1996-02-01

Wheel Speed Sensor Applying the Eddy Current Effect Through the High-Frequency Modulated Magnetic Field 960755

This active-drive wheel speed sensor, developed by the high-frequency magnetic system, enables detection of very slow wheel speeds - hitherto difficult to accomplish with any conventional type of Magnetic Pick up - by applying the eddy current effect through the high-frequency magnetic field. The following report presents an analysis of the magnetic circuit which integrates the magnetic-field generating coil with the detection rotor, and the unique circuit system which ensures strength against eccentricity of the wheel rotor and air gap variations, etc.

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