Magnetic angle sensor unit having ferromagnetic conductive shielding

US8461829B2 · kind B2 · utility

Assignee

• ASM Automation Sensorik Messtechnik GmbH · DE

Inventors

• Klaus Manfred Steinich · Straubing, DE
• Peter Wirth · Winsen, DE

Key dates

• Filing date: Jan 7, 2008
• Grant date: Jun 11, 2013
• Expiry date: Jun 2, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D2205/50
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A sensor unit including a Hall or magnetoresistive angle sensor detecting around its longitudinal axis. The angle sensor includes a magnetically sensitive face surface portion and sensor element proximal to a face surface fixed in place. At least one magnet unit is disposed so that its magnetic field permeates the angle sensor, and field lines of at least one encoder magnetic of the at least one magnetic unit extend parallel to a sensitive plane of the sensor element wherein the encoder magnet is rotatable. A magnetically conductive shielding made of ferromagnetic material includes at least one sensor shielding fixed in place and an encoder shielding rotatable together with the encoder magnet.