| 摘要 |
PROBLEM TO BE SOLVED: To provide a controller of permanent magnet synchronous motor capable of reducing position arithmetic error and performing stable control even when position arithmetic error is large.SOLUTION: A controller controls the current and the terminal voltage on a γ-axis and a δ-axis estimated from a d-axis which is an axis parallel to a rotor magnetic pole direction of an electric motor and a q-axis which is an axis perpendicular thereto while converting the current and the terminal voltage on a permanent magnet synchronous motor 80 into a vector respectively. The controller includes: means for estimating an x-axis which is a direction axis to apply a high-frequency AC voltage to the electric motor and a y-axis as an axis perpendicular thereto to overlap the x-axis with a high-frequency AC voltage; means for calculating an inductance from a current equivalent value on the electric motor; means for calculating an angular difference between the γ-axis and the δ-axis, the x-axis and the y-axis from the inductance; means for detecting a y-axis high frequency current amplitude from the γ-axis current, the δ-axis current and the angular difference; and means for calculating a position of the pole from the y-axis high frequency current amplitude. |
