| 摘要 |
PURPOSE:To improve the normal characteristic and responsiveness of an induction motor by detecting the magnitude of a vector from the primary current detected value, obtaining a correction value from a reference and a deviation to control to equalize the magnitude of the vector to the reference value. CONSTITUTION:A torque of an induction motor 4 is controlled by a voltage inverter 2 for controlling the pulse width by an instantaneous current value control. At this time, the magnitude of a vector is detected from the primary current of the motor 4, fed back to a correcting circuit 20, the output of a vector length detector 21 is fed through a filter 22, compared with the reference value of the vector length from a current reference calculator 8, the deviation amount is imputted to a controller 34 of a proportional integration, the reference value is corrected by an adder 25 so that the detected value is equalized to the reference value, and applied to an instantaneous value converter 9. Accordingly, even if the torque reference is abruptly varied, the currents at the power drive and regenerative times are equalized to control the torque and the magnetic flux to the desired value. |
