Inductive speed sensor employing phase shift

Details Inductive speed sensor employing phase shift Inductive speed sensor employing phase shift

1988-09-02

1990-08-07

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324161, 324166, G01P 348, G01P 360

Patent

active

049471163

ABSTRACT:
A speed detector, for use with a tone wheel having metal teeth, employs two coils positioned in offset relation near the tone wheel for interacting with the tone wheel teeth and thus changing their respective inductances. The coils preferably include iron cores to enhance magnetic coupling. One coil is in a phase sense oscillator circuit and the other is an a tuned sensor network. The oscillator is coupled to, and drives, the tuned network. The change in coil inductances effects a phase shift of the resulting signals in the oscillator and the tuned network, the magnitude of that phase shift typically being double that for a comparable single coil system. The output signals of the oscillator and tuned network provide inputs to a phase condition detector which looks for a reversal in their phase sequence and uses such event to provide timing reference pulses for a final determination of speed in a known manner.

REFERENCES:
patent: 3641535 (1972-02-01), Knopf
patent: 3716787 (1973-02-01), Hammond
patent: 3721859 (1973-03-01), Blanyer
patent: 3728565 (1973-04-01), O'Callaghan
patent: 3750128 (1973-07-01), Sapir
patent: 3758858 (1973-09-01), McCue
patent: 4161693 (1979-07-01), Carlson
patent: 4764685 (1988-08-01), Bleckmann et al.

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