| 摘要 |
There is described a speed sensor that is particularly adaptable to moving vehicles such as automobiles. A permanent magnet, stator assembly, and field coil are held within a cup that is adapted to mate a bearing assembly of a non-driven wheel of the vehicle. Rotor poles are carried on the wheel spindle. A magnetic flux is provided by the permanent magnet, the flux passing through the rotor poles which rotate with the wheel and through poles of the stator assembly. As the wheel turns, the rotor poles are at times aligned with the stator poles across on air gap and at other times not aligned across an air gap, the air gap being in a plane parallel to the plane in which the wheel rotates. This results in a changing magnetic flux, which in turn generates an alternating voltage current in the field coil. The alternating current so generated is then fed through an electrical terminal to a vehicle computer.
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