고전압 착자기에서의 누전 사고 방지를 위한 광통신 제어시스템의 도입 방안과 경제성 분석

배영우,김우주,홍준석 한국데이터전략학회 2019 Journal of information technology applications & m Vol.26 No.6

Demand for high power motors is rapidly increasing as the 4th industry and convergence technology has recently emerged. In order to produce high-strength permanent magnets, the magnets used for magnetization have been increased from DC 300V in the 1970s to DC 2.5kV in the 2010s, Up to DC 10kV in the 2030s, It is expected that higher voltage will be used to magnetize. However, in the case of a magnetizer using an existing electric signal control device, it is necessary to use a control device with a high-voltage insulation function in case a high voltage used for magnetization is leaked to the control device. If a short circuit accident occurs, the controller must be shut down and serious problems such as excessive repair costs arise. In this study, a control system adopting optical communication method instead of electric signal control method is proposed to prevent leakage currents in high-voltage magnetizer. We design a transmitter(Tx) and a receiver(Rx) device for the optical communication control device and implemented a prototype connecting the optical cable. In order to demonstrate the utility of high-voltage magnetizer using the optical communication control device, we analyzed the initial cost and the yearly cost for the years to analyze the net present value. As a result, In the case of the low-voltage magnetizer, the electric signal control method cost less, As the operating voltage of the magnetizer becomes higher. It is confirmed that it takes less cost when the optical communication control device is used.

Spoke Type 전동기 및 착자기 최적설계

김영현(Young-Hyun Kim),이진경(Jin-Kyoung Lee),서준(Jun-Seo),이중호(Jung-Ho Lee) 대한전기학회 2016 전기학회논문지 Vol.65 No.2

This study proposes criteria for both optimal-shape and magnetizer-system designs to be used for a high-output spoke-type motor. The study also examines methods of reducing high-cogging torque and torque ripple, to prevent noise and vibration. The optimal design of the stator and rotor can be enhanced using both a response surface method and finite element method. In addition, a magnetizer system is optimally designed for the magnetization of permanent magnets for use in the motor. Finally, this study verifies that the proposed motor can efficiently replace interior permanent magnet synchronous motor in many industries.

2-D Field Analysis of Flat-type Motor

김필수,Kim, Pill-Soo Institute of Korean Electrical and Electronics Eng 1998 전기전자학회논문지 Vol.2 No.1

본 연구에서는 2차원 자계 해석 프로그램을 이용하여 평판형 브러시레스 직류 전동기의 자계 해석을 위한 방법을 제시하였다. 정확한 자계 해석을 위해서는 3차원 자계 해석이 필요하지만 많은 시간 및 비용이 요구되는 단점이 있다. 따라서 본 연구에서는 자계 해석을 위하여 3차원 문제를 해당 자석의 평균 반지름에 대한 원통방향의 단면으로 해석하여 2차원 경계치 문제로 축소시켰다. 본 방법을 이용할 경우 시스템의 크기 및 형태에 관계없이 정확한 2차원 자계해석 결과가 합리적으로 얻어지게 된다. This paper describes a method for field analysis inside the flat-type brushless DC motor using 2-D field simulator. Rigorous field analysis entail 3-D analysis. However, this analysis is not often appropriate for system designs because of the time and cost involved. For field analysis in this study, the 3-D problem is reduced to a 2-D boundary value problem by introducing a cylindrical cutting plane at the mean radius of the magnets. Independent of sizes and shapes of systems, the exact 2-D field results can be obtained with reasonable predictability.

조립 후 착자 공정을 고려한 컴프레서용 자속집중형 모터 특성 비교

박민로(Min-Ro Park),김규섭(Kyu-Seob Kim) 한국자기학회 2022 韓國磁氣學會誌 Vol.32 No.5

The number of devices using motors is increasing worldwide, and interest in permanent magnets, which are essential components of permanent magnet type synchronous motors with advantages of wide operating range and high power density, is increasing. In particular, rare-earth permanent magnets with high residual induction are used in various fields such as automobile driving motors , for example, EPS motors. However, due to the limited area in which rare earth elements exist, various problems such as supply-demand imbalance and price surges may occur. In response to this, various types of motors that do not use rare earth elements have been developed. In this paper, the characteristics of various types considering the magnetization process after assembly of the concentrated flux synchronous motor are reviewed, and through this, the design direction of the motor is suggested.

고용량 영구자석형 모터의 회전자 착자를 위한 200 kJ급 착자기의 착자요크 회로정수 설계 방법에 관한 연구

정민옥,이숭근,백권후,김태규 한국산업정보학회 2023 한국산업정보학회논문지 Vol.28 No.2

전기차 보급과 고성능화가 진행됨에 따라 높은 출력을 가지는 모터의 수요가 증가하고 고용량 IPMSM 생산을 위한 고용량 착자기의 중요성 또한 증가하고 있다. 착자에 중요한 착자 전류의 최댓값과 커패시터 방전시간은 착자요크의 회로정수에 의해 결정된다. 본 논문에서는 착자기 설계를 위한 착자요크의 회로정수 설계를 위하여 MATLAB SIMULINK를 활용한 착자 시스템의 해석을 진행하고 회로정수 설계를 위한 설계 절차를 제시한다. 그 결과 착자용량 5,000[V], 15,000[uF]에 따라 착자요크 파라미터는 0.015[ohm], 0.035[mH]로 도출하였다.

