uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
The Influence of PM Material Properties on Choice of Generator Magnetic Circuit Topology
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. (Wind power group)ORCID iD: 0000-0003-3341-6910
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. (Wind power group)
2016 (English)Manuscript (preprint) (Other academic)
Place, publisher, year, edition, pages
2016.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
URN: urn:nbn:se:uu:diva-292965OAI: oai:DiVA.org:uu-292965DiVA: diva2:928700
Funder
Swedish Research Council, 2012-4706
Available from: 2016-05-16 Created: 2016-05-11 Last updated: 2016-07-07
In thesis
1. Rare Earth Metal–Free Permanent Magnet Generators
Open this publication in new window or tab >>Rare Earth Metal–Free Permanent Magnet Generators
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Permanent magnet (PM) synchronous generators (SGs) are used in renewable energy production. The preferred PM material is neodymium-iron-boron (NdFeB), which has very high performance and, until recently, low cost. In recent years there has emerged a cost and supply insecurity in NdFeB PMs due to export restrictions imposed by China, where the majority of the raw materials are produced. In this thesis various methods of avoiding the use of PM materials based on NdFeB, or other rare earth metals, are investigated.

One approach is the use of the cheap and abundant ferrite PM. A ferrite PM rotor intended to be interchangeable with an NdFeB PM rotor is designed and built. Some initial investigation of the performance of the new rotor, and how this relates to manufacturing tolerances, is also made.

Another approach is to make parameter studies in anticipation of new PM materials. A study of how three different rotor topologies perform with different PM materials, described by their remanence and recoil permeability, is made. The rotor topologies are: a spoke type PM rotor, a surface mounted PM rotor and a capped PM rotor.

It is concluded that a viable replacement rotor can be designed using ferrite PMs. The new rotor will be heavier and mechanically more complex, and give slightly lower output voltage. Losses in the machine will increase slightly. A study is made on the impact of manufacturing tolerances on the performance of the resulting rotor.

The different rotor topologies work best with different PM material properties. The surface mounted PM and capped PM rotors require higher remanence for good performance; the spoke type PM rotor works well with larger amounts of low remanence material. The recoil permeability should be low for the surface mounted and high for the capped PM rotor.

Place, publisher, year, edition, pages
Uppsala: Uppsala universitet, Institutionen för teknikvetenskaper, 2016. 51 p.
Series
UURIE / Uppsala University, Department of Engineering Sciences, ISSN 0349-8352 ; UURIE 348-16L
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-292963 (URN)
Presentation
2016-06-13, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:15 (English)
Opponent
Supervisors
Funder
Swedish Research Council, 2012-4706ÅForsk (Ångpanneföreningen's Foundation for Research and Development), 12-295
Available from: 2016-07-07 Created: 2016-05-11 Last updated: 2016-07-07Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Eklund, PetterEriksson, Sandra
By organisation
Electricity
Other Electrical Engineering, Electronic Engineering, Information Engineering

Search outside of DiVA

GoogleGoogle Scholar
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: 95 hits
ReferencesLink to record
Permanent link

Direct link