Torque and angle sensor development based on electromagnetic modeling

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Dr. Tevesz Gábor
Department of Automation and Applied Informatics

The main application of angular displacement sensors is the automotive industry.

The requirements in this industry are always changing: by the expansion of electric and autonomous vehicles, the robustness and EMC-compatibility is becoming more important.

The sensors must be less affected by undesired matter like water, oil and dust and also there are high expectations for the tolerance of axial and radial displacement and resonance.

In long term usage the sensor must be resistant against abrasion and aging.

Besides these criterias, the goal is to reach the required resolution and accuracy meantime having redundancy and not expanding costs.

Due to the the tightening requirmenets, the inductive technology gained space in the world of angular displacement sensors.

The main principle of these sensors is Faraday's induction law.

The base of these sensors is a coil that is formed on a PCB (printed circuit board), that interacts with a conductor plane so called target.

In the plane Eddy currents are induced, and this effect can be changed by the rotatin of the target if it has a special geometry.

We are examining the coil as a port and testing how the inductance chages to the effect of the rotating target.

During my work I investigated the working principle of the inductive sensors with excited coil and passive target.

I created network model and simulation model to do the investigation.

For the measurement of the sensor I created an FPGA based solution.

After the technology research, I designed a new torque sensor based on the inductive technology.

This paper shows the steps of the development of the sensor from simulating through PCB design to building and doing measurements.

This sensor has an innovative and unique solution for high resolution torque measurement that is going to be protected by a patent.


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