Determining demagnetisation risk for two PM wind power generators with different PM material and identical stators
2016 (English)In: IET Electric Power Applications, ISSN 1751-8660, E-ISSN 1751-8679, Vol. 10, no 7, 593-597 p.Article in journal (Refereed) Published
Ways to utilise ferrite permanent magnets (PMs), in a better way has been in focus the last couple of years since the use of neodymium-iron-boron (NdFeB) PMs has been debated. While ferrite PMs offer a low-cost alternative to rare- earth PMs, it is a trade-off for lower energy density. Depending on the type of PM and if the PMs are surface mounted or buried, the risk of demagnetisation during a fault condition can vary significantly between machines. In this study, the demagnetisation risk of two electrically similar generators with identical stators has been studied during several short- circuit faults at different temperatures. The study is simulation-based, and the results show that the generator with the ferrite rotor will suffer from a small but not significant amount of demagnetisation in the worst, three-phase-neutral, short-circuit case at a temperature of 5°C, whereas the NdFeB PMs will suffer from partial demagnetisation if a fault occurs at 120°C. For operational temperatures between 20 and 60°C both generators will sustain a short-circuit event.
Place, publisher, year, edition, pages
2016. Vol. 10, no 7, 593-597 p.
PM, Electrical machines, Demagnetization, Synchronous generators, Wind power, Comsol Multiphysics
Engineering and Technology
Research subject Engineering Science with specialization in Science of Electricity; Engineering Science
IdentifiersURN: urn:nbn:se:uu:diva-291371DOI: 10.1049/iet-epa.2015.0518ISI: 000381407900001OAI: oai:DiVA.org:uu-291371DiVA: diva2:925378
FunderSwedish Research Council, 2010-3950StandUp