Rotation angle detector

A rotation angle detector for detecting a rotation angle of a rotating electric machine that has a shaft, a rotor rotating with the shaft, and a stator having a winding wire wound on the stator, the rotation angle detector comprising:

• a sensor part sensing a change of a magnetic field of a detectee that rotates with the shaft;
• and
• a controller including:
• a pre-correction angle calculator calculating a pre-correction mechanical angle based on a detection value of the sensor part;
• a first corrector correcting the pre-correction mechanical angle based on a first correction value that corrects an error of angle caused by an error in an assembly process for assembling the detectee and the sensor part;
• and
• a second corrector correcting the pre-correction mechanical angle based on a second correction value that corrects an error of angle due to a spill magnetic flux that is generated by a supply of an electric current to the winding wire.