Relevant bibliographies by topics / Alnicos

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Alnicos'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Alnicos"

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Feng, Tong, Wenlu Chen, Jinji Qiu, and Shuanghui Hao. "A New Kind of Absolute Magnetic Encoder." Sensors 21, no. 9 (April 29, 2021): 3095. http://dx.doi.org/10.3390/s21093095.

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To fulfill the requirement of fields such as robotics, aviation, and special machining, motors with quill shafts or outer rotors have been used. For these special motors, the photoelectric encoder’s volume is normally too big and easy to be polluted by oil or dust; magnetic encoder normally has poor accuracy, and alnico piece may not provide enough magnetic field coverage area. The aim of this essay is to find a new structure of magnetic encoder to improve the precision and magnetic field coverage area. By using two multi-pole alnico rings with a different number of pole pairs to provide a magnetic field, the coverage area could be improved. The position differences between two alnicos pole positions are used to calculate absolute angle value, so the accuracy of the encoder could be absolute and no less than that of a combined magnetic encoder with the same number of pole pairs. A special algorithm is proposed for decoding. This new kind of magnetic encoder could be used on special motors with quill shafts or outer rotors. Its volume and weight are less than the photoelectric encoder and have better performance on antipollution. The alnico ring is easy to modify to suit the structure of the motor.
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Skomski, Ralph, Liqin Ke, Matthew J. Kramer, Iver E. Anderson, C. Z. Wang, W. Y. Zhang, Jeff E. Shield, and D. J. Sellmyer. "Cooperative and noncooperative magnetization reversal in alnicos." AIP Advances 7, no. 5 (May 2017): 056222. http://dx.doi.org/10.1063/1.4976216.

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Su, Xiang Jun, and Guan Qi Guo. "Alnic Measuring System for Rail Type Vehicles." Applied Mechanics and Materials 241-244 (December 2012): 2023–27. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.2023.

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This paper designed an implement scheme of the alnic automatic measuring system for rail type vehicles. The system can read information of rail type vehicles by adopting four alnics, through the PLC to achieve the vehicles’s direction measuring and vehicles counting and axle counting and velocity measuring. In order to improve system reliability, comprehensive application of the anti-jamming alnic, software fault-tolerant variety of anti-jamming measure. By setting the calibration alnic, the system effectively overcome the interference of a variety of human factors. By cleverly setting registers N1N1N3 and in accordance with the principle of FIFO N1N2N3 pass assignment, software design is simplified. This system is widely used in modern logistics production and transportation management process of large and medium-sized enterprises involving the train transportation embedded in information management control system or warehouse management control system with high precision, stable and reliable performance, the low product cost.
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White, Emma, Emily Rinko, Timothy Prost, Timothy Horn, Christopher Ledford, Christopher Rock, and Iver Anderson. "Processing of Alnico Magnets by Additive Manufacturing." Applied Sciences 9, no. 22 (November 12, 2019): 4843. http://dx.doi.org/10.3390/app9224843.

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Permanent magnets without rare earth (RE) elements, such as alnico, will improve supply stability and potentially decrease permanent magnet cost, especially for traction drive motors and other increased temperature applications. Commercial alnico magnets with the highest energy product are produced by directional solidification (DS) to achieve a <001> columnar grain orientation followed by significant final machining, adding to the high cost. Additive manufacturing (AM) is an effective method to process near net-shape parts with minimal final machining of complex geometries. AM also, has potential for texture/grain orientation control and compositionally graded structures. This report describes fabrication of alnico magnets by AM using both laser engineered net shaping (LENS)/directed energy deposition (DED) and electron beam melting powder bed fusion (EBM/PBF). High pressure gas atomized (HPGA) pre-alloyed alnico powders, with high purity and sphericity, were built into cylindrical and rectangular samples, followed by magnetic annealing (MA) and a full heat treatment (FHT). The magnetic properties of these AM processed specimens were different from their cast and sintered counterparts of the same composition and show a great sensitivity to heat treatment. The AM process parameters used in this developmental study did not yet result in any preferred texture within the alnico AM builds. These findings demonstrate feasibility for near net-shape processing of alnico permanent magnets for use in next generation traction drive motors and other applications requiring increased operating temperatures and/or complex engineered part geometries, especially with further AM process development for texture control.
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de Campos, Marcos Flavio. "Shape Anisotropy as Coercivity Mechanism." Materials Science Forum 869 (August 2016): 591–95. http://dx.doi.org/10.4028/www.scientific.net/msf.869.591.

