Rare-earth free permanent magnets and permanent magnet synchronous motors

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dc.contributorHaskew, Tim A.
dc.contributorLi, Shuhui
dc.contributorMankey, Gary J.
dc.contributorGupta, Subhadra
dc.contributor.advisorHong, Yang-Ki
dc.contributor.authorPark, Jihoon
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2017-03-01T17:44:33Z
dc.date.available2017-03-01T17:44:33Z
dc.date.issued2016
dc.descriptionElectronic Thesis or Dissertationen_US
dc.description.abstractIn this dissertation, basic and applied research programs are engaged that range from the fundamental magnetism and magnetic properties of ferro- and ferrimagnetic materials to the design and fabrication of rare earth (RE) free permanent and soft magnetic materials for an interior permanent magnet synchronous motor (IPMSM) (i.e., motor for electric vehicles and plug-in electric vehicles) and heat assisted magnetic recording media (HAMR) with 4 Tb/in2 information storage applications. The applied research program emphasizes the design and synthesis of new RE-free permanent magnetic materials and magnetic exchange coupled core(hard)-shell(soft) particles to achieve a high maximum energy product [(BH)max], and the design of an advanced IPMSM based on RE free permanent magnets. The electronic structures of hard magnetic materials such as Mn-Al, Mn-Bi, Mn-Bi-X, Fe-Pt, Fe-Pt-X, SrFe12O19, and SrFe12O19-X (X = transition elements) and soft magnetic materials such as nanocrystalline and Mn-B were calculated based on the density functional theory (DFT), and their exchange coupled magnetic properties with soft magnets were designed according to the size and shape of the particles. The calculated magnetic and electronic properties were used to obtain the temperature dependence of saturation magnetization Ms(T) and anisotropy constant K(T) within the mean field theory. Thereby, the temperature dependence of the maximum energy product [(BH)max(T)] is calculated using the calculated Ms(T) and K(T). The experimental approaches were based on chemical and ceramic processes to synthesize hard and soft magnetic materials. Prior to synthesis, material design parameters were optimized by first-principles calculations and micromagnetic simulations. Lastly, performance of RE-free MnAl, MnBi, SrFe12O19, and Alnico IPMSMs, designed with the finite element method (FEM), at 23 and 200 oC were evaluated and compared to a RE Nd Fe B IPMSM. The performance parameters include torque, efficiency, and power. It was found that the performance of the MnBi and Alnico IPMSM is comparable with the Nd-Fe-B IPMSM.en_US
dc.format.extent184 p.
dc.format.mediumelectronic
dc.format.mimetypeapplication/pdf
dc.identifier.otheru0015_0000001_0002347
dc.identifier.otherPark_alatus_0004D_12813
dc.identifier.urihttps://ir.ua.edu/handle/123456789/2672
dc.languageEnglish
dc.language.isoen_US
dc.publisherUniversity of Alabama Libraries
dc.relation.hasversionborn digital
dc.relation.ispartofThe University of Alabama Electronic Theses and Dissertations
dc.relation.ispartofThe University of Alabama Libraries Digital Collections
dc.rightsAll rights reserved by the author unless otherwise indicated.en_US
dc.subjectMaterials science
dc.subjectElectrical engineering
dc.titleRare-earth free permanent magnets and permanent magnet synchronous motorsen_US
dc.typethesis
dc.typetext
etdms.degree.departmentUniversity of Alabama. Department of Electrical and Computer Engineering
etdms.degree.disciplineElectrical and Computer Engineering
etdms.degree.grantorThe University of Alabama
etdms.degree.leveldoctoral
etdms.degree.namePh.D.
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