paper 150305030621

Published: 2015-07-09

Use Case Analysis of Wiegand-based Energy Harvester in Mechanical Sensing Devices

Ulrich Bochtler,

Ulrich Bochtler

University of Applied Sciences Aschaffenburg, Germany

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Ralf Zentgraf

University of Applied Sciences Aschaffenburg, Germany

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Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)1580-1582

Abstract

Conventional energy harvester approaches using magnetic-inductive technologies are often realized as mass-spring systems. Due to the small resonance-bandwidth of such systems, bistable magnetic wires can be a sound solution for slow and sporadic movements. On this issue, a pressure sensor system is adapted with a so-called Wiegand-harvester to implement self-sufficient electrical feature functionalities. The Wiegand-harvester consists of an inductor coil mounted on an amorphous Vicalloy-Core (CoFeV). The large characteristic Barkhausen jump of the alloy is used to generate voltage peaks in the pickup coil in a slow changing magnetic field. Contrary to mass-spring systems or periodical induction, only the value of the coercivity field (∆Hce ) is relevant for generating an energetic voltage pulse to power an electrical circuit. This technology can be used in high transients as well as in nearly static environments. A use case analysis for a pressure gauge shows the benefit of Wiegand-based systems. The power supply source is realized by placing eight harvesters circular on a PCB. Thereby a single rotation of a spindle (360◦ ) is quantized in eight steps. A second disk equipped with eight neodymium permanent magnets is mounted parallel to the PCB. So a twist of 45◦ delivers a multiplied pulse in each of the eight inductor coils. An electrical energy output of approx. 13.5 µWs and the twist-hysteresis of 0◦ 20 could be achieved and verified using a magnetic FEM simulation.

Citation

Ulrich Bochtler, and Ralf Zentgraf, "Use Case Analysis of Wiegand-based Energy Harvester in Mechanical Sensing Devices," Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)1580-1582

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