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The Alnico magnets (also called Ticonal) have coercivity attributed to shape anisotropy. The conditions for appearing this type of anisotropy are discussed, and the principal is the existence of elongated grains parallel to the easy magnetization axis. A very important detail is that the conditions assumed in the Stoner Wohlfarth model have to be obeyed. The assumptions are i) ferromagnetic phase with single domain particle size and ii) grains without magnetic interaction between them, magnetically insulated by a grain boundary paramagnetic phase. In Alnico magnets, the coercivity mechanism is coherent rotation of single domain size particles.
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Hetherington, M. G., A. Cerezo, J. P. Jakubovics, and G. D. W. Smith. "Microstructure and domain studies in Alnico 5 and Alnico 7 (abstract)." Journal of Applied Physics 57, no. 8 (April 15, 1985): 4173. http://dx.doi.org/10.1063/1.334654.

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Journal, Baghdad Science. "Study of the electrical properties of Ion Beam Sputtered thin AlNiCo films." Baghdad Science Journal 4, no. 2 (June 3, 2007): 260–62. http://dx.doi.org/10.21123/bsj.4.2.260-262.

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Shao, Bin, Bing Bing Li, Chun Hong Li, Yi Long Ma, Qiang Zheng, Dong Ling Guo, Deng Ming Chen, and Jian Chun Sun. "Microstructure and Distribution of Low Content Elements in AlNiCo 9." Materials Science Forum 898 (June 2017): 1669–74. http://dx.doi.org/10.4028/www.scientific.net/msf.898.1669.

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The microstructure and the chemistry distribution of AlNiCo 9 samples were characterized by the X-ray diffraction, magnetic force microscope, field emission scanning electron microscopy and transmission electron microscope. An interface of a high Al content was formed near the FeCo-rich phases with a size of about 30 nm. S elements mainly combined with Ti to form titanium sulfide bars with the length between 70-150 μm, while S elements was not confirmed in the nanostructured FeCo-rich phase and AlNi-rich phase. Si and Nb preferably existed in the NiAl-rich phase, and a higher content Nb near the Cu precipitate boundary was observed. Moreover, the magnetic domain structure of AlNiCo 9 was also studied.
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Ke, Liqin, Ralph Skomski, Todd D. Hoffmann, Lin Zhou, Wei Tang, Duane D. Johnson, Matthew J. Kramer, Iver E. Anderson, and C. Z. Wang. "Simulation of alnico coercivity." Applied Physics Letters 111, no. 2 (July 10, 2017): 022403. http://dx.doi.org/10.1063/1.4992787.

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Wilkinson, H. T. "Association of Trechispora alnicola with yellow ring disease of Poa pratensis." Canadian Journal of Botany 65, no. 1 (January 1, 1987): 150–53. http://dx.doi.org/10.1139/b87-021.

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Trechispora alnicola (Bourd. & Galz.) Liberia was associated with Poa pratensis L. roots and in the thatch layer of blue-grass sod. These plants had yellowed leaves. On thatch and culture medium, the fungus isolated from diseased plants produced hyaline mycelium typical of T. alnicola, and crystalline material. Conidia produced on thatch or on culture medium germinated by the production of a single germ tube. Basidia from basidiomata produced in nature were arranged in an effused manner; basidiospores were echinulate. This is the first report of T. alnicola associated with a member of the Graminae.
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Dissertations / Theses on the topic "Alnicos"

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Lopez, Gomez Partida Fausto. "Design of a Permanent Magnet Synchronous Generator with Alnico Magnets." Thesis, Uppsala universitet, Elektricitetslära, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-395215.

