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영구자석의 자속을 고려한 영구자석 동기 전동기의 자속 포화 모델 및 자기 식별 방법
우태겸,윤영두 전력전자학회 2024 전력전자학회 논문지 Vol.29 No.1
This paper describes the flux saturation model and self-identification methods for flux saturation, considering the flux saturation phenomenon in a permanent magnet synchronous motor. The flux saturation data are obtained by injecting d-q axis voltages individually or simultaneously. Here, the d-axis self-saturation data can be obtained when only the d-axis voltage is injected. When only the q-axis voltage is injected, cross-saturation occurs because of the q-axis flux and the d-axis permanent magnet flux. Q-axis self-saturation data require generating a d-axis current, such that the d-axis flux becomes zero. However, this process can be difficult to execute depending on the system. configuration Thus, to solve this problem, this paper proposes a flux saturation model and estimation method that considers the cross-saturation effect of permanent magnets. The proposed algorithm was then verified using an 11kW IPMSM.
단일·이중소자를 이용한 자기결합 초전도 한류기의 자화특성 및 누적에너지 비교분석
최상재,김보희,임성훈,Choi, Sang-Jae,Kim, Bo-Hee,Lim, Sung-Hun 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.2
In this paper, the magnetization characteristics and the stored energy of magnetically coupled superconducting fault current limiter (SFCL)s using single and double high-Tc superconducting (HTSC) elements were compared. To analyze the magnetization characteristics and the stored energy, the magnetizing current and the flux linkage, which were derived from the electrical equivalent circuit of the SFCL using single and double HTSC elements, were calculated from the voltages and the current measured in the short-circuit tests. Through the comparative analysis on the magnetization characteristics and the stored energy for SFCL using sing and double HTSC elements, the magnetically coupled SFCL using double HTSC elements was shown to be more effective than the SFCL using single HTSC element from the point of view of the magnetic saturation.
Jian Gao,Chengxu Li,Wenjuan Zhang,Shoudao Huang 전력전자학회 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.12
This paper develops a method for permanent magnet (PM) temperature estimation in high power density permanent magnet synchronous machines (PMSMs) by considering magnetic saturation. Most of the previous methods in the literature are based on unsaturation. In this paper, the temperature estimation method of PMs is improved by adding a saturation coefficient. Once a machine is assembled, the inner and outer PM surfaces cannot be seen. Thus, it is impossible to realize visualization measurement of the permanent magnet temperature distribution. In this case, temperature sensors attached to the PM cam be used. However, the cost and robustness need to be considered. Therefore, in this paper, by solving a magnetic–thermal coupling finite element model, the temperature field distribution of a high power density PMSM is obtained. Then, an experimental platform is built to verify the model. Finally, the model is used to verify the reliability of the modified estimation method.
Observation of Perpendicular Magnetization Using CoFe/Pd Multilayers
Jin Seock Ma,Hyun Cheol Koo,Jongwha Eom,Joonyeon Chang,Suk-Hee Han,Chulwoo Kim 대한금속재료학회(구 대한금속학회) 2007 ELECTRONIC MATERIALS LETTERS Vol.3 No.2
Perpendicular magnetization using CoFe/Pd multilayers is presented. The magnetic behaviors of perpendicular and horizontal direction do not follow the conventional demagnetizing factor theory. The interfacial anisotropy is attributed to the perpendicular magnetization. A ferromagnetic layer is coupled with other ferromagnetic layers, so a thicker Pd layer weakens the perpendicular magnetization. The small thickness changes of both the CoFe and Pd generate tremendous variation of perpendicular anisotropy. In addition, sputtering power also affects the magnetic property of multilayers.
Thickness Dependence on the Magnetism in Mo-Capped Epitaxial Fe Films
Hyeonjun Kong,Eun-Young Ahn,Gowoon Kim,Sangkyun Ryu,Sungkyun Park,Hyoungjeen Jeen,Tae-Yeol Jeon,Younghak Kim,Jin Hyung Cho 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.5
When magnetic metal films are oxidized, in many cases, their saturation magnetization values decrease. The importance of high magnetization is well-known because it is directly related to the maximum energy product. Thus, prevention of oxidation in magnetic metal films via capping is important not only for studying the magnetism in magnetic metal films but also for developing new packaging technology for such films. In this research, we successfully grow epitaxial (110) Fe lms on (0001) Al2O3 substrates by using radio-frequency (RF) magnetron sputtering. We capped 10-nm-thick Mo layers on the Fe films to prevent oxidation. By varying the thickness of the films, we systematically observed the changes in both the coercivity and the saturation magnetization. Especially, when the film's thickness was below 8.5 nm, the coercivity of the film started to decrease. We believe the drastic change in the coercivity appeared in the Fe films when the film's thickness approached the critical domain size for a magnetic domain transition.
