Magnetic tachometer or accelerometer having highly permeable edd

Details Magnetic tachometer or accelerometer having highly permeable edd Magnetic tachometer or accelerometer having highly permeable edd

1986-09-18

1988-06-14

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electrical speed measuring

Including speed analog electrical signal generator

324208, 73519, G01P 346, G01P 352, G01B 714

Patent

active

047514590

ABSTRACT:
A tachometer or accelerometer features a nonmagnetic, electrically-conductive, moving member whose velocity or rate of change of velocity is to be measured. A magnetic field is generated in a direction generally perpendicular to the direction of motion, creating eddy currents in the moving member which, in turn, create an eddy current magnetic field. The flux density of the eddy current field is measured by a Hall effect sensor to produce a signal representative of velocity or, alternatively, the rate of change of flux density of the eddy current field is measured by a coil producing a signal representative of the rate of change of velocity. A separate magnetic circuit for the Hall effect sensor or coil sensor, as the case may be, is provided so as to maximize the strength of the eddy current field by concentrating the sensed eddy current flux and thereby maximizing the device's sensitivity and accuracy while minimizing its susceptibility to error through interference.

REFERENCES:
patent: 3229202 (1966-01-01), Wenk
patent: 3359442 (1967-12-01), Kunrt et al.
patent: 3932813 (1976-01-01), Gallant
patent: 4439728 (1984-03-01), Rickman, Jr.
patent: 4441077 (1984-04-01), Dodgen et al.

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