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Journal articles on the topic 'Demagnetization analysis'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Bifeng, Zhou, Tang Guoning, and Luo Yiping. "Dynamics modeling and analysis of the permanent-magnet synchronous motors bearing-rotor-magnetic field under rotor demagnetize." Advances in Mechanical Engineering 13, no. 6 (2021): 168781402110254. http://dx.doi.org/10.1177/16878140211025413.

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For the phenomenon of rotor demagnetization of Permanent Magnet Synchronous Motor(PMSM), studying the dynamic modeling and analysis of demagnetization rotor. Firstly, considering the unbalanced magnetic pulling (UMP) of the rotor under the demagnetization and the nonlinear Hertz contact generated by the rolling bearing, the double rectangular coordinate system of the stator and rotor is constructed, and the mathematical model of the unbalanced magnetic pull UMP is constructed with the rectangular coordinate as the variable. Then, the dynamics Jeffcott model of the bearing-rotor- magnetic field

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2

Mahmouditabar, Farshid, Abolfazl Vahedi, Pourya Ojaghlu, and Noureddine Takorabet. "Irreversible demagnetization analysis of RWAFPM motor using modified MEC algorithm." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 39, no. 5 (2020): 1227–39. http://dx.doi.org/10.1108/compel-01-2020-0021.

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Purpose This paper aims to present a modified MEC algorithm for demagnetization modeling of the PM motor. One of the major issues that the designers of the permanent magnet (PM) motors are faced with is the demagnetization of magnets because of high temperatures and armature reaction. Demagnetization will weaken the magnetic properties of the magnet and lead to a reduction in the performance of the motor. Therefore, it is essential to provide appropriate methods for modeling this phenomenon. One of these methods that has a compromise between accuracy and time consumption is the magnetic equiva

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3

Krichen, Manel, Elhoussin Elbouchikhi, Naourez Benhadj, Mohamed Chaieb, Mohamed Benbouzid, and Rafik Neji. "Motor Current Signature Analysis-Based Permanent Magnet Synchronous Motor Demagnetization Characterization and Detection." Machines 8, no. 3 (2020): 35. http://dx.doi.org/10.3390/machines8030035.

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Neodymium-boron (NdFeB) permanent magnets (PMs) have been widely studied in the past years since they became the material of choice in permanent magnet synchronous machines (PMSMs). Although NdFeB PMs have a better energy density than other types of magnets and are cost-effective, their magnetization is very sensitive to the PMSM operating conditions, in particular temperature, where the irreversible demagnetization degree increases over time. Therefore, it is important to characterize and diagnose demagnetization at an early stage. In this context, this paper proposes a two-step analysis stud

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4

Ahmad, M. Z., E. Sulaiman, S. K. Rahimi, G. M. Romalan, and M. Jenal. "Analysis of Permanent Magnet Demagnetization Effect Outer-rotor Hybrid Excitation Flux Switching Motor." International Journal of Power Electronics and Drive Systems (IJPEDS) 8, no. 1 (2017): 255. http://dx.doi.org/10.11591/ijpeds.v8.i1.pp255-261.

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This paper addresses the irreversible permanent magnet (PM) demagnetization analysis of hybrid excitation flux switching motor (HEFSM) with outer-rotor configuration. PM demagnetization cause the PM strength used in the motor significantly reduces and hence contributes less torque performance. The study is focused on thermal analysis and conducted at various temperature up to as high as 180 degrees Celsius which has a tendency to be demagnetized. Therefore, PM demagnetization is among a critical issue and influences the choice of the applied motor. The analysis is carried out based on finite e

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5

Guo, Wanwu, Michael C. Dentith, Robert T. Bird, and David A. Clark. "Systematic error analysis of demagnetization and implications for magnetic interpretation." GEOPHYSICS 66, no. 2 (2001): 562–70. http://dx.doi.org/10.1190/1.1444947.

