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Some Physical Aspects of a Small Vertical Axis Wind Turbine Suspended by Magnetic Levitation
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

With the heightening concerns toward climate change and global warming, interest in renewable

energy sources has increased. Among these energy sources, wind power has experienced high

levels of growth in recent years. Accordingly, domestic-sized wind turbines have also been

attracting a good deal of social attention as a part of a micro-generation system.

Among several types of wind turbines, magnetically levitated vertical axis wind turbines have

many advantages over conventional wind turbines, making them suitable for residential


In this study several magnetic levitation sections have been investigated on four criteria: (1) axial

stiffness; (2) radial stiffness; (3) stiffness against vibration; and (4) ease of manufacture, by using

the finite element method (FEM) simulation tool in order to decide the design of a new magnetic

levitation section.

Furthermore, ferrofluid-sealed magnetic bearings have also been studied with the FEM

simulation tool to use them as a method to compensate the negative radial stiffness of the new

magnetic levitation section.

Based on these simulation results, a test model has been manufactured and then experimentally

evaluated. It has been confirmed by the evaluations that the stability of the wind turbine designed

in this study is dramatically increased by using the ferrofluid-sealed magnetic bearings with the

new magnetic levitation section.

Place, publisher, year, edition, pages
2014. , 120 p.
EES Examensarbete / Master Thesis, XR-EE-ETK 2014:006
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-153643OAI: diva2:757445
Available from: 2014-11-05 Created: 2014-10-06 Last updated: 2014-11-26Bibliographically approved

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