The Potential for NdFeB Magnets in Electrical Machines and Other Permanent Magnet Excited Devices

1989 ◽  
pp. 695-707 ◽  
Author(s):  
D Howe ◽  
T S Birch ◽  
K J Mitchell
Keyword(s):  
Permanent Magnet ◽  
Electrical Machines ◽  
Ndfeb Magnets

scholarly journals Magnetic Gears and Magnetically Geared Machines with Reduced Rare-Earth Elements for Vehicle Applications

2021 ◽  
Vol 12 (2) ◽  
pp. 52
Author(s):  
Ali Al-Qarni ◽  
Ayman EL-Refaie
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Permanent Magnet ◽  
Electric Vehicles ◽  
Scaling Up ◽  
Electrical Machines ◽  
Mechanical Structure ◽  
Physical Isolation ◽  
Rotational Components ◽  
Rare Earth Content

This paper covers a new emerging class of electrical machines, namely, Magnetic Gears (MGs) and Magnetically Geared Machines (MGMs). This particular kind of gears/machines is capable of either scaling up or down the revolutions-per-minute to meet various load profiles as in the case of mechanical gearboxes, but with physical isolation between the rotating components. This physical isolation between the rotational components leads to several advantages in favor of MGs and MGMs over mechanical gearboxes. Although MGs and MGMs can potentially provide a solution for some of the practical issues of mechanical gears, MGs and MGMs have two major challenges that researchers have been trying to address. Those challenges are the high usage of rare-earth Permanent Magnet (PM) materials and the relatively complex mechanical structure of MGs and MGMs, both of which are a consequence of the multi-airgap design. This paper presents designs that reduce the PM rare-earth content for Electric Vehicles (EVs). Additionally, the paper will ensure having practical designs that do not run the risk of permanent demagnetization. The paper will also discuss some new designs to simplify the mechanical structure.

scholarly journals Conceptual Framework of Antecedents to Trends on Permanent Magnet Synchronous Generators for Wind Energy Conversion Systems

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2616 ◽  
Author(s):  
K. Padmanathan ◽  
N. Kamalakannan ◽  
P. Sanjeevikumar ◽  
F. Blaabjerg ◽  
J. B. Holm-Nielsen ◽  
...  
Keyword(s):  
Wind Energy ◽  
Energy Conversion ◽  
Conceptual Framework ◽  
Permanent Magnet ◽  
Electrical Machines ◽  
Special Focus ◽  
Electrical Machine ◽  
Synchronous Generators ◽  
Wind Energy Conversion ◽  
Permanent Magnet Synchronous Generators

Wind Energy Conversion System (WECS) plays an inevitable role across the world. WECS consist of many components and equipment’s such as turbines, hub assembly, yaw mechanism, electrical machines; power electronics based power conditioning units, protection devices, rotor, blades, main shaft, gear-box, mainframe, transmission systems and etc. These machinery and devices technologies have been developed on gradually and steadily. The electrical machine used to convert mechanical rotational energy into electrical energy is the core of any WECS. Many electrical machines (generator) has been used in WECS, among the generators the Permanent Magnet Synchronous Generators (PMSGs) have gained special focus, been connected with wind farms to become the most desirable due to its enhanced efficiency in power conversion from wind energy turbine. This article provides a review of literatures and highlights the updates, progresses, and revolutionary trends observed in WECS-based PMSGs. The study also compares the geared and direct-driven conversion systems. Further, the classifications of electrical machines that are utilized in WECS are also discussed. The literature review covers the analysis of design aspects by taking various topologies of PMSGs into consideration. In the final sections, the PMSGs are reviewed and compared for further investigations. This review article predominantly emphasizes the conceptual framework that shed insights on the research challenges present in conducting the proposed works such as analysis, suitability, design, and control of PMSGs for WECS.

Handling and Fixation of Permanent Magnets

2013 ◽  
Vol 769 ◽  
pp. 3-10 ◽  
Author(s):  
Jan Tremel ◽  
Benjamin Hofmann ◽  
Florian Risch
Keyword(s):  
Rare Earth ◽  
Permanent Magnet ◽  
Electric Vehicles ◽  
Permanent Magnets ◽  
Electrical Machines ◽  
Research Projects ◽  
Fixation Methods ◽  
High Efficient ◽  
The Family

Due to rapid developments within the family of rare-earth materials innovative electrical machines can nowadays be used as high efficient generators in various power, as well as rugged constructed machines for automobile battery based propulsion in hybrid and full electric vehicles. The production of different motor concepts spread into different design variants and creates complex variations especially regarding the rotor. Deriving from various research projects, the handling of the permanent magnet components is investigated, including the development of new assembly and fixation methods.

