Speed insensitive wheel detector

Details Speed insensitive wheel detector Speed insensitive wheel detector

1978-05-18

1980-11-25

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

246249, 310118, H02K 2138

Patent

active

042360935

ABSTRACT:
An apparatus for detecting the presence and/or direction and/or velocity of a moving ferromagnetic element is provided. A sensing coil is placed in coupling relationship with a bi-stable ferromagnetic wire to provide a signal in response to a change in polarity of the core of the bi-stable wire. The core polarity changes in response to element presence as the element constitutes a magnetic shunt causing a change in magnetic flux density and/or direction in the air gap of a magnetic circuit in which the bi-stable wire is situated. The sensor is substantially insensitive to element velocity. Modified structures provide for fail-safe operation.

REFERENCES:
patent: 3697745 (1972-10-01), Bolton
patent: 3780313 (1973-02-01), Wiegand
"Wiegand Wire: New Material for Magnetic-Based Devices", Electronics, 7/10/75, pp. 100-105.

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