Effect of the Thickness of Cr Interlayer on the High-Frequency Characteristics of FeCoTa/Cr/FeCoTa Multilayers

2011 ◽  
Vol 287-290 ◽  
pp. 1356-1359
Author(s):  
Shan Dong Li ◽  
Feng Xu ◽  
Ming Liu ◽  
Yi Hu ◽  
Jian Peng Wu ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Eddy Current ◽  
High Frequency ◽  
Anisotropy Field ◽  
Eddy Current Loss ◽  
Film Sample ◽  
Current Loss ◽  
Ferromagnetic Layers ◽  
Magnetic Decoupling ◽  
Ferromagnetic Resonance Frequency

The effect of non-ferromagnetic Cr interlayer on the high-frequency ferromagnetic properties (HFFMPs) was investigated by use of FeCoTa/Cr/ FeCoTa triple layered films. In conventional thought, the metal interlayer gives rise to a high eddy current loss and therefore a deteriorated HFFMP. However, it is found that HFFMPs depend on the thickness of Cr interlayer. The HFFPMs are improved by Cr-interlayer with a thickness less than 12 nm (sample C1). Comparing with the Cr-interlayer-free FeCoHf single layered film (sample C0), the magnetic anisotropy field of C1 dramatically increases from 185 Oe for C0 to 558 Oe for C1. As a consequence, a high ferromagnetic resonance frequency over than 3 GHz is achieved for sample C1. When the thickness of Cr-interlayer is more than 120 nm (C2), the HFFMPs are reduced due to the increase of eddy current loss and magnetic decoupling between the ferromagnetic layers.

scholarly journals Prediction of 3-D High-Frequency Eddy Current Loss in Rotor Magnets of SPM Machines

2016 ◽  
Vol 52 (9) ◽  
pp. 1-10 ◽  
Author(s):  
Sreeju S. Nair ◽  
Jiabin Wang ◽  
Liang Chen ◽  
Robert Chin ◽  
Iakovos Manolas ◽  
...  
Keyword(s):  
Eddy Current ◽  
High Frequency ◽  
Eddy Current Loss ◽  
Current Loss

Core Losses Separation of Amorphous Alloy Core

2016 ◽  
Vol 849 ◽  
pp. 91-94
Author(s):  
Shan Hong Li ◽  
Li Jun Li ◽  
De Ren Li ◽  
Zhi Chao Lu
Keyword(s):  
Amorphous Alloy ◽  
Eddy Current ◽  
High Frequency ◽  
Low Frequency ◽  
Eddy Current Loss ◽  
Hysteresis Loss ◽  
Frequency Range ◽  
Current Loss ◽  
Core Losses ◽  
Additional Loss

In this paper, the core losses of Fe80Si9B11, Fe78Si9B13 amorphous alloy cores were separated to investigate the behaviors of hysteresis loss, eddy current loss and additional loss in high frequency range. The results showed that the losses of amorphous alloy core were mainly composed of hysteresis loss in low frequency. With the increase of frequency, eddy current loss increased drastically compared with the hysteresis loss, the eddy current loss was greater than the hysteresis loss when the frequency was higher than 5 kHz and 6 kHz for amorphous alloy with the composition of Fe78Si9B13 and Fe80Si9B11, respectively. The eddy current loss proportion in total loss increased with the increment of frequency.

Three-dimensional optimization of meander inductor

2020 ◽  
Vol 64 (1-4) ◽  
pp. 343-350
Author(s):  
Takahiro Sasaki ◽  
Hajime Igarashi
Keyword(s):  
Eddy Current ◽  
High Frequency ◽  
Three Dimensional ◽  
Optimization Method ◽  
Magnetic Core ◽  
Eddy Current Loss ◽  
Current Loss ◽  
Micro Genetic Algorithm ◽  
Meander Line ◽  
Dimensional Optimization

This paper presents a three-dimensional optimization method of a meander inductor for high-frequency circuits. The proposed method determines the structure of the meander line using the micro-genetic algorithm in which the eddy current loss and inductance are evaluated by finite element method. It is shown that the total loss composed of the eddy current loss in the magnetic core and Joule loss in the meander line is successfully minimized keeping the inductance to the specified value by this optimization.

Performance analysis of magnetic gear with Halbach array for high power and high speed

2020 ◽  
Vol 64 (1-4) ◽  
pp. 959-967
Author(s):  
Se-Yeong Kim ◽  
Tae-Woo Lee ◽  
Yon-Do Chun ◽  
Do-Kwan Hong
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
High Power ◽  
High Speed ◽  
Torque Ripple ◽  
Eddy Current Loss ◽  
Element Analysis ◽  
Current Loss ◽  
Halbach Array ◽  
Magnetic Gear

In this study, we propose a non-contact 80 kW, 60,000 rpm coaxial magnetic gear (CMG) model for high speed and high power applications. Two models with the same power but different radial and axial sizes were optimized using response surface methodology. Both models employed a Halbach array to increase torque. Also, an edge fillet was applied to the radial magnetized permanent magnet to reduce torque ripple, and an axial gap was applied to the permanent magnet with a radial gap to reduce eddy current loss. The models were analyzed using 2-D and 3-D finite element analysis. The torque, torque ripple and eddy current loss were compared in both models according to the materials used, including Sm2Co17, NdFeBs (N42SH, N48SH). Also, the structural stability of the pole piece structure was investigated by forced vibration analysis. Critical speed results from rotordynamics analysis are also presented.

Development of Interior Permanent Magnet Motors with Concentrated Windings for Reducing Magnet Eddy Current Loss

2009 ◽  
Vol 129 (11) ◽  
pp. 1022-1029 ◽  
Author(s):  
Katsumi Yamazaki ◽  
Yuji Kanou ◽  
Yu Fukushima ◽  
Shunji Ohki ◽  
Akira Nezu ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
Eddy Current Loss ◽  
Permanent Magnet Motors ◽  
Current Loss ◽  
Interior Permanent Magnet
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