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SUMMARYThe mechanical contact-type potentiometer that has been conventionally used as a position sensor is known to have the problems of contact reliability and lifetime. Therefore, we have developed a noncontact linear position sensor using impedance change based on displacement. In this paper, we evaluate the AC magnetization characteristics of the core material used for such a sensor, and investigate how to use the complex magnetic permeability in three-dimensional finite element analysis. In addition, the impedance characteristics of the noncontact magnetic position sensor are calculated using the measured complex magnetic permeability of the core. The validity of our method is verified by comparing the measurements of the prototype to calculated values.

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