Patent ID: 8159177

Claim:
A system for realizing rotor variable frequency speed control asynchronously and simultaneously by driving multiple motors via one inverter, comprises a motor group, rectifier group, chopper group, isolator group, amperite group, power capacitor group, inverter, speed feedback voltage detector and current feedback voltage detector, wherein: the respective rotors of four motors M 1 , M 2 , M 3 and M 4 in said motor group are respectively connected to the respective corresponding input terminals of four rectifiers Z 1 , Z 2 , Z 3 and Z 4 in rectifier group in turn; the respective cathodes E of four choppers IGBT 1 , IGBT 2 , IGBT 3 and IGBT 4 in said chopper group respectively intersect with the anodes of the respective corresponding three rectifier diodes of four rectifiers Z 1 , Z 2 , Z 3 and Z 4 in said rectifier group at one point, i.e., point D, in turn; wherein: said inverter is a full-bridge inverter, which comprises six silicon controlled invertors, i.e., KP 1 , KP 2 , KP 3 , KP 4 , KP 5 , and KP 6 , and the three connection points of the output terminals KP 1 and KP 4 , KP 2 and KP 5 , KP 3 and KP 6 are respectively connected to the ends A, B and C of a three-phase industrial AC power supply in turn, and then connected to the respective stators of the four motors M 1 , M 2 , M 3 and M 4 in said motor group.