Magnetic speed sensor
AssigneeThe Bendix Corporation
InventorsRex Wallace Presley, Jack Richardson Lorraine
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Abstract
A speed sensor for a vehicle wheel has a rotating tone wheel and a stationary E-shaped magnetic sensor having a sensing pole of square loop magnetic material positioned between two switching poles. A coil is wound on the sensing pole and the poles are magnetized to periodically reverse the flux in the sensing pole as the teeth on the tone wheel alternately pass the switching poles to induce a signal voltage in the coil corresponding to wheel speed and substantially free of noise components due to misalignment and vibrations of the tone wheel upon relative rotation of the tone wheel and magnetic sensor.
Claims10
A speed sensor for a vehicle wheel comprising a tone wheel driven by the vehicle and subject to misalignment and vibration, the tone wheel being made of magnetic material and having a plurality of teeth, and sensing means having a pair of switching poles of magnetic material and a sensing pole of square loop magnetic material positioned between the switching poles, the poles being positioned proximate the tone wheel teeth, coil means on the sensing pole, and means for magnetizing the poles to induce a signal voltage in the coil means corresponding to wheel speed and substantially free of noise components due to misalignment and vibration of the tone wheel upon relative rotation of the tone wheel and sensing means.
Dependencies are inferred from the claim text.