Novel Wiegand-effect based energy harvesting device for linear magnetic positioning system
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TECHNICAL PAPER
Novel Wiegand-effect based energy harvesting device for linear magnetic positioning system Chia-Chieh Chang1 • Jen-Yuan Chang1 Received: 30 October 2019 / Accepted: 25 May 2020 Ó Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this study, energy harvesting devices using Wiegand-effect transducer is investigated through integration with linear positioning measurement system. With the device, energy can be harvested due to the changes of magnetic polarities from linear position measurement system. Using numerical finite element method, the energy harvesting module is parametrically investigated to offer the optimal design in the magnetic guide that directs the dynamic magnetic field into the Wiegand transducer. From experiments, the influence of parameters such as geometry, speed and gap size has been validated to offer optimal design composition to provide the highest energy output from the system.
1 Introduction Wiegand transducer originally proposed by J.R. Wiegan and M. Velinsky (Wiegan and Velinsky 1974) is generally classified as a pulse generator (Wigen 1975) to be used in gas meters and card readers (Wiegand 1981). Due to the growing research field of micro-generators and energy harvesters, Wiegand transducer is also considered as the possible energy source for micro self-propelled devices (Saggomo et al. 2015) or medical implant devices (Takahashi et al. 2018). Due to the self-propelled and speed independent properties of Wiegand transducer, the transducer is found to be suitable for applying in the mechanical and automotive industry with Hall-effect sensor (Takamura et al. 2017). Wiegand transducer is consisted of Wiegand wire and sense coil. The Wiegand wire is made of Vicalloy, which is a kind of magnetic alloy that changes its magnetic properties under different residual stress (Abe and Matsushita 1995; Abe et al. 1997). Based on the basic properties of Wiegand transducer, when the transducer is subjected to external magnetization, affected by the bi-stability characteristics between different magnetic layers in the wire when subjected to change in magnetization, impulse in the sense coil can occur due to difference in electric potentials in & Jen-Yuan Chang [email protected] 1
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
the Wiegand wire (Vazquez et al. 1994). The physics behind this pheromone is due to the difference of coercivity in the Wiegand wire, which is commonly referred as Wiegand effect. In this study, a novel energy harvesting device based on Wiegand effect is proposed, studied and validated along with the corresponding signal processing circuit (Sun et al. 2019) in optimizing output signal from the Wiegand transducer. With the aims placed on harvesting energy from alternation of magnetic polarities from linear magnetic positioning systems and to properly direct and enhance the dynamic magnetic field from the system into the Wiegand sensor, a nove
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