A Study on the Shape of Magnetizing Yoke to Reduce the Dead Zone of a Ring Magnet

Jeong-Yeon Min,Dong-Woo Nam,Min-Ki Hong,Na-Rim Jo,Won-Ho Kim 한국자기학회 2022 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2

회전수 감지용 자기장 제어씰의 신뢰성 향상을 위한 연구

박철우(C. W. Park),우종서(J. S. Woo),이부윤(B. Y. Lee) 한국정밀공학회 2017 한국정밀공학회 학술발표대회 논문집 Vol.2017 No.5월

Estimation Method of the Positions of Reinforcing Steel Bars by using Pulsed-Magnetization

Hori, Michitaka,Sana, Ryousuke,Komori, Mochimitsu 대한전기학회 2014 The Journal of International Council on Electrical Vol.4 No.4

Recently, the inspection of positions and depths of reinforcing steel bars in reinforced concrete structures is important. An electromagnetic induction method and an electromagnetic radiation radar method are used for inspection techniques of nondestructive. But, a general inspection technique also has the problem. Other techniques are actively researched now. Authors previously proposed a method of estimating position, depth and diameter of a single reinforcing steel bar by using the pulse-magnetization. In most cases reinforcing steel bars are usually found in more than one the reinforcing steel bars. Authors examined the method estimating the positions of reinforcing steel bars in more than one the reinforcing steel bars. The magnetization characteristic of the reinforcing steel bar was examined, Authors confirmed about the technique for estimating of the position of the reinforcing steel bar through the basic experiments and simulations, and report.

Power Generation Using Magnetic Nanofluids in Millimeter-Sized Channel With In-Phase Mode of Magnetization

In-Ho Kim,Jong-Chul Lee,Sangyoup Lee,Geun-Young Jeong,Se-Hee Lee IEEE 2015 IEEE transactions on magnetics Vol.51 No.11

<P>Magnetic nanofluids (MNFs) are an interesting energy harvesting source. In this paper, the flow energy harvesting was experimentally and numerically investigated in a millimeter-sized channel using an externally applied permanent magnet to control the magnetizing direction of the magnetic nanoparticles (MNPs). Oil- or water-based MNF includes a certain percentage of magnetized nanoparticles and has unique features that vary with the strength of the external electromagnetic field. When the MNF flows through a cross-sectional area of the coil loop, the electromotive force can be obtained by following Faraday's law, because the MNPs act as permanent magnets. When the MNFs are used for flow energy harvesting, the main issue is the in-phase mode alignment of the MNPs magnetization with the coil loop. Without the in-phase mode, the electric power cannot be generated, because the net magnetization of the MNF is zero. Most of the previous research works, however, have not considered it. Thus, to implement this mode, we proposed an externally applied magnetic field generated by a cylindrically shaped permanent magnet. Short and closed Teflon tubing with a 1.5 mm inner diameter, containing the MNF, was located inside long silicon tubing and moved along the positive and negative directions by a pump. Then, the generated voltages were measured, and exhibited similar results to those obtained analytically. In the same way, we calculated and experimentally tested a chain type of Teflon tubing.</P>

건식벨트형 자력선별에서 자성입자의 궤적모사

김범욱,전호석,박철현 한국자원공학회 2020 한국자원공학회지 Vol.57 No.1

Magnetic separation, which has been widely used in various industries (e.g., mineral and waste treatment) is an important part of mineral processing. In this study, the simulations of particle trajectories and the relationships between the main parameters in a dry belt-type magnetic separation system are presented. The magnetic field strength simulated by finite element analysis depended upon the vertical distance; the maximum strength was formed at a 0.31 m along the x-axis from a permanent magnet. Simulations of particle trajectories were conducted on ferromagnetic (magnetite), paramagnetic (ilmenite), and diamagnetic (quartz) materials, with variable parameters such as magnetic field strength, particle size, and degree of liberation. The simulation results showed that the key factors of magnetic susceptibility and field strength considerably affected the particle trajectory, as compared with particle size and specific gravity. Hence, the minimum magnetic field strength needed to separate magnetite and ilmenite could be obtained by the regression equation 자력선별법은 광물 및 폐기물 등 다양한 산업에서 활용되고 있는 광물처리의 중요한 분야이다. 본 논문에서는 건식벨트형 자력선별시스템에서 입자궤적을 모사하고 자력선별 주요변수간의 관계를 도출하고자 하였다. 자기장 모사는 유한요소해석 프로그램에 의해 수행되었고 주요 영향 변수는 수직이격 거리이었다. 최대 자기장세기는 영구자석로부터 X축의 0.31 m 지점에서 형성되었다. 입자궤적모사는 강자성(자철석), 상자성(티탄철석) 및 반자성(석영) 물질에 대해 자기장세기, 입자크기 및 단체분리도의 조건변화에 따라 수행되었다. 모사결과, 입자크기와 비중에비해 자화율과 자기장세기가 입자궤적에 영향을 미치는 주요 변수임을 확인하였다. 이로부터 자철석과 티탄철석을선별하기 위한 최소 자기장의 세기가 회귀식에 의해 도출되었다.