If you really need to have a phase converter, you need a digital one.
Obviously, there is not enough watts (area beneath the curve) to accel this mass in the given period of time.
Although there are tuning cards on the axis drives, you do not see any on the spindle drive. it is all done in parameters.
Also the Bridgeport installation sheets specify that you need balanced power.
There is a matching transformer on the bottom of the electrical cabinet but not for a rotary phase converter.
George
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)