In-situ magnetization of NdFeB magnets for permanent magnet machines

1991 ◽  
Vol 27 (5) ◽  
pp. 4355-4359 ◽  
Author(s):  
L. Chang ◽  
T.R. Eastham ◽  
G.E. Dawson
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Machines ◽  
Ndfeb Magnets

scholarly journals Efek Air Gap pada Rancang Bangun dan Uji Performa Generator Listrik Fluks Aksial Berbasis Magnet Permanen NdFeB

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Ahmad Maulana
Keyword(s):  
Performance Analysis ◽  
Permanent Magnet ◽  
Rotational Speed ◽  
Output Voltage ◽  
Permanent Magnets ◽  
Air Gap ◽  
Axial Flux ◽  
Ndfeb Magnets ◽  
Magnetic Remanence ◽  
Electrical Generator

Abstrak:Dalam penelitian ini telah dianalisis efek air gap terhadap performa generator listrik tipe fluks aksial berbasismagnet permanen NdFeB. Analisis performa dilakukan dengan mengukur output tegangan generator listrik fluks aksialterhadap ukuran air gap dan kecepatan putar rotor. Air gap antara stator dan rotor divariasikan dari 7 sampai 20 mm. Darihasil eksperimen, peningkatan remanansi magnet berbanding lurus terhadap peningkatan output tegangan. Sebaliknya,peningkatan ukuran air gap menurunkan tegangan output secara linier. Hal ini disebabkan oleh adanya penurunan magnetikflux density secara exponensial. Pada ukuran air gap 7 mm dan kecepatan rotor 1500 rpm, dihasilkan output teganganmaksimal untuk Br = 0,2 dan 1,3 Tesla berturut-turut sebesar 10,4 dan 67,7 volt.Kata Kunci: air gap, generator listrik fluks aksial, ouput tegangan, magnet NdFeBAbstract:In this paper, the effect of air gap to the performance of NdFeB based permanent magnet axial flux electricalgenerator have been analyzed. The performance analysis was performed by measuring the ouput potential of generator asthe changing of air gap and rotational speed of rotor. The air gap was varied from 7 to 20 mm. Based on the experiment, theincreasing of magnetic remanence of permanent magnets was linearly corelated to the increasing of output voltage. On theother hand, increasing of the air gap was linearly reduced the ouput voltage. This effect is caused by the decreasing ofmagnetic flux densityexponentially. On the fixed air gap of 7 mm androtational speed of 1500 rpm, the maximum ouputvoltage is achived for Br = 0.2 and 1.3 Tesla  with the value of 10.4 and 67.7 volt, respectively.Keywords: air gap, axial flux electrical generator, ouput voltage, NdFeB magnets

Two-dimensional steady-state thermal analytical model of permanent-magnet synchronous machines operating in generator mode

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Zakarya Djelloul Khedda ◽  
Kamel Boughrara ◽  
Frédéric Dubas ◽  
Baocheng Guo ◽  
El Hadj Ailam
Keyword(s):  
Steady State ◽  
Temperature Distribution ◽  
Permanent Magnet ◽  
Analytical Model ◽  
Electrical Machines ◽  
Synchronous Machines ◽  
Analytical Prediction ◽  
Two Dimensional ◽  
Content Type ◽  
Proposed Model

Purpose Thermal analysis of electrical machines is usually performed by using numerical methods or lumped parameter thermal networks depending on the desired accuracy. The analytical prediction of temperature distribution based on the formal resolution of thermal partial differential equations (PDEs) by the harmonic modeling technique (or the Fourier method) is uncommon in electrical machines. Therefore, this paper aims to present a two-dimensional (2D) analytical model of steady-state temperature distribution for permanent-magnet (PM) synchronous machines (PMSM) operating in generator mode. Design/methodology/approach The proposed model is based on the multi-layer models with the convolution theorem (i.e. Cauchy’s product theorem) by using complex Fourier’s series and the separation of variables method. This technique takes into the different thermal conductivities of the machine parts. The heat sources are determined by calculating the different power losses in the PMSM with the finite-element method (FEM). Findings To validate the proposed analytical model, the analytical results are compared with those obtained by thermal FEM. The comparisons show good results of the proposed model. Originality/value A new 2D analytical model based on the PDE in steady-state for full prediction of temperature distribution in the PMSM takes into account the heat transfer by conduction, convection and radiation.

Feasibility of low-cost magnetic rail designs by integrating ferrite magnets and NdFeB magnets for HTS Maglev systems

2015 ◽  
Vol 29 (25n26) ◽  
pp. 1542043 ◽  
Author(s):  
R. X. Sun ◽  
Z. G. Deng ◽  
Y. F. Gou ◽  
Y. J. Li ◽  
J. Zheng ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Magnetic Energy ◽  
Low Cost ◽  
Ndfeb Magnets ◽  
Energy Product ◽  
Element Simulation ◽  
Calculation Results ◽  
Hts Maglev ◽  
The Cost

Permanent magnet guideway (PMG) is an indispensable part of high temperature superconducting (HTS) Maglev systems. Present PMGs are made of NdFeB magnets with excellent performance and cost much. As another permanent magnet material, the ferrite magnet is weak at magnetic energy product and coercive force, but inexpensive. So, it is a possible way to integrate the ferrite and NdFeB magnets for cutting down the cost of present PMGs. In the paper, the equivalent on magnetic field intensity between ferrite magnets and NdFeB magnets was evaluated by finite element simulation. According to the calculation results, the magnetic field of the PMG integrating ferrite magnets and NdFeB magnets can be increased remarkably comparing with the pure ferrite PMG. It indicates that low-cost PMG designs by integrating the two permanent magnet materials are feasible for the practical HTS Maglev system.

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