| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotation angle detection device capable of suppressing a rotation angle error that may occur to accompany a change in a magnet magnetic flux or the addition of a disturbance magnetic flow even if the magnet magnetic flux changes or the disturbance magnetic flux is added.SOLUTION: A rotation angle detection device 11 comprises: a magnet-magnetic-flux detection circuit 112; a disturbance-magnetic-flux detection circuit 113; and a correction circuit 114. The magnet-magnetic-flux detection circuit 112 detects a magnet magnetic flux. The disturbance-magnetic-flux detection circuit 113 detects a magnetic flux which is except for the magnet magnetic flux and which is a disturbance magnetic flux in interlinkage with a magnetic sensor 111. The correction circuit 114 corrects a detection result of the magnetic sensor 111 on the basis of a detection result of the magnet-magnetic-flux detection circuit 112 and a detection result of the disturbance-magnetic-flux detection circuit 113. Owing to this, the detection result of the magnetic sensor 111 can be corrected on the basis of the magnet magnetic flux and the disturbance magnetic flux. Therefore, even if the magnet magnetic flux changes or the disturbance magnetic flux is added, it is possible to suppress a rotation angle error that may occur to accompany the change or addition.SELECTED DRAWING: Figure 1 |
