G - Physics – 01 – P
Patent
G - Physics
01
P
341/73.4, 340/14
G01P 3/48 (2006.01) B60T 8/171 (2006.01) G01P 3/488 (2006.01) H02K 21/38 (2006.01)
Patent
CA 1067983
ANTI-SKID SYSTEM HAVING IMPROVED SENSOR Abstract: An anti-skid system is disclosed having an improved wheel speed sensor. The sensor provides a frequency signal proportional to wheel velocity. The anti-skid circuit operates in dependency upon the value of the velocity signal to provide an anti-skid signal which is supplied to a brake control system for relieving brake forces applied to the wheel. The improved sensor is a variable reluctance voltage generator comprising a stator and a rotor. The rotor is mounted on the vehicle wheel so as to rotate therewith in close proximity to the stator. The rotor is made of ferromagnetic material and is provided with an annular array of rotor teeth. The stator includes three members defining a source of magnetic flux and a split magnetic path therefor. Two of the members are mounted so as to face the rotor to define a magnetic air gap therebetween. The members are oriented and configured such that a reluctance change in the first and second members caused by rotation of the rotor is essentially 180° out of phase while the reluctance change caused by like changes in the air gap spacing is essentially in phase. A coil has winding portions located on the stator to provide an output voltage having its maximum value when the reluctance changes are 180° out of phase.
215365
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