| 摘要 |
<p>A bearing unit with a rotational speed detection unit is described and has a tone wheel (13) which has recesses (31) on its outer peripheral surface and rotates with an magnetic hub (1) and an inner ring (5), a sensor (20) which has a first stator (32) with notches and a second stator (33), and a permanent magnet (22), so that due to the changes in phase of the notches (28) and recesses (31), the density of the magnetic flux from the permanent magnet (22) is changed, with the magnetic flux led to the second stator (33) and to the hub (1) and inner ring (5), whereby the number of winding in the coil (24) is increased. <IMAGE></p> |
