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Xu, Y., Bader, S. & Oelmann, B. (2019). Design, modeling and optimization of an m-shaped variable reluctance energy harvester for rotating applications. Energy Conversion and Management, 195, 1280-1294
Öppna denna publikation i ny flik eller fönster >>Design, modeling and optimization of an m-shaped variable reluctance energy harvester for rotating applications
2019 (Engelska)Ingår i: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 195, s. 1280-1294Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The variable reluctance principle can be used to convert rotational kinetic energy into electrical energy, creating a Variable Reluctance Energy Harvester (VREH) based on electromagnetic induction. This can be used to implement self-sustaining wireless sensors in rotating applications. In this paper, we present and investigate a novel design of a VREH with high volumetric power density that targets low-speed rotating applications. The design uses an m-shaped pole-piece and two opposing magnets. We theoretically analyze key design parameters that influence the VREH’s output power, and relate these parameters to geometrical design factors of the proposed structure. Key design factors include the coil height, the permanent magnet height and the tooth height. A method based on numerical simulations is introduced, enabling to determine the optimal geometrical dimensions of the proposed structure under given size-constraints. The results demonstrate that the method leads to optimal structure configurations, which has been evaluated for different cases and is verified experimentally. Good agreement between numerical simulations and experiments are reported with deviations in output power estimation below 3%. The optimized m-shaped VREH, moreover, provides output power levels sufficient for wireless sensor operation, even in low-speed rotating applications.

Nyckelord
Energy harvesting, Rotational energy, Variable reluctance, Power density, Design method, Sensor systems
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
urn:nbn:se:miun:diva-36250 (URN)10.1016/j.enconman.2019.05.082 (DOI)000482244300099 ()2-s2.0-85066501919 (Scopus ID)
Projekt
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Forskningsfinansiär
KK-stiftelsen, ASIS 20140323Vinnova, 2017-03725
Tillgänglig från: 2019-06-05 Skapad: 2019-06-05 Senast uppdaterad: 2020-01-29Bibliografiskt granskad
Xu, Y., Bader, S., Magno, M., Mayer, P. & Oelmann, B. (2019). Energy-autonomous On-rotor RPM Sensor Using Variable Reluctance Energy Harvesting. In: 2019 IEEE 8th International Workshop on Advances in Sensors and Interfaces (IWASI): . Paper presented at 2019 IEEE 8th International Workshop on Advances in Sensors and Interfaces (IWASI), Otranto, Italy, 13-14 June, 2019 (pp. 175-180). IEEE, Article ID 08791251.
Öppna denna publikation i ny flik eller fönster >>Energy-autonomous On-rotor RPM Sensor Using Variable Reluctance Energy Harvesting
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2019 (Engelska)Ingår i: 2019 IEEE 8th International Workshop on Advances in Sensors and Interfaces (IWASI), IEEE, 2019, s. 175-180, artikel-id 08791251Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Energy-autonomous wireless sensor systems have the potential to enable condition monitoring without the need for a wired electrical infrastructure or capacity-limited batteries. In this paper, a robust and low-cost energy-autonomous wireless rotational speed sensor is presented, which harvests energy from the rotary motion of its host using the variable reluctance principle. A microelectromechanical system (MEMS) gyroscope is utilized for angular velocity measurements, and a Bluetooth Low Energy System-on-Chip (SoC) transmits the acquired samples wirelessly. An analysis on the individual subsystems is performed, investigating the output of the energy transducer, the required energy by the load, and energy losses in the whole system. The results of simulations and experimental measurements on a prototype implementation show that the system achieves energy-autonomous operation with sample rates between 1 to 50 Hz already at 10 to 40 rotations per minute. Detailed investigations of the system modules identify the power management having the largest potential for further improvements.

Ort, förlag, år, upplaga, sidor
IEEE, 2019
Nyckelord
Transducers, Energy harvesting, Wireless sensor networks, Sensor systems, Velocity control, Wireless communication, Wheels
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
urn:nbn:se:miun:diva-36839 (URN)10.1109/IWASI.2019.8791251 (DOI)000502733100040 ()2-s2.0-85071415267 (Scopus ID)978-1-7281-0557-4 (ISBN)978-1-7281-0558-1 (ISBN)
Konferens
2019 IEEE 8th International Workshop on Advances in Sensors and Interfaces (IWASI), Otranto, Italy, 13-14 June, 2019
Projekt
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Forskningsfinansiär
KK-stiftelsen, ASIS 20140323Vinnova, 2017-03725
Tillgänglig från: 2019-08-13 Skapad: 2019-08-13 Senast uppdaterad: 2020-01-29Bibliografiskt granskad
Xu, Y., Bader, S. & Oelmann, B. (2018). A Survey on Variable Reluctance Energy Harvesters in Low-Speed Rotating Applications. IEEE Sensors Journal, 18(8), 3426-3435
Öppna denna publikation i ny flik eller fönster >>A Survey on Variable Reluctance Energy Harvesters in Low-Speed Rotating Applications
2018 (Engelska)Ingår i: IEEE Sensors Journal, ISSN 1530-437X, E-ISSN 1558-1748, Vol. 18, nr 8, s. 3426-3435Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Energy harvesting converts ambient energy to electrical energy that can be used to power, for example, sensors and sensor systems. Variable reluctance energy harvesting is a suitable candidate for the conversion of rotary kinetic motion, an energy form commonly found in industrial applications. The implementation of a variable reluctance energy harvester, however, has a significant effect on its performance and is not well studied. In this paper, we therefore conduct a survey on different structures of variable reluctance energy harvesters. Six existing structures, previously used in variable reluctance sensors, are presented and analyzed according to their approaches for magnetic flux change improvement. Together with a newly proposed structure, these structures are evaluated based on a finite element analysis, and their results are compared. It is demonstrated that the choice of structure considerably affects the power output of the harvester and is dependent on the improvement approaches the structure utilizes. The newly proposed structure outperforms all existing structures with respect to power output and power density, which comes at a cost of higher parasitic torque generation. A 53-fold power improvement over the reference and an 1.2-fold power improvement over the next best structure is observed. As a result, applications of variable reluctance energy harvesting become viable even at low angular velocities.

Nyckelord
Energy harvesting, sensor systems, finite element analysis, electromagnetic induction, magnetic flux
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
urn:nbn:se:miun:diva-33263 (URN)10.1109/JSEN.2018.2808377 (DOI)000428585900039 ()2-s2.0-85042350692 (Scopus ID)
Projekt
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Tillgänglig från: 2018-03-14 Skapad: 2018-03-14 Senast uppdaterad: 2020-01-29Bibliografiskt granskad
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