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Rotor design for PM generators reflecting the unstable neodymium price
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
2012 (English)In: Electrical Machines (ICEM), 2012 XXth International Conference, 2012, 1419-1423 p.Conference paper (Refereed)
Abstract [en]

The price of rare earth metals such as neodymium is very unstable and has in recent years increased more than 1000%. This leaves the wind power business that uses permanent magnet generators with large insecurity. In this paper, a generator design with an interchangeable rotor is presented, which gives the option of having a rotor with different material depending on the current neodymium price. Thereby, the wind turbine has the same properties with only the generator rotor changing. The suggested alternative, a ferrite rotor, is much heavier than a neodymium rotor. The heavy ferrite rotor indicates an advantage for the vertical axis wind turbine technology with the generator placed on ground level, where the weight is not as important as in the hub. Two similar generator designs are presented, magnet material differences are discussed and the neodymium price limit for when the ferrite rotor is to be preferred is calculated.

Place, publisher, year, edition, pages
2012. 1419-1423 p.
Keyword [en]
Ferrites, Generators, Magnetic flux, Neodymium, Rotors, Wind turbines, boron alloys, iron alloys, magnetic materials, neodymium alloys, permanent magnet generators, power generation economics, NdFeB, generator design, generator rotor, interchangeable rotor, neodymium rotor, permanent magnet generator, rare earth metal price, rotor design, wind power plants, wind turbine, Costs, Permanent magnet machines, Rare earth metals, Simulation, Wind energy
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
URN: urn:nbn:se:uu:diva-190194DOI: 10.1109/ICElMach.2012.6350064ISBN: 978-1-4673-0143-5ISBN: 978-1-4673-0141-1OAI: diva2:583111
XXth International Conference on Electrical Machines (ICEM), 2-5 Sept, 2012, Marseille, FRANCE
Available from: 2013-01-07 Created: 2013-01-07 Last updated: 2013-03-04Bibliographically approved

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