Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE credits
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
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.
2014. , 120 p.