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Following the trends to diminish the fossil fuel energy production new technologies known for their renewable sources have become a signficant option for helping combat climate change and handle the current oil prices. These new technologies base their power production on already established physical principles that convert mechanical power to electrical power. Generators are the fundamental piece of machinery for electricity production. Among the various types of generators that exist, permanent magnet synchronous generators (PMSGs) are commonly used for renewable electricity production. At present, the most used magnets for PMSGs are alloys of neodymium, iron, and boron which form a tetragonal crystalline structure known as Neodymium magnets (NdFeB). These types of magnets contain rare-earth materials, which makes them highly non-sustainable materials. Research to find new magnet compositions to substitute rare earth magnets or to reduce the weight and increase the efficiency of PMSGs is currently being studied. One option is to use Alnico magnets. This thesis project explores this option. With the help of a finite element analysis (FEA) software (COMSOL Multiphysics), three types of Alnico grades 5, 8 and 9 were implemented in the rotor of a spoke type generator to study the load limits of the rotor magnets, and together with this observe the demagnetization and impact that it has on the power production of the generator, in two different scenarios: 1) When the generator is connected to a nominal load under normal conditions and 2) when the generator is connected to a nominal load after a short circuit (SC). The simulations provided an insight into the load limitations that the generator has by each type of Alnico studied. Alnico 9 showed to be the best candidate magnet from the three magnets implemented with less demagnetization and higher electrical power output, followed by Alnico 8, which presented a good electrical power output at the nominal load scenario. Regardless of the higher demagnetization of Alnico 5, it proved to be a better candidate than Alnico 8 at the SC scenario.
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Harper, Heather McRae. "A molecular-dynamics study of the frictional anisotropy on the 2-fold surface of a d-AlNiCo quasicrystalline approximant." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002776.

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Jha, Rajesh. "Combined Computational-Experimental Design of High-Temperature, High-Intensity Permanent Magnetic Alloys with Minimal Addition of Rare-Earth Elements." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2621.

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AlNiCo magnets are known for high-temperature stability and superior corrosion resistance and have been widely used for various applications. Reported magnetic energy density ((BH) max) for these magnets is around 10 MGOe. Theoretical calculations show that ((BH) max) of 20 MGOe is achievable which will be helpful in covering the gap between AlNiCo and Rare-Earth Elements (REE) based magnets. An extended family of AlNiCo alloys was studied in this dissertation that consists of eight elements, and hence it is important to determine composition-property relationship between each of the alloying elements and their influence on the bulk properties. In the present research, we proposed a novel approach to efficiently use a set of computational tools based on several concepts of artificial intelligence to address a complex problem of design and optimization of high temperature REE-free magnetic alloys. A multi-dimensional random number generation algorithm was used to generate the initial set of chemical concentrations. These alloys were then examined for phase equilibria and associated magnetic properties as a screening tool to form the initial set of alloy. These alloys were manufactured and tested for desired properties. These properties were fitted with a set of multi-dimensional response surfaces and the most accurate meta-models were chosen for prediction. These properties were simultaneously extremized by utilizing a set of multi-objective optimization algorithm. This provided a set of concentrations of each of the alloying elements for optimized properties. A few of the best predicted Pareto-optimal alloy compositions were then manufactured and tested to evaluate the predicted properties. These alloys were then added to the existing data set and used to improve the accuracy of meta-models. The multi-objective optimizer then used the new meta-models to find a new set of improved Pareto-optimized chemical concentrations. This design cycle was repeated twelve times in this work. Several of these Pareto-optimized alloys outperformed most of the candidate alloys on most of the objectives. Unsupervised learning methods such as Principal Component Analysis (PCA) and Heirarchical Cluster Analysis (HCA) were used to discover various patterns within the dataset. This proves the efficacy of the combined meta-modeling and experimental approach in design optimization of magnetic alloys.
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Mohseni, Farzin. "Nanostructured rare-earth free permanent magnets." Doctoral thesis, 2021. http://hdl.handle.net/10773/31064.

