ROTATION ANGLE DETECTOR

摘要

A rotation angle detector has a rotation angle sensor and a microcomputer, where the sensor detects a change of a magnetic field of a magnet that rotates with a shaft. The microcomputer has a first corrector for correcting a pre-correction mechanical angle, based on a first correction value that corrects an error due to an assembly process for assembling the magnet and the sensor, and a second corrector for correcting the pre-correction mechanical angle based on a second correction value that corrects an error due to a spill magnetic flux that is generated by a supply of an electric current to a winding wire. In such configuration, the rotation angle detector may correct the error due to the spill magnetic flux, thereby enabling an accurate detection of a mechanical angle.

主权项

1. 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.