Magnetoresistive angle sensor

• US 20030011360A1
• Filed: 06/10/2002
• Published: 01/16/2003
• Est. Priority Date: 07/13/2001
• Status: Abandoned Application

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Jausel, Heiko, Porth, Wolfgang
• Application Number:
  US10/167,236
• Publication Number:
  US 20030011360A1
• Time in Patent Office: Days
• US Class Current: 324/207.21
• CPC Class Codes: G01D 2205/80 Manufacturing details of magnetic targets for magnetic encoders
• CPC Class Codes: G01D 5/145 influenced by the relative movement between the Hall device and magnetic fields see G01R33/06

Abstract

A magnetoresistive angle sensor for use in areas with temperatures in excess of 160° C. has a fixed magnetic field sensor (2, 3), which is surrounded by a permanently magnetic rotor (8) and a shielding ring (9) rotating with the latter. The magnetic field sensor (2, 3) is designed for determining the angular position of this rotor (8). The rotor (8) forms a ring, surrounding the magnetic field sensor (2, 3), of a plastic with rare-earth magnetic material incorporated in it, which material is a compound of neodymium, iron and boron.

Claims

1. A magnetoresistive angle sensor for use in areas with temperatures in excess of 160°

C., in which a fixed magnetic field sensor is surrounded by a permanently magnetic rotor and a shielding ring rotating with the latter, the magnetic field sensor serving for determining the angular position of this rotor, characterized in that the rotor (8) is formed as a ring of a plastic with rare-earth magnetic material incorporated in it.

2. The magnetoresistive angle sensor as claimed in claim 1, characterized in that the rare-earth magnetic material is a compound of neodymium, iron and boron.

3. The magnetoresistive angle sensor as claimed in claim 1 or 2, characterized in that the plastic incorporating the rare-earth magnetic material is polyphenylene sulfide (PPS) or a liquid-crystal polymer (LCP).

4. The magnetoresistive angle sensor as claimed in at least one of the preceding claims, characterized in that the rotor (8) is molded directly onto the inside of the shielding ring (9) by the injection-molding process.

5. The magnetoresistive angle sensor as claimed in claim 4, characterized in that the shielding ring (9) has in its inner lateral surface back-molded formations for producing a form fit with the molded-on rotor (8).

6. The magnetoresistive angle sensor as claimed in at least one of the preceding claims, characterized in that a magnet holder (10) is molded onto one side of the assembly comprising the rotor (8) and the shielding ring (9).