Change search
ReferencesLink to record
Permanent link

Direct link
Konstruktion av säkerhetslagerför svänghjul
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
2015 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
Design of backup-bearing for flywheel usage (English)
Abstract [en]

This thesis is the result of the investigation and solution of a mechanicalproblem regarding flywheel malfunctions. A flywheel is, in short, a devicethat relies on a rotating object’s moment of inertia to store energy overshort time spans. This project is part of the development of a fourthflywheel prototype at the division for electricity at Uppsala university,which uses magnetic levitation to keep a hollow cylinder rotating at veryhigh speeds inside a vacuum chamber. Should the magnets fail however, orsome other error occur that leads to an uncontrolled state of rotation, thecylinder needs to be stabilized mechanically by a device usually referredto as ‘back-up bearing’. This contraption might, like an airbag of a car,never be used but needs to be included if an emergency occurs to protectother parts of the flywheel which would otherwise be destroyed by theunrestrained rotor.

A theoretical pre-study was conducted to determine what challenges andrespective solutions the design of such a device would encounter, forexample the amount of energy in the rotor and possible ways to dissipate itin the event of a malfunction. The benefits and downsides of materials andmachine elements such as bearings were investigated in order to design aset of backup bearings. The modelling was done using SolidWorks, which wasalso used to conduct thermal and mechanical simulations on differentconcepts. MatLab was used for calculations, using formulae from themanufacturers and from different websites.

The project concluded that the sheer energy of the flywheel at top speedpresents considerable thermodynamic difficulties. A solution capable ofhandling this was however achieved, albeit barely. Unfortunately onlysimulations and calculations confirm this result as no practicalexperiments could be conducted, therefore caution is advised in futureexperiments where the flywheel speed approaches maximum levels.

Place, publisher, year, edition, pages
2015. , 59 p.
Keyword [en]
Mechanical design, CAD, FEM simulation, flywheel, rotational energy
Keyword [sv]
Konstruktion, CAD, FEM, simulation, svänghjul, rotationsenergi
National Category
Mechanical Engineering
URN: urn:nbn:se:uu:diva-254655ISRN: UTH-INGUTB-EX-M-2015/11-SEOAI: diva2:819276
Educational program
Bachelor Programme in Mechanical Engineering
Available from: 2015-06-10 Created: 2015-06-10 Last updated: 2015-06-10Bibliographically approved

Open Access in DiVA

fulltext(7752 kB)153 downloads
File information
File name FULLTEXT01.pdfFile size 7752 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Department of Engineering Sciences
Mechanical Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 153 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 538 hits
ReferencesLink to record
Permanent link

Direct link