How would you know the voltage of a motor with no label?
The motor has three connections, which argues for it being an AC motor.
The capacitor (the square thing) is connected to one side of the supply wires and to the motor.  It is either a start or a run capacitor.
The voltage rating on the capacitor is 250VAC.  That could mean the motor is for 230VAC, or 120VAC.  The capacitor would be overrated if 120VAC, or just appropriately rated for 230VAC (although I'd expect the capacitor to be rated for higher voltage if the motor were meant for 230VAC.)

You could try it first on 120VAC.  If it runs well, done.  If it runs poorly, the capacitor may be bad, or the motor may be intended for 230VAC, or the motor may be bad.  Or, maybe I'm wrong and it is a 12VDC motor and it'll blow up if connected to 120VAC.
Are you ready to experiment, and maybe extinguish a fire if things go bad?
Maybe you'd rather &quot;find&quot; a new motor from a store somewhere that can sell you a known good motor with specifications and a wiring diagram.