| 摘要 |
PURPOSE:To improve disturbance control by converting a motor current into two-phase current, i.e., a d-axis current in same direction as the flux of the field and a q-axis current perpendicular thereto, and controlling the d-phase current to become zero whereas controlling the q-phase current which produces torque based on an acceleration command value and an actual acceleration of motor. CONSTITUTION:Motor currents Iu, Iv of phases U and V are detected through a current detector and d-phase current Id is determined at a detected rotor phase through means 9 for converting three-phase current into two-phase current. On the other hand, d-phase current command is brought to zero and a d-phase voltage command Vd is determined by means of a current controller 5 through proportional integration feedback control. Q-phase current perpendicular to the d-axis is controlled by means of an acceleration controller 10 through acceleration feedback based on an acceleration command thus determining a q-phase command voltage Vq. Means 8 for converting two-phase voltage into three-phase voltage then determines command voltages Vu, Vv, Vw for phases U, V, W from command voltages Vd, Vq and a power converter 6 performs PWM control to feed driving currents Iu, Iv, Iw. |
