Improved switched reluctance speed sensor

摘要

A bearing assembly for a vehicle including a fixed element (14), a rotating element (18) rotating relative to the fixed element (14) about an axis (22), and an annular sensor (10) connected to one of the fixed element and the rotating element. The sensor includes a pick-up coil (30) and an annular magnet (86) connected to the pick-up coil (30). The magnet (86) has a plurality of magnetic regions (94) which alternate in polarity around the magnet (86). The magnet generates a magnetic flux path magnetically coupling the magnet (86) to the coil (30) and resulting in the generation of an electrical signal in the coil. The rotating bearing element (18) includes a plurality of gear teeth (110). The gear teeth (110) generate a change in the reluctance of the magnetic flux path to vary the electrical signal in response to the angular speed of the fixed element (14) relative to the rotating element (18).