| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve shortening of deceleration time when an AC motor is decelerated by an inverter with no brake resistor and to achieve torque ripple reduction. <P>SOLUTION: The inverter controller of an AC motor for driving an AC motor by V/f control comprises a converter 1 for converting the alternating current of a three-phase power supply into a direct current, a smoothing capacitor 2, an inverter 3, a V/f pattern operating unit 10 outputting an output voltage command, a phase operating unit 11, a vector operating unit 12, a DC voltage detector 13, an output voltage regulation coefficient operating unit 14, a PWM operating unit 15, and a gate drive circuit 16, and further provided with a voltage addition V/f pattern operating unit 18 for adding a predetermined voltage command when the DC voltage of the inverter 3 rises during drive of an AC motor 4, and a superposition voltage operating unit 17 for operating a second voltage component having a predetermined frequency and a predetermined voltage amplitude. <P>COPYRIGHT: (C)2007,JPO&INPIT |
