Motion sensor utilizing eddy currents

Details Motion sensor utilizing eddy currents Motion sensor utilizing eddy currents

1981-12-16

1984-03-27

Krawczewicz, Stanley T.

Electricity: measuring and testing

Electrical speed measuring

Including speed analog electrical signal generator

324208, 324174, G01P 346, G01P 352

Patent

active

044397283

ABSTRACT:
A sensor for measuring motion past the sensor of a non-magnetic conductive part surrounded by a non-magnetic conductive shield. The sensor consists of a bias magnet and pickup coil located outside the shield. Eddy currents are generated in the part as it moves through the magnetic field of the bias magnet. The eddy currents create an electromagnetic field around the part that penetrates the conductive shield causing the generation of secondary eddy currents in the shield. Secondary electromagnetic fields created by the secondary eddy currents induce a voltage in the pickup coil, a parameter of which is indicative of motion of the part.

REFERENCES:
Kripl, Brushless Tachometer System, IBM Technical Disclosure Bulletin, Jun. 1973, pp. 237 & 238.

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