[QUOTE=EddyCurrent;52560]I don't know exactly which motor you have but can you change the connections from star to delta ? it won't change the number of poles obviously but it would give a lot more torque. .[/Q

Changing star to delta connections will change the operating voltage and ~ double the amps required, doesn't change the torque curve of the motor.

More torque will require even more amps, which I haven't got, or more poles. This is in my garage on a 240v supply with my existing 3Kw VFD which is why I am looking at changing pole count.