Effect of Rare-Earth Dopant on Coercivity of Hot-Pressed Nd–Fe–B Magnet Doped With RF<sub>3</sub>

Kim, J. Y.; Kwon, Hansang; Lee, J. G.; Yu, Juan

doi:10.1109/tmag.2015.2448094

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…Doping of NdFeB magnets with RE material such as Cerium (Ce), Lanthanum (La) and Praseodymium (Pr) have been investigated in the past. For example, Kim et al [59] investigate different ratios of multiple RE Trifluorides with NeFeB melt-spun flakes. The coercive force (Hci) that represent the magnet's resistance to demagnetization is found to substantially deteriorate in order: DyF 3 , NdF 3 , PrF 3 , LaF 3 and lowest with CeF 3 .…”

Section: A Employing Non-critical Rare-earth Materials Such As Cerium For Doping Of Ndfebmentioning

confidence: 99%

A Review on Variable Flux Machine Technology: Topologies, Control Strategies and Magnetic Materials

2019

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Modern applications demand challenging operation requirements from electrical machines. Variable-flux machine (VFM) concepts are found to offer new opportunities for improved machine design. This paper reviews the VFM technology. Three topologies, mainly the parallel hybrid VFMs, series hybrid VFMs, and variable-flux flux intensifying type VFMs are discussed in detail. The variable-flux flux Intensifying machines are found to be the state-of-the-art VFM technology available to-date. The paper also reviews the magnetization process in the VFMs and relates this with the B-H curve of the magnetic material. The conventional PM machine mathematical model is adapted to represent the operation of the VFMs. The different operational limitations of the VFMs are explained and the different modes of operation of the VFMs have been reviewed and compared. The magnetization state manipulation techniques are reviewed. The AC magnetization is found to be the more preferable approach to reduce weight and manufacturing complexity of the VFMs. The trapezoidal current pulse based approach is popular in AC magnetization state manipulation, however, new advanced forms of current vector trajectory control techniques offer comparatively better magnetic state manipulation and higher speed capability for remagnetization of the magnets in the VFMs. The paper also reviews the different magnetization state estimation techniques that are useful during control systems development for the VFMs. The magnetic material for the VFM design is reviewed and potential alternative magnetic material that can satisfy the requirements of the VFMs have been identified. Finally, the current status, challenges, and the potential of VFMs technology are discussed in the conclusion of the paper.INDEX TERMS Variable flux machines, wide speed range, permanent magnet machines, field weakening, magnetic material, magnetization, demagnetization, machine design.

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Section: A Employing Non-critical Rare-earth Materials Such As Cerium For Doping Of Ndfebmentioning

confidence: 99%

A Review on Variable Flux Machine Technology: Topologies, Control Strategies and Magnetic Materials

2019

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Feasibility study of electrophoresis deposition of DyF3 on Nd-Fe-B particles for coercivity enhancement

et al. 2017

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Feasibility of the electrophoresis deposition (EPD) technique for homogeneous and adhesive deposition of DyF3 particles on the Nd-Fe-B-type particles was studied, and coercivity enhancement in the diffusion-treated Nd-Fe-B-type particles deposited with DyF3 by EPD was investigated. HDDR-treated Nd12.5Fe80.6B6.4Ga0.3Nb0.2 particles were deposited with DyF3 particles by EPD. More homogeneous and adhesive deposition of DyF3 particles on the surface of Nd-Fe-B particles was made by the EPD with respect to conventional dip-coating, and this led to more active and homogeneous diffusion of Dy. More profound coercivity enhancement was achieved in the diffusion-treated Nd-Fe-B-type particles deposited with DyF3 by EPD compared to dip-coated particles.

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Improvement of Magnetic Performance of Nd–Fe–B-Type Die-Upset Magnet by RF₃-Doping

et al. 2016

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Effect of Rare-Earth Dopant on Coercivity of Hot-Pressed Nd–Fe–B Magnet Doped With RF₃

Cited by 3 publications

References 16 publications

A Review on Variable Flux Machine Technology: Topologies, Control Strategies and Magnetic Materials

A Review on Variable Flux Machine Technology: Topologies, Control Strategies and Magnetic Materials

Feasibility study of electrophoresis deposition of DyF3 on Nd-Fe-B particles for coercivity enhancement

Improvement of Magnetic Performance of Nd–Fe–B-Type Die-Upset Magnet by RF₃-Doping

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Effect of Rare-Earth Dopant on Coercivity of Hot-Pressed Nd–Fe–B Magnet Doped With RF3

Cited by 3 publications

References 16 publications

A Review on Variable Flux Machine Technology: Topologies, Control Strategies and Magnetic Materials

A Review on Variable Flux Machine Technology: Topologies, Control Strategies and Magnetic Materials

Feasibility study of electrophoresis deposition of DyF3 on Nd-Fe-B particles for coercivity enhancement

Improvement of Magnetic Performance of Nd–Fe–B-Type Die-Upset Magnet by RF3-Doping

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Effect of Rare-Earth Dopant on Coercivity of Hot-Pressed Nd–Fe–B Magnet Doped With RF₃

Improvement of Magnetic Performance of Nd–Fe–B-Type Die-Upset Magnet by RF₃-Doping