Results 11 to 20 of about 11,992 (214)

Irreversible demagnetization mechanism of permanent magnets during electromagnetic buffering

Defence Technology, 2021
The permanent magnets will be irreversibly demagnetized under high temperature and high velocity during the electromagnetic buffering. In this study, the magnetic field induced by eddy currents and the self-demagnetizing field of permanent magnet are ...
Guolai Yang, Jia-Hao Li
exaly   +3 more sources

Demagnetization research on PMs in the Halbach magnetized pulsed alternator

CES Transactions on Electrical Machines and Systems, 2019
Demagnetization behavior of Halbach magnetized compensated pulsed alternator (CPA) is studied by using finite element method (FEM) under the different demagnetization factors in this paper.
Shumei Cui, Shaopeng Wu, Weiduo Zhao
exaly   +3 more sources

On-Line Detection of Demagnetization for Permanent Magnet Synchronous Motor via Flux Observer

Machines, 2022
Demagnetization in permanent magnet synchronous motor (PMSM), caused by high temperature or inverse magnetic field, may increase loss and torque ripple, and even degrade the system stability in severe cases.
Liqian Cao, Zhong Wu
doaj   +2 more sources

Demagnetization Severity Detection in Permanent Magnet Synchronous Motors Based on Temperature Signal and Convolutional Neural Network [PDF]

Sensors
To address the difficulty of detecting demagnetization severity in permanent magnet synchronous motors (PMSMs), this paper proposes a demagnetization severity detection method based on temperature signal and Convolutional Neural Network (CNN). First, the
Zhiqiang Wang, Shihao Yan, Haodong Sun, Xin Gu, Zhichen Lin, Kefei Zhu   +5 more
doaj   +2 more sources

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   +2 more sources

Pressure demagnetization: Electromagnetism meets thermodynamics

AIP Advances
By pressure demagnetization, take iron as an example, we mean either that, given an external magnetic field under a certain temperature, the magnetization becomes weaker as the pressure increases, which can be referred to as pressure demagnetization ...
S. F. Xiao, H. Zhao, Y. X. Wei, J. Z. Tan, Q. H. Liu   +4 more
doaj   +2 more sources

Failure Diagnosis of Demagnetization in Interior Permanent Magnet Synchronous Motors Using Vibration Characteristics

Applied Sciences, 2019
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).
Takeo Ishikawa, Naoto Igarashi
doaj   +2 more sources

Dependence of Demagnetization Quality of Ferromagnetic Bodies on Frequency Relationship and Duration of Demagnetization Process

Известия высших учебных заведений и энергетических объединенний СНГ: Энергетика, 2007
Experiments have revealed that demagnetization quality of ferromagnetic bodies depends on characteristics of demagnetizing field that are determined by their size and internal properties.
R. R. Moroz
doaj   +1 more source

Nanoscale Confinement Enhances Ultrafast Demagnetization. [PDF]

Adv Sci (Weinh)
Next generation spintronics may depend on successfully combining femtosecond spin dynamics with nanoscale device miniaturization. We address this by systematically studying the effect of nanoscale confinement on the femtosecond demagnetization of Iron. By combining ultrafast experiments sensitive to spins, charge carriers, and phonons, we uncover a nm ...
Windsor YW, Lojewski T, Kundu M, Sokolowski-Tinten K, Rothenbach N, Eschenlohr A, Gruner ME, Ollefs K, Schmitz-Antoniak C, Salamon S, Zahn D, Rettig L, Schüßler-Langeheine C, Pontius N, Li R, Mo M, Park S, Shen X, Weathersby S, Wang X, Pentcheva R, Wende H, Nowak U, Bovensiepen U.   +23 more
europepmc   +2 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   +1 more source