Speed sensor pickup assembly with slotted magnet

Details Speed sensor pickup assembly with slotted magnet Speed sensor pickup assembly with slotted magnet

1988-10-25

1990-06-26

Strecker, Gerard R.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

73519, 188181R, 310155, 310168, G01P 3488, B60T 832

Patent

active

049375229

ABSTRACT:
A dual speed sensor pickup assembly (140) for sensing the rotational velocity of two independently rotatable, closely axially spaced exciter rotors (116 and 118) is provided. The pickup assembly includes two speed sensor assemblies (136 and 138) each including a pole piece (152,160) having a longitudinal axis (152a,160a) with the longitudinal axes skewed relative to one another but radial relative to the common axes of rotation (24) of the exciter rotors. Each speed sensor includes a permanent magnet (154,162) disposed between an end of the pole piece (152,160) and having a face divided into first and second surfaces (154a,154b and 162a,162b) by a slot (154c,162c) therein. In one embodiment a primary coil (156,164) and a secondary or anti-cross talk coil (158,166) surrounds the pole piece of each sensor (136,138), and each secondary coil is conductively connected to the primary coil of the other sensor. In another embodiment, an electronic circuit (176) is provided for producing anti-cross talk signals which are added to the speed sensor signals.

REFERENCES:
patent: 3626225 (1971-12-01), Pauwels
patent: 4045738 (1977-08-01), Buzzell
patent: 4276489 (1981-06-01), Dron et al.
patent: 4370614 (1983-01-01), Kawada et al.
patent: 4596973 (1986-06-01), Form et al.
patent: 4626781 (1986-12-01), Forkel
patent: 4700133 (1987-10-01), Day
patent: 4712064 (1987-12-01), Eckardt et al.
patent: 4745363 (1988-05-01), Carr et al.
Klein et al, Introduction of Antilock Braking Systems for Cars, Paper 741084 presented at the International Automobile-Engineering and Manufacturing Meeting, Toronto, Canada, Oct. 1974.

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