Anomalous eddy current loss and amorphous magnetic materials with low core loss (invited)

1981 ◽  
Vol 52 (3) ◽  
pp. 1893-1898 ◽  
Author(s):  
H. Fujimori ◽  
H. Yoshimoto ◽  
T. Masumoto ◽  
T. Mitera
Keyword(s):  
Magnetic Materials ◽  
Eddy Current ◽  
Core Loss ◽  
Eddy Current Loss ◽  
Current Loss ◽  
Amorphous Magnetic Materials

scholarly journals Interior Permanent Magnet Synchronous Motor Design for Eddy Current Loss Reduction in Permanent Magnets to Prevent Irreversible Demagnetization

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5082
Author(s):  
Jae-Woo Jung ◽  
Byeong-Hwa Lee ◽  
Kyu-Seob Kim ◽  
Sung-Il Kim
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
Permanent Magnets ◽  
Permanent Magnet Synchronous Motor ◽  
Core Loss ◽  
Synchronous Motor ◽  
Eddy Current Loss ◽  
Equivalent Circuit Analysis ◽  
Current Loss ◽  
Interior Permanent Magnet

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 cost consumption. Therefore, a method is proposed for indirectly calculating the eddy current loss of PMs using 2-D FEA. A thermal equivalent circuit analysis was used to calculate the PM temperature of the optimized model. For the thermal analysis, the copper loss, core loss, and eddy current loss in PMs were estimated and applied as a heat source. Based on the results, we confirmed the stability of the optimum model in terms of the PM demagnetization.

scholarly journals Emulating Full Load Testing of Air-cooled Nanocrystalline IHT at Zero Power

2021 ◽  
Author(s):  
Arun Paul
Keyword(s):  
Eddy Current ◽  
Core Loss ◽  
Load Condition ◽  
Eddy Current Loss ◽  
Test Facility ◽  
Load Testing ◽  
Prolonged Heating ◽  
Current Loss ◽  
Full Load ◽  
Run Test

High-power high-frequency air-cooled induction heating transformers, mostly used as current multiplier and isolation purposes, are custom designed. For their reliable performance and long life, the thermal evaluation at rated load is necessary. Creating an equivalent load as test facility for reliability testing of such type of transformer is difficult. Characteristics of such loads drastically change after Curie temperature. Moreover, prolonged heating could increase the nearby ambient temperature and, more importantly, the traditional heat run test wastes large amount of energy. Whenever the coil is energized, windings of transformer draw respective rated current; even at no load condition the copper loss is at rated value. While both windings drawing rated current at desired frequency, using the concept of localized eddy current loss as well as excess eddy current loss, this article proposes a novel method to inject requisite core loss to the magnetic circuit to emulate the characteristics of full load condition but the power drawn from the transformer would be zero. The proposed idea would be validated where only 200W resonant inverter would be used to inject power loss equivalent to full-load condition of 30 kW transformer to emulate the heat run test

scholarly journals Emulating Full Load Testing of Air-cooled Nanocrystalline IHT at Zero Power

2021 ◽  
Author(s):  
Arun Paul
Keyword(s):  
Eddy Current ◽  
Core Loss ◽  
Load Condition ◽  
Eddy Current Loss ◽  
Test Facility ◽  
Load Testing ◽  
Prolonged Heating ◽  
Current Loss ◽  
Full Load ◽  
Run Test

High-power high-frequency air-cooled induction heating transformers, mostly used as current multiplier and isolation purposes, are custom designed. For their reliable performance and long life, the thermal evaluation at rated load is necessary. Creating an equivalent load as test facility for reliability testing of such type of transformer is difficult. Characteristics of such loads drastically change after Curie temperature. Moreover, prolonged heating could increase the nearby ambient temperature and, more importantly, the traditional heat run test wastes large amount of energy. Whenever the coil is energized, windings of transformer draw respective rated current; even at no load condition the copper loss is at rated value. While both windings drawing rated current at desired frequency, using the concept of localized eddy current loss as well as excess eddy current loss, this article proposes a novel method to inject requisite core loss to the magnetic circuit to emulate the characteristics of full load condition but the power drawn from the transformer would be zero. The proposed idea would be validated where only 200W resonant inverter would be used to inject power loss equivalent to full-load condition of 30 kW transformer to emulate the heat run test