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Demagnetization can affect the interpretation of magnetic data significantly. However, little attempt has been made to understand its effects by analyzing systematically the differences between demagnetization‐ corrected and uncorrected magnetic properties. A systematic error analysis is made in this paper using a 2-D elliptic cylinder model. Generally, demagnetization changes the effective susceptibility and remanence or the effective magnetization in both magnitude and direction. Error analyses show that demagnetization causes the magnitude of effective magnetization of a magnetic body to be

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6

Choi, Gilsu. "Analysis and Experimental Verification of the Demagnetization Vulnerability in Various PM Synchronous Machine Configurations for an EV Application." Energies 14, no. 17 (2021): 5447. http://dx.doi.org/10.3390/en14175447.

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Safety is a critical feature for all passenger vehicles, making fail–safe operation of the traction drive system highly important. Increasing demands for traction drives that can operate in challenging environments over wide constant power speed ranges expose permanent magnet (PM) machines to conditions that can cause irreversible demagnetization of rotor magnets. In this paper, a comprehensive analysis of the demagnetization vulnerability in PM machines for an electric vehicle (EV) application is presented. The first half of the paper presents rotor demagnetization characteristics of several

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7

Ngo and Hsieh. "Performance Analysis of Synchronous Reluctance Motor with Limited Amount of Permanent Magnet." Energies 12, no. 18 (2019): 3504. http://dx.doi.org/10.3390/en12183504.

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This paper analyzes the performance of a synchronous reluctance motor (SynRM) equipped with a limited amount of a permanent magnet (PM). This is conventionally implemented by inserting PMs in rotor flux barriers, and this is often called the PM-assisted SynRM (PMa-SynRM). However, common PMa-SynRMs could be vulnerable to irreversible demagnetization. Therefore, motor performance and PM demagnetization should be simultaneously considered, and this would require the PM to be properly arranged. In this paper, various rotor configurations are carefully studied and compared in order to maximize the

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8

Liu, Ji Zhu, Xiao Hui Yu, Shao Hua Wang, Tao Chen, and Rui Zheng Long. "Calculation and Analysis on PM Thermal Characteristics Influence Performance of PMSM Based on FEM." Applied Mechanics and Materials 84-85 (August 2011): 676–80. http://dx.doi.org/10.4028/www.scientific.net/amm.84-85.676.

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The irreversible demagnetization of Nd-Fe-B permanent magnet (PM) material appears during the use of Nd-Fe-B permanent magnet synchronous motor (PMSM) has been blocking this kind of motor towards the direction of large-scale. Demagnetization of PM is mainly affected by the working temperature and the reverse magnetic field of stator armature, and the accurate calculation for the demagnetization characteristics of PMSM is usually difficult by using the analytical method. In this paper, we derive the calculation formula of the knee point under a working temperature for permanent magnets in PMSM

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9

Сорокина, Nataliya Sorokina, Закомолдин, et al. "Demagnetization Experience in Shipbuilding. Application to Different Industries." NDT World 18, no. 3 (2015): 21–24. http://dx.doi.org/10.12737/12568.

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The article proves the necessity for a demagnetization process in mechanical engineering, nondestructive testing, welding. Analysis of demagnetization methods of offshore facilities in shipbuilding, proven experimentally, gives examples of their effective use in other areas of technology. The article gives in general terms a theoretical basis of demagnetization and highlights the need to achieve a stable demagnetized state for large-scale structures. Taking into account the demagnetization experience in shipbuilding, the authors offer a simplified version of a stationary stand designed to redu

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10

You, Yong-min, and Keun-young Yoon. "Multi-Objective Optimization of Permanent Magnet Synchronous Motor for Electric Vehicle Considering Demagnetization." Applied Sciences 11, no. 5 (2021): 2159. http://dx.doi.org/10.3390/app11052159.

