Can 220V use frequency converter to drive three-phase motor with 380V?
If it is a small power motor can be connected into angular motor then a three-phase inverter output 220 single-phase input 220 will be able to connect, as mentioned above can boost its output voltage frequency is equal to the maximum input voltage, so the 380 can not directly connected with the motor, but if you meet the above conditions can be considered,
If it is a star connection instead of a three phase 220V AC input, will the efficiency of the motor be reduced? Can you achieve the efficiency of the original motor 380V?
Can not. The inverter is not step-up, single-phase 220V AC frequency converter into it is three-phase 220V AC motor is connected if your star angle connection can be changed, if the corner there's no way, after the motor power will be reduced about 4/10.
The use of motor, if the star is connected to the corner of the connection can be, and if it is angle, then there is no way, and then the power of the motor will be reduced by about 4/10.
Can not. The inverter (frequency transformer) is the use of power semiconductor devices will be the role of on-off frequency to another frequency power conversion power control device, can not boost, out of the single-phase 220V AC inlet is three-phase 220V AC frequency converter.
