Multiturn shaft position sensor having magnet movable with nonro

Details Multiturn shaft position sensor having magnet movable with nonro Multiturn shaft position sensor having magnet movable with nonro

1987-12-29

1989-06-20

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

34087033, G01B 730

Patent

active

048412465

ABSTRACT:
The present invention is a shaft position sensor for detection of the position of a multiturn shaft. The rotation of the multiturn shaft is converted into a linear motion via a multiturn screw and a nonrotating nut. A magnet is mounted on the nonrotating nut. The linear movement of the magnet is converted into an electrical signal using one or more magneto resistive structures. A pair of flux plates is disposed on either side of the linear path of the magnet with at least one narrow gap opposite one end of the linear path of the magnet. A single magneto resistive structure is disposed in each such narrow gap. An electrical circuit measures the resistance of the one or more magneto resistive structures, this resistance varying with magnetic flux, and generates an electrical position signal which indicates the rotary position of the multiturn shaft. Linearity in response can be provided by a flux shunt which blocks magnetic flux directly from the magnet, control of the distance of the flux plates from the linear path of the magnet, or varying the magnetic permeability of the flux plates with position along the linear path, for example, by varying the thickness of the flux plates.

REFERENCES:
patent: 3973191 (1976-08-01), Zabler

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