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The irreversible demagnetization of permanent magnets causes the deterioration of the performance in permanent magnet synchronous motors (PMSMs), which are used for electric vehicles. NdFeB, which is the permanent magnet most commonly used in PMSMs for electric vehicles, is easily demagnetized at high temperatures. Because traction motors for electric vehicles reach high temperatures, and a high current can be instantaneously applied, permanent magnets of PMSM can be easily demagnetized. Therefore, it is important to study the demagnetization phenomenon of PMSMs for electric vehicles. However,

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11

Li, Ju Ping, Shi Bin Liu, Wen Guang Feng, and Bo Guo. "Analysis of a Fluxgate Incorporating Demagnetization Field." Advanced Materials Research 476-478 (February 2012): 1425–28. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.1425.

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It is not accurate incorporating the demagnetizing field by the average demagnetizing factor due to the time variations of the permeability and the dependence of the demagnetization field on the permeability of the sample material. Especially when the magnetic field changes with the position greatly, the local demagnetizing tensor can't be simplified as a number D, thus the internal field H can't be described by demagnetization coefficient D. Although the transient magnetic simulation using the finite-element method can give a correct result, the computation time is relatively too long. Especi

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12

Mizuno, T., M. Kawai, T. Tashiro, H. Shiratori, H. Yamada, and H. Yamada. "Performance Analysis of Rotating Permanent-Magnets Demagnetization." Journal of the Magnetics Society of Japan 27, no. 5 (2003): 675–80. http://dx.doi.org/10.3379/jmsjmag.27.675.

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13

Baranski, Mariusz, Wojciech Szelag, and Wieslaw Lyskawinski. "Analysis of the Partial Demagnetization Process of Magnets in a Line Start Permanent Magnet Synchronous Motor." Energies 13, no. 21 (2020): 5562. http://dx.doi.org/10.3390/en13215562.

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The paper justifies the validity of analyzing the impact of temperature and the process of partial demagnetization of magnets on the operating parameters of machines. To analyze this impact, a field model of coupled electromagnetic and thermal phenomena in a permanent magnet synchronous motor was proposed. The non-linearity of the magnetic circuit, the effect of temperature on the magnetic, electrical and thermal properties of the materials as well as the developed method of modeling the process of partial demagnetization of the magnet were taken into account. Based on this model, an algorithm

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14

Zhou, Quan, Xuexun Guo, Gangfeng Tan, Xiaomeng Shen, Yifan Ye, and Zhaohua Wang. "Parameter Analysis on Torque Stabilization for the Eddy Current Brake: A Developed Model, Simulation, and Sensitive Analysis." Mathematical Problems in Engineering 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/436721.

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Eddy current brake (ECB) is an attractive contactless brake whereas it suffers from braking torque attenuation when the rotating speed increases. To stabilize the ECB’s torque generation property, this paper introduces the concept of anti-magneto-motive force to develop the ECB model on the fundamental of magnetic circles. In the developed model, the eddy current demagnetization and the influence of temperature which make the braking torque attenuation are clearly presented. Using the developed model of ECB, the external and internal characteristics of the ECB are simulated through programming

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15

Ishikawa, Takeo, and Naoto Igarashi. "Failure Diagnosis of Demagnetization in Interior Permanent Magnet Synchronous Motors Using Vibration Characteristics." Applied Sciences 9, no. 15 (2019): 3111. http://dx.doi.org/10.3390/app9153111.

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The detection of a precursor to the demagnetization of permanent magnets is very important because a high degree of reliability is necessary in permanent magnet synchronous motors (PMSMs). This paper investigated the diagnosis of very slight PM demagnetization. A part of the permanent magnet was altered to non-magnetic material so as to mimic the effect of demagnetization. The vibration characteristics were clarified for low demagnetization in PMSMs driven under vector control by experiments and 3D finite element (FE) analysis. We found that the amplitude of some components of the vibration wa

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16

Gao, Caixia, Yanjie Nie, Jikai Si, Ziyi Fu, and Haichao Feng. "Mode Recognition and Fault Positioning of Permanent Magnet Demagnetization for PMSM." Energies 12, no. 9 (2019): 1644. http://dx.doi.org/10.3390/en12091644.

