Angular measurement tasks on moving equipment such as dancer arms or articulated joints are often handled using carbon-film potentiometers. The load placed on the wiper contacts by the fast, continuous motion is enormous, resulting in obvious wear.
The new magnetic rotary sensors of the MDRM/MDFM family, from Baumer, provide a reliable, maintenance-free solution.
The sensors, operating on the magneto-resistive principle, function completely without maintenance, without bearings and without wiper contacts. As a result, they guarantee a long lifetime, even in difficult environments involving dust, fibres and moisture. In contrast to mechanical potentiometers, the MDRM/MDFM sensors allow measurement around the 360° circumference of rotation without a dead band. Cylindrical and rectangular housings facilitate installation under the most varied spatial circumstances. In particular, the rectangular version, with a mounting depth of 8 mm, fits behind almost any machine casing. Current or voltage outputs allow direct connection to standard interfaces without additional conversion modules.
The 8-bit version is suitable for angular measurement in applications requiring only coarse positioning. However, there is also a version using 12 bits and providing a maximum resolution of 0,09° for small precision control systems.
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