# US 2008/0186019 A1 · Arrangement Comprising A Magnetic Field Sensor

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- Number: US 2008/0186019 A1
- Document ID: US20080186019A1
- Status: Published application
- Kind: A1
- Application number: 11/630,587
- Filed: 2005-06-16
- Published: 2008-08-07
- Earliest claimed: 2004-06-25
- Assignees: NXP B.V.
- Inventors: Michael Hinz
- Web page: https://patentgrep.com/patent/US20080186019A1

## CPC

- G01D 5/145: {influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06)}
- G01D 5/2451: {Incremental encoders (G01D5/2454 takes precedence)}
- G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR

## Abstract

In an arrangement comprising a magnetic field sensor which is effectively connected to a magnetic encoder which is arranged such that it can move with respect to the sensor and comprises magnetic poles with alternating polarity, wherein the sensor consists of at least two half-bridges which are in each case formed by two magnetoelectric elements, the electrical properties of which depend on the magnetic field strength, it is provided that the elements of each half-bridge have resistance/field strength characteristics which run in opposite directions and are arranged such that they are in phase with respect to the magnetic field, and that the spacing between the half-bridges corresponds to part of the pole pitch of the magnetic encoder.

## Claims

### Claim 1

An arrangement comprising a magnetic field sensor which is effectively connected to a magnetic encoder which is arranged such that it can move with respect to the sensor and comprises magnetic poles with alternating polarity, wherein the sensor consists of at least two half-bridges which are in each case formed by two magnetoelectric elements the electrical properties of which depend on the magnetic field strength, characterized in that the elements of each half-bridge have resistance/field strength characteristics which run in opposite directions and are arranged such that they are in phase with respect to the magnetic field, and in that the spacing between the half-bridges corresponds to part of the pole pitch of the magnetic encoder

### Claim 2 (depends on 1)

An arrangement as claimed in claim 1, characterized in that the spacing between the half-bridges corresponds to one quarter of the pole pitch of the magnetic encoder

### Claim 3 (depends on 1)

An arrangement as claimed in claim 1, characterized in that the spacing between the half-bridges is not equal to one quarter of the pole pitch of the magnetic encoder, and in that at least one of the output signals of the half-bridges is subjected to phase correction.

### Claim 4 (depends on 1)

An arrangement as claimed in claim 1, characterized in that the magnetoelectric elements are magnetoresistive elements with barber poles, wherein the orientation of the barber poles is opposed in such a way that the resistance/field strength characteristics are opposed.

### Claim 5 (depends on 4)

An arrangement as claimed in claim 4, characterized in that the orientation of the barber poles is offset by 90° with respect to one another.

### Claim 6 (depends on 1)

An arrangement as claimed in claim 1, characterized in that the output signals of the at least two half-bridges are converted into binary signals, and in that the binary signals are logically linked.

### Claim 7 (depends on 1)

An arrangement as claimed in claim 1, characterized in that the output signals of the at least two half-bridges are converted into a signal which changes linearly with the movement of the encoder by applying an inverse trigonometric function.