When current flows through a Hall element, it supplies a voltage perpendicular to the current flow if a magnetic field acts vertically on both. As this voltage runs proportionally to the magnetic field strength, it is extremely simple to conduct a contact-free angular measurement by attaching a position magnet on a rotating shaft.
In the recent past this technology has made advances that make this sensor
ideal for exact angular measurement. By combining several sensor elements and integrating the entire signal processing system in a few components, complex systems are possible in an extremely small space.
Both contact-free, shaft-guided and
contact-free systems without a mechanical shaft connection enable measurement over up to a full 360° or even over several rotations.