ROTATION ANGLE DETECTION DEVICE AND ROTATION ANGLE DERIVATION METHOD

To obtain a rotation angle detection device and a rotation angle derivation method capable of highly accurately detecting a rotation angle of a rotation shaft of a rotary electric machine with a simple structure.SOLUTION: A magnetic flux of a rotor constituted of a permanent magnet 80 of a rotary electric machine 100 is detected by a rotation angle sensor 10 mounted at a position separated from a rotating shaft 60 of a rotor. The rotation angle of the rotating shaft 60 derived on the basis of change in the magnetic flux detected is corrected and outputted by a correction value correcting an error between the rotation angle and an ideal angle varying equally from 0 to 360 degrees.SELECTED DRAWING: Figure 1 【課題】簡素な構造で回転電機の回転軸の回転角度を高精度で検出可能な回転角度検出装置及び回転角度の導出方法を得る。【解決手段】回転電機１００の永久磁石８０で構成された回転子の磁束を、回転子の回転軸６０から離れた位置に実装された回転角センサ１０で検出し、検出した磁束の変化に基づいて導出した回転軸６０の回転角度を、当該回転角度と、０から３６０度まで等差で変化する理想角度と、の誤差を補正する補正値で補正して出力する。【選択図】図１