Abstract
Magnetic and inductive sensors are the dominant technologies in angular position sensing for automotive applications. This paper introduces a new angular sensor: a hybrid concept combining the magnetic Hall and inductive principles. A magnetic Hall transducer provides an accurate angle from 0° to 180°, whereas an inductive transducer provides a coarse angle from 0° to 360°. For this novel concept, a hybrid target with a magnetic and inductive signature is also needed. Using the two principles at the same time enables superior performances, in terms of range, compactness and robustness, that are not possible when used separately. We realized and characterized a prototype. The prototype achieves a 360° range, has a high accuracy and is robust against mechanical misalignments, stray fields and stray metals. The measurement results demonstrate that the two sensing principles are completely independent, thereby opening the doors for hybrid optimum magnetic–inductive designs beyond the usual trade-offs (range vs. resolution, size vs. robustness to misalignment).
Highlights
Inductive [1] and magnetic sensors [2] are the favored choices in the automotive world for applications requiring position information
We propose in this paper a hybrid Hall-inductive sensor
The measurement setup and test results are presented, covering all key performance parameters. These results demonstrate that the hybrid sensor successfully extends the range of the magnetic sensor up to a 360◦ range, maintaining its high accuracy, its robustness against mechanical misalignments and its stray-field immunity without any cross-talk with the inductive sensor
Summary
Inductive [1] and magnetic sensors [2] are the favored choices in the automotive world for applications requiring position information. The stray fields can be readily rejected with a differential scheme [8], thereby meeting the SFI requirement specified in ISO 11452-8 [9] This scheme is referred to as “gradiometric”, as it senses the magnetic field gradient in the plane of the sensor. Inductive sensors operate with AC fields in the MHz range They are naturally immune to low-frequency stray fields. The measurement setup and test results are presented, covering all key performance parameters These results demonstrate that the hybrid sensor successfully extends the range of the magnetic sensor up to a 360◦ range, maintaining its high accuracy, its robustness against mechanical misalignments and its stray-field immunity without any cross-talk with the inductive sensor. The paper concludes with a comparison against other sensors in the state of the art and a discussion of the design perspectives
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