Estimation of Eddy-Current Loss for MnZn Ferrite Cores

2011 ◽  
Vol 382 ◽  
pp. 204-209 ◽  
Author(s):  
Hsiau Hsian Nien ◽  
Chuan Kuei Huang ◽  
Ming Yu Wang ◽  
Chih Wei Lin ◽  
Shih Kuen Changchien
Keyword(s):  
Eddy Current ◽  
Critical Role ◽  
Core Loss ◽  
Eddy Current Loss ◽  
Magnetic Flux Density ◽  
Magnetic Characteristics ◽  
Material System ◽  
Ferrite Core ◽  
Mnzn Ferrite ◽  
Current Loss

This paper proposes a new estimation for the eddy-current loss of MnZn ferrite cores. The eddy-current loss plays a critical role in the frequency range of 100-500 kHz, whereas the amount of the hysteresis loss dominates the core loss of magnetic devices below 100 kHz. However, the definition and calculation of eddy-current loss are not as easy or accurate. In the proposed estimation, the equivalent electrical circuit method is conducted for determining the grain conductivity and the driving current to replace the induced magnetic flux density in order to simplify measurement. The related electrical and magnetic characteristics are measured by an HP-4294 impedance analyzer. Finally, an EI30 (PC40 material system from TDK) MnZn ferrite core is used as an example to prove that this model can effectively estimate the eddy-current loss of MnZn ferrite cores at different frequencies and driving currents

scholarly journals Emulating Full Load Testing of Air-cooled Nanocrystalline IHT at Zero Power

2021 ◽  
Author(s):  
Arun Paul
Keyword(s):  
Eddy Current ◽  
Core Loss ◽  
Load Condition ◽  
Eddy Current Loss ◽  
Test Facility ◽  
Load Testing ◽  
Prolonged Heating ◽  
Current Loss ◽  
Full Load ◽  
Run Test

High-power high-frequency air-cooled induction heating transformers, mostly used as current multiplier and isolation purposes, are custom designed. For their reliable performance and long life, the thermal evaluation at rated load is necessary. Creating an equivalent load as test facility for reliability testing of such type of transformer is difficult. Characteristics of such loads drastically change after Curie temperature. Moreover, prolonged heating could increase the nearby ambient temperature and, more importantly, the traditional heat run test wastes large amount of energy. Whenever the coil is energized, windings of transformer draw respective rated current; even at no load condition the copper loss is at rated value. While both windings drawing rated current at desired frequency, using the concept of localized eddy current loss as well as excess eddy current loss, this article proposes a novel method to inject requisite core loss to the magnetic circuit to emulate the characteristics of full load condition but the power drawn from the transformer would be zero. The proposed idea would be validated where only 200 W resonant inverter would be used to inject power loss equivalent to full-load condition of 30 kW transformer to emulate the heat run test.

The FEM Calculation of Iron Loss in the Active Magnetic Bearing

2014 ◽  
Author(s):  
Peicai Wu ◽  
Xingnan Liu ◽  
Guojun Yang ◽  
Zhengang Shi
Keyword(s):  
Eddy Current ◽  
Power Loss ◽  
Core Loss ◽  
Eddy Current Loss ◽  
Magnetic Bearing ◽  
Silicon Steel ◽  
Hysteresis Loss ◽  
Active Magnetic Bearing ◽  
Iron Loss ◽  
Current Loss

The active magnetic bearing (AMB) is a new kind of high-performance bearing which suspends the rotor with controlled electromagnetic force. It was chosen to support the rotor of the helium blower in HTR-PM instead of conventional bearings. The power losses in the active magnetic bearings compose of three components: copper loss, iron loss and windage loss. In this paper, the iron loss, which composes of the eddy current loss and the hysteresis loss, is researched. The power loss of silicon steel lamination (35H300) was measured. Experimental data was taken over a range of 50Hz to 25,000Hz (sinusoidal current) for several magnetic field intensities. According to the experimental data, the eddy current loss and hysteresis loss increase with the frequency. And the hysteresis loss in the silicon steel lamination occupies the major part when the frequency of current is low, however the growth rate of eddy current is much faster than that of the hysteresis loss. And the FEM calculation of power loss in the magnetic bearing, which rotor and stator are made from silicon steel lamination (35H300), is also presented. The result shows the core loss of magnetic bearing also follow the separation theory. We can separate the core loss of magnetic bearing into two parts: hysteresis loss and eddy current loss. It will be very useful to calculate the power loss in the magnetic bearing.

scholarly journals Core loss analysis of soft magnetic composites considering the inter-particle eddy current loss

AIP Advances ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 015140
Author(s):  
Yiming Yang ◽  
Youhua Wang ◽  
Shipu Wu ◽  
Chengcheng Liu ◽  
Long Chen
Keyword(s):  
Eddy Current ◽  
Core Loss ◽  
Eddy Current Loss ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
Current Loss ◽  
Loss Analysis ◽  
Soft Magnetic Composites
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