Modules for scanning toothed structures

The modules offer new capabilities for robust and precise scanning of metallic toothed structures using GMR technology with an optimised magnet, matched to each other and incorporated into a module.

The sensor modules for scanning metallic toothed structures are a new addition to the new GLM family. They are designed for direct mounting on a circuit board, and contain the sensor element and the critically important magnet. Incorporation of the magnet eliminates the need for laborious adjustment by the user. The sensor element used is a GMR (Giant Magneto-Resistive) sensor, which provides non-contact scanning of the toothed structures on a pattern of 1 mm, 2 mm, 3 mm, module 0.3 and module 0.5. The layout of the sensor element and the magnet creates a robust design, not susceptible to external magnetic fields. The sensor element that is used has been well proven in many applications and offers a simple assembly variant for the new module. The operating temperature range from -40°C to +150°C permits use in motors, for instance for rotational speed sensing.

The advantages of the GMR toothed structure sensor module are not only its robustness and absence of susceptibility to external interference, but also its variable installation orientation (upright or horizontal), elimination of the need for adjustment of the magnet to the sensor chip and its high cut-off frequency of more than 1 MHz.