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This paper proposes a demagnetization fault detection, mode recognition, magnetic pole positioning, and degree evaluation method for permanent magnet synchronous motors. First, the analytical model of the single-coil no-load back electromotive force (EMF) of demagnetization fault for Permanent magnet synchronous motor (PMSM) arbitrary magnetic poles is established. In the analytical model, the single-coil no-load back EMF residual of the health state and the single magnetic pole sequential demagnetization fault are calculated and normalized. Model results are used as the fault sample database.

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17

Quintal-Palomo, Roberto Eduardo. "Analysis of Current Signals in a Partially Demagnetized Vector Controlled Interior Permanent Magnet Generator." Power Electronics and Drives 4, no. 1 (2019): 179–90. http://dx.doi.org/10.2478/pead-2019-0012.

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AbstractThis manuscript analyzes the operation of an interior permanent magnet (IPM) machine working as a permanent magnet synchronous generator (PMSG). The partial demagnetization operation is analyzed. To obtain more accurate voltages and currents of the machine, finite element analysis (FEA) is used in co-simulation with the full converter and the converter’s control algorithm. Direct field oriented control (DFOC) shows robustness by maintaining the speed even with a 25% demagnetized PMSG. Also, an analysis of the rotating reference frame DQ signals is done to asses demagnetization.

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18

Candelo-Zuluaga, Carlos, Jordi-Roger Riba, Dinesh V. Thangamuthu, and Antoni Garcia. "Detection of Partial Demagnetization Faults in Five-Phase Permanent Magnet Assisted Synchronous Reluctance Machines." Energies 13, no. 13 (2020): 3496. http://dx.doi.org/10.3390/en13133496.

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This paper analyzes partial demagnetization faults in a five-phase permanent magnet assisted synchronous reluctance motor (fPMa-SynRM) incorporating ferrite permanent magnets (PMs). These faults are relevant because of the application of field weakening, or due to high operating temperatures or short circuit currents, the PMs can become irreversibly demagnetized, thus affecting the performance and safe operation of the machine. This paper proposes fault indicators to detect such fault modes with low demagnetization levels between 5.0% to 16.7% relative demagnetization. Four partial demagnetiza

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19

Barmpatza, Alexandra C., and Joya C. Kappatou. "Study of a Combined Demagnetization and Eccentricity Fault in an AFPM Synchronous Generator." Energies 13, no. 21 (2020): 5609. http://dx.doi.org/10.3390/en13215609.

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This article investigates the combined partial demagnetization and static eccentricity fault in an Axial Flux Permanent Magnet (AFPM) Synchronous Generator. The machine is simulated using 3D FEM, while the EMF spectrum is analyzed in order to export the fault related harmonics using the FFT analysis. Firstly, the partial demagnetization fault, without the coexistence of eccentricity, and both the static angular and axis eccentricity faults, without the coexistence of partial demagnetization, are studied. In the case of eccentricity fault, the phase EMF sum spectrum has also been used as a diag

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20

Ishikawa, Takeo, Naoto Igarashi, and Nobuyuki Kurita. "Failure Diagnosis for Demagnetization in Interior Permanent Magnet Synchronous Motors." International Journal of Rotating Machinery 2017 (2017): 1–13. http://dx.doi.org/10.1155/2017/2716814.

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Since a high degree of reliability is necessary for permanent magnet synchronous motors, the detection of a precursor for the demagnetization of permanent magnets is very important. This paper investigates the diagnosis of very slight PM demagnetization. The permanent magnet volume is altered so as to mimic the effect of demagnetization. This paper investigates the influence of demagnetization by using several methods: the 3D finite element analysis (FEA) of the motor, the measurement of high-frequency impedance, and the measurement and FEA of the stator voltage and current under vector contro

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21

Galea, Michael, Luca Papini, He Zhang, Chris Gerada, and Tahar Hamiti. "Demagnetization Analysis for Halbach Array Configurations in Electrical Machines." IEEE Transactions on Magnetics 51, no. 9 (2015): 1–9. http://dx.doi.org/10.1109/tmag.2015.2429645.

