Results 131 to 140 of about 428 (171)
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A Method to Compute the Irreversible Demagnetization Temperature in Permanent Magnets
2023 International Symposium on Electromobility (ISEM), 2023Permanent magnets (PM) containing rare earth elements are critical in developing traction drives for electric and hybrid vehicles. The demanding driving conditions heat the PMs and could lead to a degraded vehicle performance if the temperature exceeds the irreversible demagnetization boundary.
Aguilar-Zamorate, Irving S. +3 more
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SAE Technical Paper Series, 2022
<div class="section abstract"><div class="htmlview paragraph">In this paper, a linear oscillatory actuator (LOA) with moving magnets used in active engine mount is modeled and theoretically analyzed considering its performance decline at high temperature.
Luyao Fu, Shuguang Zuo, Dawei Zhou
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<div class="section abstract"><div class="htmlview paragraph">In this paper, a linear oscillatory actuator (LOA) with moving magnets used in active engine mount is modeled and theoretically analyzed considering its performance decline at high temperature.
Luyao Fu, Shuguang Zuo, Dawei Zhou
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Rapid and irreversible demagnetization of liquid samples
Journal of Magnetic Resonance (1969), 1988Abstract A technique to destroy irreversibly all components of the magnetization of a sample within a time interval short compared with the relaxation times T 1 , and T 2 is pointed out. This is required as the initial state for relaxation experiments with slowly relaxing nuclei, using the steady-state free precession technique. Several periodic
W Kreibich, A Schwenk
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Irreversible Demagnetization Fault Prognosis in a Permanent Magnet type Machines
2020 IEEE Energy Conversion Congress and Exposition (ECCE), 2020Irreversible demagnetization fault (IDF) is considered a constraint in permanent magnet (PM) types machines used in traction applications. Variation in temperature, load, field weakening, and mechanical stresses are the main reasons that can permanently demagnetize the PMs during steady-state operation.
Zia Ullah, Jin Hur
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Design of concentrated flux synchronous motor to prevent irreversible demagnetization
2017 IEEE International Electric Machines and Drives Conference (IEMDC), 2017IPMSM using rare earth materials utilize various areas with high power density and a wide speed range. However, as these materials can only be found in limited areas and quantities, use of machines with rare earth materials will decrease. To solve this problem, various types of machines have been studied with rare earth free elements.
Kyu-Seob Kim +3 more
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A study on irreversible permanent magnet demagnetization in flux-reversal machines
2011 International Conference on Electrical Machines and Systems, 2011Flux-reversal machine (FRM) is a new doubly-salient stator-permanent magnet (PM) machine with flux linkage reversal in the stator concentrated windings. The simple structure makes it cost effective and suitable for mass production. Also, the FRM has permanent magnets parallel to the stator magnet flux lines and thus is much more difficult to ...
Heung-Kyo Shin +2 more
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Irreversible demagnetization analysis of RWAFPM motor using modified MEC algorithm
COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 2020Purpose 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.
Mahmouditabar, Farshid +3 more
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Effect of design variables on irreversible magnet demagnetization in brushless dc motor
Journal of Applied Physics, 2005The large demagnetizing currents in brushless dc (BLdc) motor are generated by the short-circuited stator windings and the fault of a drive circuit. So, irreversible magnet demagnetization occurs due to the external demagnetizing field by these currents.
Tae Heoung Kim, Ju Lee
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Effect of design variables on irreversible permanent magnet demagnetization in flux-reversal machine
2005 International Conference on Electrical Machines and Systems, 2005The large demagnetizing currents in flux-reversal machine (FRM) are generated by the short-circuited of stator windings and the fault of a drive circuit. So, irreversible magnet demagnetization occurs due to the external demagnetizing field by these currents.
null Tae Heoung Kim +3 more
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Iranian Journal of Science and Technology, Transactions of Electrical Engineering, 2021
The recently introduced flux switching permanent magnet motor attracts a lot of attention thanks to a robust design, better heat dissipation, high reliability, high performance. The crucial step in developing the PM motor for different applications is the geometry optimization. In this paper, the modified multi-level multi-objective optimization method
F. Mahmouditabar, A. Vahedi
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The recently introduced flux switching permanent magnet motor attracts a lot of attention thanks to a robust design, better heat dissipation, high reliability, high performance. The crucial step in developing the PM motor for different applications is the geometry optimization. In this paper, the modified multi-level multi-objective optimization method
F. Mahmouditabar, A. Vahedi
openaire +1 more source