Reluctance Machine for a Hollow Cylinder Flywheel

Magnus Hedlund, Tobias Kamf, Juan De Santiago, Johan Abrahamsson and Hans Bernhoff
Additional contact information
Magnus Hedlund: Division for Electricity, Uppsala University, Lägerhyddsvägen 1, 75237 Uppsala, Sweden
Tobias Kamf: Division for Electricity, Uppsala University, Lägerhyddsvägen 1, 75237 Uppsala, Sweden
Juan De Santiago: Division for Electricity, Uppsala University, Lägerhyddsvägen 1, 75237 Uppsala, Sweden
Johan Abrahamsson: Division for Electricity, Uppsala University, Lägerhyddsvägen 1, 75237 Uppsala, Sweden
Hans Bernhoff: Division for Electricity, Uppsala University, Lägerhyddsvägen 1, 75237 Uppsala, Sweden

Energies, 2017, vol. 10, issue 3, 1-18

Abstract: A hollow cylinder flywheel rotor with a novel outer rotor switched reluctance machine (SRM) mounted on the interior rim is presented, with measurements, numerical analysis and analytical models. Practical experiences from the construction process are also discussed. The flywheel rotor does not have a shaft and spokes and is predicted to store 181 Wh / kg at ultimate tensile strength (UTS) according to simulations. The novel SRM is an axial flux machine, chosen due to its robustness and tolerance for high strain. The computed maximum tip speed of the motor at UTS is 1050 m / s . A small-scale proof-of-concept electric machine prototype has been constructed, and the machine inductance has been estimated from measurements of voltage and current and compared against results from analytical models and finite element analysis (FEA). The prototype measurements were used to simulate operation during maximal speed for a comparison towards other high-speed electric machines, in terms of tip speed and power. The mechanical design of the flywheel was performed with an analytical formulation assuming planar stress in concentric shells of orthotropic (unidirectionally circumferentially wound) carbon composites. The analytical approach was verified with 3D FEA in terms of stress and strain.

Keywords: flywheel energy storage (FES); hollow cylinder flywheel; reluctance machine; high-speed machines (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
https://www.mdpi.com/1996-1073/10/3/316/pdf (application/pdf)
https://www.mdpi.com/1996-1073/10/3/316/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:10:y:2017:i:3:p:316-:d:92379

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().