The 6 wires are for 3 coils. If the coils are wired as a star configureation that means it is 3phase and neutral at the center point of the star making it 415 volts ( Or whatever your supply standard is.) If the coils are wired as delta ( A triangle) no neutral is used and it then becomes 240 volts ( Or whatever your supply standard is.)
I will do a drawing for you if my words are not clear.
Changing between Star and delta wiring will change the speed and torque of the motor though.
Hope this helped.