Results 11 to 20 of about 18,524,351 (243)

Fast Demagnetization and Vibration Reduction in Switched Reluctance Motor Drive System

IEEE Access, 2021
In this paper, a Switched Reluctance Motor (SRM) drive system is proposed to make a trade-off between torque profile and vibration amplitude. In the proposed drive system, the power factor correction and fast demagnetization are achieved using a single ...
Zahra Sadeghi, Sayed Morteza Saghaian Nejad, Amir Rashidi, Mahdi Shahparasti   +3 more
doaj   +3 more sources

Experimental test of the cooling rate effect on blocking temperatures in stepwise thermal demagnetization [PDF]

Geophysical Journal International, 2020
SUMMARYUpon cooling, most rocks acquire a thermoremanent magnetization (TRM); the cooling rate at which this happens not only affects palaeointensity estimates, but also their unblocking temperatures in stepwise thermal demagnetization experiments, which is important, for example, to estimate volcanic emplacement temperatures. Traditional single-domain
Thomas A Berndt, Liao Chang, Greig A Paterson, Changqian Cao   +3 more
semanticscholar   +3 more sources

Research on Demagnetization Fault Diagnosis Method of Mine Cutting Permanent Magnet Synchronous Motor

International Journal of Rotating Machinery
To give timely and accurate diagnosis in the early stage of demagnetization failure for effective control and treatment, based on wavelet packet analysis, principal component analysis (PCA) dimensionality reduction, and least squares support vector ...
Guo Ye, Yanbin Lu, Jinyong Ju, Lianchao Sheng   +3 more
doaj   +3 more sources

Enhancement of ultrafast demagnetization rate and Gilbert damping driven by femtosecond laser-induced spin currents in Fe81Ga19/Ir20Mn80 bilayers [PDF]

Physical Review B, 2019
In spintronics applications, ultrafast spin dynamics have to be controlled at femtosecond (fs) timescales via fs-laser radiation. At such ultrafast timescales, the effect of the Gilbert damping factor α on ultrafast demagnetization time should be considered.
Zhang, Wei, Liu, Qian, Yuan, Zhe, Xia, Ke, He, Wei, Zhan, Qing-feng, Zhang, Xiang-qun, Cheng, Zhao-hua   +7 more
semanticscholar   +5 more sources

Dynamic demagnetization experiment on China-Russia Eastern Gas Pipeline

You-qi chuyun, 2022
The residual magnetism produced during the construction and inspection of long-distance oil and gas pipelines can cause the magnetic blow of welding arc, which may affect the welding progress and quality of pipelines and even threaten their intrinsic ...
Wenbo XUAN, Weibin WANG, Shihao JIA, Hong ZHAO, Honghui QIU, Tingting WU   +5 more
doaj   +2 more sources

Ultrafast Demagnetization of Iron Induced by Optical versus Terahertz Pulses [PDF]

Physical Review X, 2021
We study ultrafast magnetization quenching of ferromagnetic iron following excitation by an optical versus a terahertz pump pulse. While the optical pump (photon energy of 3.1 eV) induces a strongly nonthermal electron distribution, terahertz excitation (
A. L. Chekhov, Y. Behovits, J. J. F. Heitz, C. Denker, D. A. Reiss, M. Wolf, M. Weinelt, P. W. Brouwer, M. Münzenberg, T. Kampfrath   +9 more
doaj   +2 more sources

Optimal Design of Spoke-Type IPM Motor Allowing Irreversible Demagnetization to Minimize PM Weight

IEEE Access, 2021
In this study, we introduce an optimal design for a spoke-type interior permanent magnet (IPM) motor that can minimize PM weight by allowing irreversible demagnetization, unlike the conventional motor design method that does not allow irreversible ...
Keun-Young Yoon, Kyu-Yun Hwang
doaj   +2 more sources

Irreversible Demagnetization Improvement Process of Hybrid Traction Motors with Dy-Free Magnets

Machines, 2022
Permanent magnet synchronous motors (PMSMs), with their high power density, high efficiency, and thermal stability, are widely used nowadays. PMSM magnets are composed of rare earth elements.
Si-Woo Song, Hyun-Jo Pyo, Dong-Woo Nam, Ju Lee, Won-Ho Kim   +4 more
doaj   +2 more sources

Spin-orbit enhanced demagnetization rate in Co/Pt-multilayers

Applied Physics Letters, 2014
In order to explore the role of enhanced spin-orbit interactions on the laser-induced ultrafast magnetization dynamics, we performed a comparative study on cobalt thin films and Co/Pt multilayers. We show that the presence of the Co/Pt interfaces gives rise to a three-fold faster demagnetization upon femtosecond laser heating.
Kuiper, K.C., Roth, T., Schellekens, A.J., Schmitt, O., Koopmans, B., Cinchetti, M., Aeschlimann, M.   +6 more
openaire   +3 more sources

Multi-Objective Optimization of Permanent Magnet Synchronous Motor for Electric Vehicle Considering Demagnetization

Applied Sciences, 2021
The irreversible demagnetization of permanent magnets causes the deterioration of the performance in permanent magnet synchronous motors (PMSMs), which are used for electric vehicles.
Yong-min You, Keun-young Yoon
doaj   +2 more sources