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22

Beleggia, Marco, Marc De Graef, and Yonko T. Millev. "Magnetostatics of the uniformly polarized torus." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 465, no. 2112 (2009): 3581–604. http://dx.doi.org/10.1098/rspa.2009.0355.

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We provide an exhaustive description of the magnetostatics of the uniformly polarized torus and its derivative self-intersecting (spindle) shapes. In the process, two complementary approaches have been implemented, position-space analysis of the Laplace equation with inhomogeneous boundary conditions and a Fourier-space analysis, starting from the determination of the shape amplitude of this topologically non-trivial body. The stray field and the demagnetization tensor have been determined as rapidly converging series of toroidal functions. The single independent demagnetization-tensor eigenva

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23

Nacy, Somer, and George Youssef. "Demagnetization Effect on the Magnetoelectric Response of Composite Multiferroic Cylinders." Journal of Composites Science 5, no. 5 (2021): 139. http://dx.doi.org/10.3390/jcs5050139.

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Strain-mediated multiferroic composite structures are gaining scientific and technological attention because of the promise of low power consumption and greater flexibility in material and geometry choices. In this study, the direct magnetoelectric coupling coefficient (DME) of composite multiferroic cylinders, consisting of two mechanically bonded concentric cylinders, was analytically modeled under the influence of a radially emanating magnetic field. The analysis framework emphasized the effect of demagnetization on the overall performance. The demagnetization effect was thoroughly consider

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24

Santugini-Repiquet, Kévin. "Homogenization of the demagnetization field operator in periodically perforated domains." Journal of Mathematical Analysis and Applications 334, no. 1 (2007): 502–16. http://dx.doi.org/10.1016/j.jmaa.2007.01.001.

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25

Jung, Jae-Woo, Byeong-Hwa Lee, Kyu-Seob Kim, and Sung-Il Kim. "Interior Permanent Magnet Synchronous Motor Design for Eddy Current Loss Reduction in Permanent Magnets to Prevent Irreversible Demagnetization." Energies 13, no. 19 (2020): 5082. http://dx.doi.org/10.3390/en13195082.

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We designed and analyzed an interior permanent magnet synchronous motor (IPMSM) to prevent irreversible demagnetization of the permanent magnets (PMs). Irreversible demagnetization of NdFeB PMs mainly occurs due to high temperature, which should thus be minimized. Therefore, it is necessary to reduce the eddy current loss in the PM through optimal design. The shape of the rotor core was optimized using finite element analysis (FEA) and response surface methodology. Three-dimensional (3-D) FEA is required for accurate computation of the eddy current loss, but there is huge time, effort, and cos

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26

Karasawa, Masanobu, and Kazuyuki Ishii. "Pulsed laser induced heat transfer from a phthalocyanine-based thin film to a Bi, Al-substituted DyIG substrate: photothermal demagnetization observed by magnetic circular dichroism and numerical analysis." Physical Chemistry Chemical Physics 20, no. 17 (2018): 12241–47. http://dx.doi.org/10.1039/c8cp01789a.

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27

Yang, Lijie, Caiming Deng, and Guimei Wang. "Demagnetization Modeling and Characteristic Analysis of Belt Conveyor Permanent Magnet Electric Roller Based on Back Electromotive Force." Journal of Nanoelectronics and Optoelectronics 16, no. 6 (2021): 957–66. http://dx.doi.org/10.1166/jno.2021.3039.

