & display, etc.
The processor drives the big output transistors what take the highvoltage DC & inverting that into the variable frequency 3Ø output.
If the price is right & needed it, I would buy that motor.
Chance is extremely good it will work on singlephase.