Device for contactless measurement of angle of rotation of linear motion between rotor and stator composed of a plurality of parts

US6232771A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Werner Herden · Gerlingen, DE
• Asta Reichl · Stuttgart, DE
• Klaus Marx · Stuttgart, DE
• Thomas Klotzbuecher · Welzheim, DE
• Friedrich Bielert · Oettingen, DE

Key dates

• Filing date: Nov 6, 1998
• Grant date: May 15, 2001
• Expiry date: Nov 6, 2018

Classification

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

Abstract

The measuring device for contactless determination of a rotation angle includes a rotatable permanent magnet (22) arranged in a stator (10) made of magnetically conductive material and including two stator segments (13,14) and a surrounding cup-shaped housing part (11). One stator segment (14) is mounted directly on the bottom (15) of the housing part (11) so that a magnetically conductive connection exists. A layer (18) of magnetically nonconductive material is present between the other stator segment (13) and the bottom (15) so that no magnetic flux is possible there. The rotatable permanent magnet (22) is arranged so that it is movable in an air gap between the two stator segments (13,14) and the housing part (11) with the direction of magnetic polarization oriented radially, i.e. toward the stator segments (13,14) or in the opposite direction. The measuring element (20) is arranged in the slot (12) between the two stator segments (13,14). Because of this structural design, it is possible to divide the magnetic flux so that a shift in the linear measurement range is possible so that no sign change occurs within the linear measurement range.