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The demagnetization of permanent magnet electric roller of coal mine belt conveyor will reduce the comprehensive performance of electric roller. In serious cases, the belt conveyor will stop suddenly or burn down, leading to the failure of normal production and safety accidents on the site. In this paper, starting from the A-phase current and output torque angles under different degrees of loss of magnetic fault, the B–H curve is fitted by linear ratio, and the reverse electromotive force is modeled by numerical analysis method. A diagnosis method for the degree of demagnetization of permanent

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28

Bianchini, Claudio, Ambra Torreggiani, Matteo Davoli, and Alberto Bellini. "Design of Low-Cost Synchronous Machine to Prevent Demagnetization." Energies 13, no. 14 (2020): 3566. http://dx.doi.org/10.3390/en13143566.

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The request for high efficiency motor paves the way for the replacement of induction motors with permanent magnet synchronous motors. Although the efficiency is increased, for medium and high power, the current ripple causes significant additional losses in the magnet and lamination; and, high temperature can lead to demagnetization. In this paper, a new rotor topology is proposed and compared to a traditional surface permanent magnet rotor to reduce the magnet losses and protect them from demagnetization. A reference surface permanent magnet machine is compared with the proposed one in terms

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29

Zhu, Xian Qiao, and Da Ming Liu. "Magnetic Analysis of Ferromagnetic Substance in the Process of Rotation Demagnetization." Applied Mechanics and Materials 229-231 (November 2012): 51–54. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.51.

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To solve the problem that is the poor demagnetizing effect and stability issues by the way of demagnetization in the one-dimensional space, a new degaussing method was studied in this paper, based on the analysis of magnetic moment angle distribution during the degaussing deal to iron material. Through the magnetization process analysis to iron material in the rotating magnetic field, the theory has some merits such as good degaussing effect and stability to the iron material after degaussing deal in two-dimensional space. The rotation degaussing enhancing the stability of material magnetic fi

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30

Shang-Chun, Shi, Meng Chuan-Min, He Hong-Liang, Dong Shi, and Zhao Feng. "Design and Parameter Analysis for Explosive-Driven Demagnetization Pulsed Power Source." Chinese Physics Letters 23, no. 2 (2006): 423–25. http://dx.doi.org/10.1088/0256-307x/23/2/041.

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Li, Wenlong, Guodong Feng, Chunyan Lai, Ze Li, Jiangbo Tian, and Narayan C. Kar. "Demagnetization Analysis of Interior Permanent Magnet Machines Under Integrated Charging Operation." IEEE Transactions on Industry Applications 55, no. 5 (2019): 5204–13. http://dx.doi.org/10.1109/tia.2019.2922209.

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32

Holm, Eric J., and Kenneth L. Verosub. "An analysis of the effects of thermal demagnetization on magnetic carriers." Geophysical Research Letters 15, no. 5 (1988): 487–90. http://dx.doi.org/10.1029/gl015i005p00487.

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Zhou, P., D. Lin, Y. Xiao, N. Lambert, and M. A. Rahman. "Temperature-Dependent Demagnetization Model of Permanent Magnets for Finite Element Analysis." IEEE Transactions on Magnetics 48, no. 2 (2012): 1031–34. http://dx.doi.org/10.1109/tmag.2011.2172395.

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34

Fujisaki, J., A. Furuya, H. Shitara, et al. "Demagnetization Correction Method by Using Inverse Analysis Considering Demagnetizing Field Distribution." IEEE Transactions on Magnetics 56, no. 4 (2020): 1–4. http://dx.doi.org/10.1109/tmag.2019.2957578.

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35

Tay, C. Y. "Mean demagnetization step concept from similarity analysis of fabricated ferromagnet sets." Journal of Materials Science Letters 12, no. 21 (1993): 1673–75. http://dx.doi.org/10.1007/bf00418826.

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Momma, D., Y. Yoshida, and K. Tajima. "Demagnetization Analysis of Ferrite Magnet Using Two-line Approximation Based on Reluctance Network Analysis." Journal of the Magnetics Society of Japan 40, no. 4 (2016): 115–19. http://dx.doi.org/10.3379/msjmag.1605r008.

