Magnetization Coding of magnetic pole rings and linear scales

As a manufacturer of magnetic sensors and a supplier of complete sensor solutions, magnetization know-how is another of our core competencies.  In addition to our high-precision magnetization facilities for pole rings and linear scales, we apply simulation tools in order to optimize the magnetization of the measurement scales. This enables us to evaluate parameters like magnetic material, air gap and alignment tolerances and to select or design the ideal measurement scale for your application. Of course the chip characteristics of our MR sensors are reflected in the calculations in order to achieve maximum performance for the overall system.

Our magnetization systems are equipped with high-precision reference systems which provide highest accuracy during the magnetization process as well as during the subsequent measurement. The magnetization systems are designed for series application and cost effective production. Furthermore this concept allows a highly flexible utilization for samples and small volumes as well. This is a special advantage because the production takes place on series production systems and the costs for sample production can be kept to a minimum even in early development stages.

The magnetization is carried out using a pulse method. This means that each magnetic pole is incorporated into the magnetic material with a very high field strength. For example, this enables the magnetization of plastic bonded NeFeB materials. When magnetizing the pole rings, the resulting “joint" between the start and end of the magnetization is eliminated by an intelligent process.

Pole rings and linear scales can be magnetized with up to 3 tracks. In addition to purely incremental tracks, it is also possible to magnetize reference tracks with one or more poles and of course code tracks with different north and south pole patterns.

If you require assistance in choosing an appropriate measurement scale (pole ring or linear scale) or a sensor, please contact our sales team. We are also happy to assess the possible installation situation together with our development engineers and support you during design activities.

Simple calculation tools are available, helping to ensure the optimal and rapid design of the operating parameters of a sensor on a pole ring. Parameters such as the number of poles, pole width, ring diameter as well as air gap between the sensor and the pole ring can be varied in order to put together the best combination.

Complex simulation tools allow error adjustments and disturbance variables, as well as the influence of the magnet geometry and the material to be assessed in the preliminary stages and impact on the signal quality and/or the resulting errors to be visualized. This facilitates the selection of an appropriate material and the right sensor.

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