| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a bearing with a rotation sensor with a simple structure, which acquires not only pulse signals for detecting the number of rotation but also reference position signals and rotation direction. <P>SOLUTION: This bearing has a rotation side member 2 and a non-rotation side member 3 which rotate for each other via a rolling element 4. A magnetic encoder 7 is fixed on the rotation side member 2, and magnetic sensors 8A-8C are fixed on the non-rotation side member 3. The magnetic encoder 7 has first and second detected parts 7A, 7B polarized with multiple poles circumferentially with a constant interval. The first detected part 7A has a magnetic property disturbing part 15 that has disturbance in periodicity partly in the circumferential direction. Two magnetic sensors 8A, 8B for detecting the first detected part 7A are arranged so as to have a larger circumferential interval than a circumferential width of the magnetic property disturbing part 15 and to have an identical phase with each other in the repetition cycle of magnetic pole arrangement. A magnetic sensor 8C for detecting the second detected part 7B is arranged so as to have a phase difference of approximately 90°. <P>COPYRIGHT: (C)2003,JPO</p> |