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Lin, He Yun, Ping Jin, and Shu Hua Fang. "Synthetic Boundary Conditions for Analytical Magnetic Field Analysis of Halbach Magnet Arrays." Applied Mechanics and Materials 416-417 (September 2013): 373–78. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.373.

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This paper presents a kind of synthetic boundary conditions for the analytical magnetic field analysis of Halbach magnet array, which are derived from the linear demagnetization characteristic and the equivalent surface current of permanent magnet (PM). With the proposed synthetic boundary conditions, boundaries of Halbach PM array are simplified to only two surfaces. As a result, a relatively simple analytical solutions of Halbach magnetization topology based on the magnetic scalar potential (MSP) are obtained.

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38

Xu, Peifeng, Kai Shi, and Yi Zhu. "Demagnetization Analysis of Ferrite Permanent Magnets in Dual Rotor Wind Power Generator." International Journal of Control and Automation 9, no. 11 (2016): 443–54. http://dx.doi.org/10.14257/ijca.2016.9.11.38.

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Zhilichev, Y. "Analysis of Permanent Magnet Demagnetization Accounting for Minor $B\hbox{–}H$ Curves." IEEE Transactions on Magnetics 44, no. 11 (2008): 4285–88. http://dx.doi.org/10.1109/tmag.2008.2001343.

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40

Zhang, Yue, Sean McLoone, and Wenping Cao. "Electromagnetic Loss Modeling and Demagnetization Analysis for High Speed Permanent Magnet Machine." IEEE Transactions on Magnetics 54, no. 3 (2018): 1–5. http://dx.doi.org/10.1109/tmag.2017.2759247.

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41

Rao, Dantam, and Madhan Bagianathan. "Selection of Optimal Magnets for Traction Motors to Prevent Demagnetization." Machines 9, no. 6 (2021): 124. http://dx.doi.org/10.3390/machines9060124.

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Currently, permanent-magnet-type traction motors drive most electric vehicles. However, the potential demagnetization of magnets in these motors limits the performance of an electric vehicle. It is well known that during severe duty, the magnets are demagnetized if they operate beyond a ‘knee point’ in the B(H) curve. We show herein that the classic knee point definition can degrade a magnet by up to 4 grades. To prevent consequent excessive loss in performance, this paper defines the knee point k as the point of intersection of the B(H) curve and a parallel line that limits the reduction in i

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42

Zhiyan, Zhang, Xie Zehui, Ma Hongzhong, and Qin Zhong. "ANALYSIS OF DEMAGNETIZATION FAULT BACK-EMF OF PERMANENT MAGNET SYNCHRONOUS MOTOR USING MATHEMATICAL MODEL BASED ON MAGNETIC FIELD SUPERPOSITION PRINCIPLE." Tekhnichna Elektrodynamika 2016, no. 2 (2016): 42–48. http://dx.doi.org/10.15407/techned2016.02.042.

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43

Palomo, Roberto Eduardo Quintal, and Maciej Gwozdziewicz. "Effect of Demagnetization on a Consequent Pole IPM Synchronous Generator." Energies 13, no. 23 (2020): 6371. http://dx.doi.org/10.3390/en13236371.

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The design and analysis of a permanent magnet synchronous generator (PMSG) are presented. The interior permanent magnet (IPM) rotor was designed asymmetric and with the consequent pole approach. The basis for the design was a series-produced three-phase induction motor (IM) and neodymium iron boron (Nd-Fe-B) cuboid magnets were used for the design. For the partial demagnetization analysis, some of the magnets were extracted and the results are compared with the finite element analysis (FEA).

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Lileev, Alexey S. "Analysis of Remagnetization Processes of High-Anisotropic Alloy after Heat Treatment." Defect and Diffusion Forum 410 (August 17, 2021): 56–61. http://dx.doi.org/10.4028/www.scientific.net/ddf.410.56.