Evaluation of GMR Saturation for High Current Estimation
O. Elmatboly,A. Homaifar,M. KeshavarzTalebi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Here, an economic, non-intrusive, magnetic-field micro-sensor that is previously proposed and tested to estimate the high load currents of electric utility’s power system elements is under scrutiny again. This issue isaddressing specific computational analysis of the magnetic saturation problems in the modern micro-sensors that result from the large magnetic-fields generated by high voltage power equipment, such as the transmission and distributionnetworks. In some previous issues, the experimentally exerted efforts have proven the concepts of this measurementmethod. A three-way control strategy is adapted to overcome the saturation problems in the proposed micro-sensor. A comparison of the most important features of the advanced magnetic-field micro-sensors available in the market-place today is also added to the efforts in order to show the advantages of this proposed methodology.
T. Ogawa,K. Seto,D. Hasegawa,H. T. Yang,H. Kura,M. Doi,M. Takahashi 한국자기학회 2011 Journal of Magnetics Vol.16 No.3
In order to obtain mono-dispersed Fe NPs with high saturation magnetization, quantitative analysis method to investigate the growth dynamics of the Fe NPs synthesized by a conventional thermal decomposition method has been developed. As a result, fast nucleation process promotes formation of ~4 ㎚ of initial nucleus with a non-equilibrium phase, resulting in low saturation magnetization. And slow particle growth with atomic-scaled surface precipitation mode (< 100 atoms/(minㆍ㎚²)) can form the growth layer on the surface of initial nucleus with high saturation magnetization (~190 emu/gFe) as an equilibrium a phase of Fe. Therefore, higher stabilization of small initial nucleus generated just after the injection of Fe(CO)? should be one of the key issues to achieve much higher Ms of Fe NPs.
Active Cancellation of PMSM Torque Ripple Caused by Magnetic Saturation for EPS Applications
이근호 전력전자학회 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.2
This paper deals with a control method to reduce the torque ripple of a permanent magnet synchronous motor (PMSM) for electric power steering (EPS) systems. Such an application requires a very low torque ripple in order to maintain a good steering feel. However, because of spatial limitations, it cannot help having a partial saturation in the iron core of the PMSM for an EPS system, and this saturation results in a significant torque ripple. Thus, this paper analyzes the torque ripple caused by the magnetic saturation of a PMSM and proposes a method with respect to inductance measurement to verify the partial saturation. In addition,it is shown that a compensation current is needed in order to minimize the torque ripple when a PMSM is driven in the high torque region. The estimation process of the current and the torque ripple decreased by the current are presented and verified with test results.
자기 포화와 누설자속이 고려된 자기등가회로법을 이용한 클로우 폴 스테핑 모터의 요크 형상 설계
이형우(Hyung-Woo Lee),조수연(Su-Yeon Cho),배재남(Jae-Nam Bae),손병욱(Byoung-Ook Son),박경진(Kyoung-Jin Park),이주(Ju Lee) 대한전기학회 2009 전기학회논문지 Vol.58 No.10
This paper presents a shape design process of Claw-Poles Stepping Motor(CPSM) using Modified Magnetic Equivalent Circuit Method(MMEC). Because this motor is adopted on low power devices, the motor size is a very small type. But it have a very strong permanent magnet. So magnetic saturation effect happens on yoke teeth of CPSM. Also this magnetic saturation effect causes more leakage flux component between yoke tooth have another pole. In this motor type, it is essential to design a shape of yoke teeth for avoiding the magnetic saturation effect and the leakage flux. In this paper, MMEC including the magnetic saturation effect and the leakage flux component was used for design process. Comparing with data calculated by using the MMEC and results analyzed by 3-D FEM, it could be stated that the design process with MMEC was reasonable. Finally, the model has the optimized shape of yoke teeth was compared with a conventional model for no-load Back EMF and torque at steady-state operation.
Active Cancellation of PMSM Torque Ripple Caused by Magnetic Saturation for EPS Applications
Lee, Geun-Ho The Korean Institute of Power Electronics 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.2
This paper deals with a control method to reduce the torque ripple of a permanent magnet synchronous motor (PMSM) for electric power steering (EPS) systems. Such an application requires a very low torque ripple in order to maintain a good steering feel. However, because of spatial limitations, it cannot help having a partial saturation in the iron core of the PMSM for an EPS system, and this saturation results in a significant torque ripple. Thus, this paper analyzes the torque ripple caused by the magnetic saturation of a PMSM and proposes a method with respect to inductance measurement to verify the partial saturation. In addition, it is shown that a compensation current is needed in order to minimize the torque ripple when a PMSM is driven in the high torque region. The estimation process of the current and the torque ripple decreased by the current are presented and verified with test results.