VECTOR CONTROLLER AND MOTOR CONTROL SYSTEM

摘要

PROBLEM TO BE SOLVED: To correctly estimate a magnetic pole position even when axis deviation amount Δθ increases transiently by such as impact or disturbance.

SOLUTION: A vector controller comprises: alternate voltage generation means 6 for superposing an alternate voltage at a frequency differing from a frequency of a motor current after decomposing it into a magnetization axis voltage component and a torque axis voltage component; high-frequency current phase difference calculation means 7 for calculating a phase difference between a high-frequency current and the alternate voltage Vdh*, Vqh*by subtracting a phase of a superposition axis from a phase (arctan(ΔIqc/ΔIdc), or arctan(ΔIbc/ΔIac)) of the high-frequency current generated in the motor current by the alternate voltage; superposition phase adjustment means 8 for adjusting the phase direction of the superposition axis so that the phase difference calculated by the high-frequency current phase difference calculation means is zero or a predetermined target value; axis deviation amount calculation means 9 for calculating axis deviation amount between the magnetization axis and the superposition axis whose direction is adjusted by the superposition axis adjustment means; and magnetization phase adjustment means 10 for adjusting the phase direction of the magnetization axis so that the axis deviation amount is zero.

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