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In this work we explore on the rare-earth free nanostructured permanent magnets, including thin films, nanoparticles and nanocomposites with the focus on Alnico magnets and hexaferrites. Here we investigate the effects of different heat treatment conditions on structural and magnetic properties of RFsputtered Alnico V thin films on Si substrates. We show an in-depth analysis of the various heat treated samples with high coercivity to unveil the origin of high coercivity in these thin films with a recently discovered Fe-Co rich Body- Centered Tetragonal (bct) phase. Exchange-spring magnets are also explored, namely barium hexaferrite (BaM) and strontium hexaferrite (SrM). We investigate on the possibility of coating BaM and SrM flake-like hexaferrite particles via a hydrothermal and coprecipitation method to prepare core-shelllike BaM/Fe3O4 and SrM/Fe3O4 nanocomposites, where the ferrite particles where prepared via a sol-gel auto-combustion method. We show how optimised hard to soft magnetic phase ratio and preparation conditions lead to a significant enhancement in their hard magnetic properties compared to commercial ferrite powders. Moreover, we employ the prepared highperformance exchange-coupled nanocomposite powder and investigate the mechanical and magnetic properties of warm compressed nanocomposite powder in an epoxy matrix. We show how the powder-to-resin ratio and preparation conditions lead to optimised mechanical properties, and enhancement in the maximum energy product of the composite magnet. Finally, micromagnetic simulations were employed to better understand and support the experimental results of the exchange coupling behaviour of the BaM/Fe3O4 hard-soft magnetic nanocomposites. We show how the thickness of BaM particles affect their coercivity and how the volume fraction of each magnetic phase, together with their interface area, affect the exchange coupling behaviour and maximum energy product of the nanocomposite magnets.
Neste trabalho, exploramos magnetes permanentes nano-estruturados, livres de terras raras, incluíndo filmes finos, nanopartículas e nanocompósitos focando magnetes de Alnico e hexaferrites. Investigamos os efeitos de diferentes condições de tratamento térmico nas propriedades estruturais e magnéticas de filmes finos de Alnico V pulverizados por RF em substratos de Si. Fizemos uma análise mais aprofundada das várias amostras tratadas termicamente para desvendar a origem da alta coercividade nesses filmes finos com uma recentemente descoberta fase Tetragonal Centrada no Corpo (bct) rica em Fe-Co. Os magnetes exchange-spring também são explorados, e.g. hexaferrite de bário (BaM) e hexaferrite de estrôncio (SrM). Investigamos a possibilidade de revestir partículas de hexaferrite semelhantes a flocos de BaM e SrM por meio de métodos hidrotérmico e de coprecipitação para preparar nanocompósitos tipo núcleo-casca de BaM/Fe3O4 e SrM/Fe3O4, onde as partículas de ferrite foram preparadas por meio de método sol-gel de combustão. Mostramos como a relação de fases magnéticas macia e dura, mais as condições de preparação otimizadas, levam a um aprimoramento significativo das suas propriedades magnéticas duras em comparação com pós de ferrite comerciais. Além disso, usando o pó de nanocompósito de alto desempenho, investigamos as propriedades mecânicas e magnéticas do pó do nanocompósito comprimido a quente em uma matriz de epóxi. Mostramos como a combinação pó-resina e as condições de preparação levam à obtenção de propriedades mecânicas otimizadas e a um aprimoramento do produto de energia máxima do magnete composto. Finalmente, realizamos simulações micromagnéticas para melhor compreender e apoiar os resultados experimentais do comportamento de acoplamento de troca dos nanocompósitos magnéticos duros-macios de BaM/Fe3O4. Mostramos como a espessura das partículas BaM afetam a coercividade e como a fração de volume de cada fase magnética, assim como a área de interface entre elas, afetam o comportamento de acoplamento de troca bem como o produto energético máximo dos magnetes de nanocompósitos.
Programa Doutoral em Ciência e Engenharia de Materiais
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Books on the topic "Alnicos"

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Hughes, Kathryn Morven. Characterisation of spinodal microstructure in Alnico alloys. Birmingham: University of Birmingham, 1999.

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Tīfentāle, Alise. Alnis Stakle. Rīga: Neputns, 2009.

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Book chapters on the topic "Alnicos"

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Warlimont, H. "Hard magnetic materials: Alnico." In Powder Metallurgy Data, 592–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/10689123_31.

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Griesche, A., F. Garcia-Moreno, M. P. Macht, and Günter Frohberg. "Chemical Diffusion Experiments in AlNiCe-Melts." In Materials Science Forum, 567–72. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-991-1.567.

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Buschow, K. H. J. "Alnicos and Hexaferrites." In Encyclopedia of Materials: Science and Technology, 85–89. Elsevier, 2001. http://dx.doi.org/10.1016/b0-08-043152-6/00016-4.

