Measuring device for contactless detection of a rotational angle

US6396260B1 · kind B1 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Asta Reichl · Stuttgart, DE
• Wolfgang Schaefer
• Reiner Schweinfurth · Eppingen, DE
• Michael Stoeve · Hirschaid, DE
• Thomas Klotzbuecher · Welzheim, DE
• Stephan Wuensch · Nuremberg, DE

Key dates

• Filing date: Jul 24, 2000
• Grant date: May 28, 2002
• Expiry date: Jul 24, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D5/145
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A measuring device for contactless detection of a rotational angle (&agr;) comprises a carrier plate (12), made of soft-magnetic material, which acts as a rotor. Two segments (15, 16) separated by a slit (17) are disposed in a plane parallel to the carrier plate (12). Disposed on one of the segments (16) is a short-circuit piece (20), and all these parts are of soft-magnetic material. The short-circuit piece (20) and the segments (15, 16) serve to guide the magnetic flux that is generated by a permanent magnet (13) disposed on the carrier plate (12). Since the short-circuit piece (20) protrudes past the carrier plate (12), or in a further feature the carrier plate (12) protrudes past the short-circuit piece (20), insensitivity to axial or radial play is possible. Furthermore, the measuring device is relatively simple and space-saving in design.