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The simulation of the Sm(Co, Fe, Cu, Zr)7.5 type alloy domain structure formation after various thermal treatments was carried out by FMRM program based on a phenomenological approach to the analysis of the uniaxial highly anisotropic ferromagnets demagnetization processes. It is shown that the domain structure of the alloy in the thermally demagnetized state expands as the coercive force of the alloy decreases. It is noted that the domains size increasing process is associated not only with a decrease in the coercive force but also with a change in the influence of the magnetostatic interacti

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Chen, Yi, Yihua Yao, Qinfen Lu, Xiaoyan Huang, and Yunyue Ye. "Thermal modeling and analysis of double-sided water-cooled permanent magnet linear synchronous machines." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 35, no. 2 (2016): 695–712. http://dx.doi.org/10.1108/compel-12-2015-0443.

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Purpose – With the popularization of permanent magnet linear synchronous machines (PMLSMs) in recent years, the temperature rise has attracted increasingly attention since excessive heat generated in the windings could deteriorate the electromagnetic performance. In order to solve this problem, adopting water-cooled system is an effective method. The purpose of this paper is to investigate a 12-slot/11-pole (12S/11P) water-cooled double-sided PMLSM, which adopts the all teeth wound concentrated winding and shifted armature ends. Design/methodology/approach – Based on 2D finite element analysis

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Tema, E., S. Pavlides, and D. Kondopoulou. "Late bronze age pottery as indicator of the deposition temperatures of the Minoan pyroclastic products, Santorini, Greece." Bulletin of the Geological Society of Greece 47, no. 3 (2016): 1289. http://dx.doi.org/10.12681/bgsg.10904.

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The Minoan eruption of Santorini volcano (Greece) took place in the Late Bronze Age (17th century BC) and produced a great volume of volcanic products that covered the whole island and buried every human settlement under meters of pyroclastic deposits. In this study we used thermal analysis of the magnetic remanence carried by pottery fragments buried under the pyroclastic deposits in order to estimate the thermal effect of the Minoan volcanic products on the pre-eruption habitation level. A total of 70 samples, prepared from 45 independent pottery fragments, have been studied. Samples were co

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Wang, Yan Jie, and San Ping Zhou. "Simulation Analysis of Temperature Field of Permanent Magnet Governor." Advanced Materials Research 1044-1045 (October 2014): 422–25. http://dx.doi.org/10.4028/www.scientific.net/amr.1044-1045.422.

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In the operation process of permanent magnet governor, the temperature rises due to eddy current loss, and demagnetization of permanent magnet occurs at high temperature. The numerical simulation of fluid flow field and temperature field was carried out with the method of computational fluid dynamics (CFD) and ANSYS-Fluent software. And then we improved the structure of permanent magnet governor on the basis of analysis of the flow field and temperature distribution. The result indicates that the flow of improved structure increases, and temperature drops 46.°C, fulfilling the desired temperat

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Yoo, Jin-Hyung, and Tae-Uk Jung. "Demagnetization Diagnosis of Permanent Magnet Synchronous Motor Using Frequency Analysis at Standstill Condition." Journal of Magnetics 21, no. 2 (2016): 249–54. http://dx.doi.org/10.4283/jmag.2016.21.2.249.

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Kikitsu, A., T. Nagase, T. Maeda, S. Tatsuta, and J. I. Akiyama. "Thermal demagnetization analysis of CoPt magnetic recording medium by magneto-optical recording test." IEEE Transactions on Magnetics 37, no. 4 (2001): 1250–53. http://dx.doi.org/10.1109/20.950809.

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Moon, Seokbae, Jewon Lee, Hyeyun Jeong, and Sang Woo Kim. "Demagnetization Fault Diagnosis of a PMSM Based on Structure Analysis of Motor Inductance." IEEE Transactions on Industrial Electronics 63, no. 6 (2016): 3795–803. http://dx.doi.org/10.1109/tie.2016.2530046.

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