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White, Emma M., Aaron G. Kassen, Iver E. Anderson, and Steve Constantinides. "Techniques of Powder Processing Alnico Magnets." In Manufacturing Techniques for Materials, 611–35. CRC Press, 2018. http://dx.doi.org/10.1201/b22313-19.

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Conference papers on the topic "Alnicos"

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Dai, Yinzhen, Wei Zhang, Shuxia Guo, Jiancheng Zhang, and Lei Wang. "Alnico sheet measurement based on machine vision." In 2013 International Conference on Anti-Counterfeiting, Security and Identification (ASID). IEEE, 2013. http://dx.doi.org/10.1109/icasid.2013.6825315.

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Maroufian, Seyede Sara, and Pragasen Pillay. "PM assisted synchronous reluctance machine design using AlNiCo magnets." In 2017 IEEE International Electric Machines and Drives Conference (IEMDC). IEEE, 2017. http://dx.doi.org/10.1109/iemdc.2017.8002163.

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Zhao, J. T., Y. L. Sun, Z. Liu, D. Lee, L. Liu, X. C. Feng, and A. R. Yan. "Effect of Phase Structure on Remanence Thermal Stability of Alnico8 Alloys." In 2016 International Conference of Asian Union of Magnetics Societies (ICAUMS). IEEE, 2016. http://dx.doi.org/10.1109/icaums.2016.8479659.

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Masisi, Lesedi, Maged Ibrahim, and Pragasen Pillay. "Control strategy of a variable flux machine using AlNiCo permanent magnets." In 2015 IEEE Energy Conversion Congress and Exposition. IEEE, 2015. http://dx.doi.org/10.1109/ecce.2015.7310398.

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Ibrahim, Maged, and Pragasen Pillay. "Design of high torque density variable flux permanent magnet machine using Alnico magnets." In 2014 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2014. http://dx.doi.org/10.1109/ecce.2014.6953881.

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Yang, Gongde, Yangzhong Zhou, and Mingyao Lin. "Variable Magnet Analysis of the Series Hybrid Permanent Magnet Magnetic Circuit with AlNiCo." In 2020 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD). IEEE, 2020. http://dx.doi.org/10.1109/asemd49065.2020.9276147.

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Tang, W., L. Zhou, A. Kassen, A. Palasyuk, E. White, K. W. Dennis, M. J. Kramer, R. W. Mccallum, and I. E. Anderson. "New alnico magnets fabricated from pre-alloyed gas atomization powder through diverse consolidation techniques." In 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7156514.

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Takbash, Amirmasoud, and Pragasen Pillay. "Design optimization of a new spoke type variable-flux motor using AlNiCo permanent-magnet." In 2017 IEEE International Electric Machines and Drives Conference (IEMDC). IEEE, 2017. http://dx.doi.org/10.1109/iemdc.2017.8002205.

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Thike, Rajendra, and Pragasen Pillay. "Parameter Measurements and Modeling of a Novel Hybrid Variable Flux Machine with Series Rare-Earth and AlNiCo Magnets." In 2020 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2020. http://dx.doi.org/10.1109/ecce44975.2020.9235628.

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Peng, Peng, and Julia Zhang. "Design of a Variable-Flux Permanent Magnet Machine using Alnico 9 and Comparison with a Baseline Interior Permanent Magnet Machine." In 2019 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2019. http://dx.doi.org/10.1109/ecce.2019.8912304.

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Reports on the topic "Alnicos"

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Samuel, Cortez. Investigation of the alpha-sub-gamma phase in alnico 6. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.1472.

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Anderson, Iver. Manufacturing of Advanced Alnico Magnets for Energy Efficient Traction Drive Motors CRADA Final Report. Office of Scientific and Technical Information (OSTI), November 2019. http://dx.doi.org/10.2172/1574906.

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Kassen, Aaron Gregory. Exploration of Alnico Permanent Magnet Microstructure and Processing for Near Final Shape Magnets with Solid-State Grain Alignment for Improved Properties. Office of Scientific and Technical Information (OSTI), June 2018. http://dx.doi.org/10.2172/1593366.

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