Магнитная лента

Description Structure and specification Coding Installation Product description Structure and specification The magnetic strip consists of three firmly glued components: 1) Two-track magnetic strip made of plastic which holds the position information (scale), 1 mm pole width, distance-coded 2) Transfer adhesive tape with protective foil 3) Stainless steel flexible conductive strip 4) Track 1 (incremental side) 5) Track 2 (reference side) Pole search film With the pin search film, the magnetization of the two-track magnetic strip can be checked. Technical data Coding The magnetic strip has two tracks, with an incremental and a reference side. The incremental track comprises 1 mm increments. On the reference side, distance-coded reference marks are provided. The clear arrangement of the reference marks ensures that an absolute position is already available when two marks have been passed. Thus, measuring lengths of up to 17.8 m are possible. The necessary minimum length 1) of the magnetic strip for evaluating the distance-coded reference marks is 400 mm. If the length of the magnetic strip is shorter than 400 mm, the measuring system may only be used as incremental measuring system without evaluation of reference marks. 1) The minimum length can also be shorter, depending on the mechanical design 1) Incremental side 2) Reference side Material CPE with 90% strontium ferrite (magnet carrier) Coding Incremental, two-track system (reference track) Pole pitch 1mm Reference track Distance-coded, TR = 192 mm Minimum length for the evaluation of the distance coding 400mm Operating temperature, processed -20...+80°C Optimum storage temperature, unprocessed +18°C Adhesion temperature +18...+30°C Humidity Max. 95%, non-condensing Accuracy ±20µm/m Carrier strip material Precision steel strip, 1.4310 Adhesive tape 3M-9088 Dimensions Width: 8 / 10 / 12 mm ± 0.1 mm Thermal expansion coefficient α = 16 x 10-6 1/K Thermal longitudinal expansion In the glued-on condition, the longitudinal expansion of the magnetic strip corresponds to the one of the rail. With a massive substructure, the latter is in turn determined by the longitudinal expansion of the substructure. Weight Ca. 60 g /m Impact of external magnets External magnetic fields at the surface of the magnetic strip max. 64 mT (640 Oe; 52 kA/m) to prevent damage. Bending radius Min. 150mm Mounting Mounting The magnetic strip is mounted by adhesion of the rail slot. Before mounting, the correct mounting orientation is to be ensured since, with the mounted magnetic strip, the push-on direction and thus the position of the reference edge of the runner block are determined. A magnetic strip which has already been glued on is destroyed after its removal and cannot be re-used. Before the adhesion of the magnetic strip, the latter is to be stored near the rail (ideally in the slot) for approx. 30 minutes so that the temperature corresponds to the rail temperature and any tensions due to thermal expansion can be exclu