Oil-free vertical vacuum pump why a little negative pressure inverter on the torque limit

Oil-free vertical vacuum pump why a little negative pressure inverter on the torque limit

and then use the inverter into three-phase AC, 380 volts almost, Can only use the transformer rose to 380 volts.

Here is not the inverter can solve the problem, you should first 220V single-phase AC rectifier for the DC (full-wave rectifier plus filter about 310 volts),

Or the star of the three-phase motor to the corner, so that after the rectifier inverter into a 220-volt three-phase AC ...