Robert Boschgmbh

Peter Bigl

Martin Joerg

Mathias Kimmerle

Dietmar Hofmann

A sensor for a magnetic measuring device for detecting a rotational or translational movement of a body includes a permanent magnet which is connected to the body for conjoint rotation and which moves with the body. The sensor is fastened to a body by a method, and the sensor can be used in a magnetic measuring device for contactlessly detecting a rotational movement of a body. Plastic-bonded permanent magnet material is injection-molded onto the body, acting as an extension thereof, and forms a free end of the body acting as a permanent magnet.

Sensor for a magnetic measuring device

As is further apparent from FIGS.to, the illustrated exemplary embodiment of the measuring apparatuscomprises a second housingand a metal shielding platethat encompasses the second housing. In so doing, the metal shielding plateis formed in a closed manner and pushed over the second housing. The second housingis formed in the illustrated exemplary embodiment as a synthetic material housing. The measuring elementis formed in the illustrated embodiment as a TMR componentA that is based on the TMR effect (tunnel magneto-resistive effect) and cooperates with the permanent magnetthat is arranged on the end of the shaftA of the brushless EC motor in order to detect the prevailing rotational position of the shaftA. It is naturally also possible to use other measuring elementsthat are suitable to detect the prevailing rotational position of the shaft. In the illustrated exemplary embodiment of the measuring apparatus, a sensor electronic systemcomprises in addition to the measuring elementa circuit boardon which is positioned and fastened the measuring element, and multiple current railsare pressed into the circuit board [and held in position by the second housing. As a consequence, the rotational position signal that is detected by the measuring elementis transmitted by way of the circuit boardand the current railsto a (not illustrated) control device.

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Fischen, Germany

Peter Bigl