Rotational angle sensor system and method for the production thereof

摘要

Using integrated multi-component assembly injection molding, a two-part magnetic rotational angle sensor system having high sensing accuracy is very efficiently integrally produced in a tool as a functional unit that can be directly applied, comprising a polymer-bonded permanent magnet as a passive transmitter part in the first section, which can be rotated relative to the material of the active sensor receiver part, which material is sprayed thereon and then shrunk, with the potted receiver. For this purpose, injection molding materials are used that are mutually incompatible for adhesion and lift off from one another over the mutual contact regions due to shrinkage.

主权项

1. A rotational angle sensor system comprising a receiver part with magnetic field receiver in close proximity to a transmitter part, which is rotatable relative thereto, with polymer-bonded-injection-molded permanent magnet as the transmitter, characterized in that the sensor system, given a shaft as a central connecting component between the receiver part and the transmitter part which is rotatable counter thereto, is a combination of a transmitter part, which is formed from polymer, with an injection-molded receiver part, which is made of a plastic which is adhesion-incompatible with respect to the polymer and shrinks,
wherein the receiver part includes the central connecting component which is injected into an engagement opening in the transmitter part such that the central connecting component reaches through the transmitter part and has a stop which axially back-grips said transmitter part with an axial annular gap between the transmitter part and the stop.