From the plate this seems to be a 2 speed motor, that is, wound as a 4 pole but the windings switchable to run as 2 pole at double the speed (i.e. 1400 & 2800 rpm). If the star point is accessible you could change it from star (380v) to delta (230v) running, though I think that's a bit trickier with a 2-speed motor. You could also run it from a lower voltage 230v inverter anyway, it will run at whatever speed is selected but just give a bit less power. Apparently if you actually reduce the speed to about 30Hz you can get the same power. Inverter Drive Supermarket sell drives, possibly 230v in 380v out ones, and they also have a note on their website about running at lower speed. Find them with Google.