| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve accurate torque control in an AC electric motor control device. <P>SOLUTION: This control device is provided with a speed computation unit 12 that computes rotational speed based on a rotor phase from a rotational angle sensor 14 of a synchronous motor 13, a magnetic-flux estimate unit 10 that computes a magnetic-flux absolute value and a magnetic-flux phase from the rotational speed from the speed computation device 12 and a voltage command to an inverter 5, a coordinate converter 9 that computes a torque current feedback value from a current detection value and the magnetic-flux phase from a current sensor 8 of the synchronous motor 13, a current command computation unit 2 that computes torque current command from a torque command and the magnetic-flux absolute value, and a current controller 4 that controls an output voltage of the inverter 5 so that the torque current feedback value corresponds to the torque current command. <P>COPYRIGHT: (C)2007,JPO&INPIT |
