I think you need a phase converter that will match the HP of the motor you are converting.
23 amps on three phase.. thats a big motor! I'm guessing 10 to 15 HP?? what kind of machine is it?
Last machine I did, I used a static/electronic phase converter for a 2HP motor and it cost 400 bucks!!
In some cases its cheaper to change out the motor.
Good luck.