ROTATION DETECTING DEVICE, AND BEARING HAVING ROTATION DETECTING DEVICE

摘要

Provided are a rotation detecting device enabled to improve a resolution and to detect an angle precisely and stably by reducing the noise components contained in a detected angle value, and a bearing with a detecting device having the rotation detecting device assembled therein. This rotation detecting device comprises a plurality of magnetic sensor elements for measuring the magnetic intensities of magnets mounted on a rotor, and angle calculating means (6) for calculating the rotation angles of the magnets from the measured values of those magnetic sensor elements. Further comprised are rotation state estimating means (12) for estimating the rotation state by processing statistically the data of the rotation angles outputted for a predetermined time period by the angle calculating means (6), rotation angle predicting means (14) for predicting the subsequent rotation angles from the rotation state estimated by that rotation state estimating means (12), and output means (9) for calculating and outputting the rotation angle on the basis of the rotation angle predicted by the rotation angle predicting means (14).