• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.2
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• pp.360-364
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• 2016

The rare earth output is concentrated in limited number of countries including China. Also the necessity for development of non-rare earth motor is getting signified due to the rapid increase of rare earth price and resource weaponizing policies. Non-rare earth motor is generally designed as spoke type PMSM (Permanent Magnet Synchronous Motor) in order to maximize the power density. Such spoke type PMSM has advantage in concentrating the flux but demonstrates lower efficiency compared to permanent magnet using Nd (Neodymium) permanent magnet. Therefore, applications with strong necessity for efficiency need rotor structure having improved efficiency compared to spoke type PMSM. Hence, this study suggested fan-shape type PMSM with somewhat lower power density but maximized efficiency. Fan-shape type PMSM is a rotor shape demonstrating outstanding reduction of iron loss compared to existing spoke type. Thus, this study analyzed the improvement of efficiency and reduction of loss arising from the suggested shape through parameter calculation.

• The Journal of the Korea institute of electronic communication sciences
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• v.17 no.4
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• pp.607-616
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• 2022

A new axial flux permanent magnet machine with soft magnetic composited cores is proposed for electric vehicle application in this paper. The windings and soft magnetic composited cores can be designed to form a very compact structure, and; thus, the torque density can be improved greatly. To obtain the a good flux concentrating ability, two toroidally wound internal stator machines are designed and analyzed, and the designed motor is with NdFeB magnet for high-performance electric vehicle application. The 3-D finite-element method is used to analyze the electromagnetic parameter and performance, for performance comparison, a commercial axial flux permanent magnet machine is used. The proposed motor reduced weight about 5.8%, produced torque higher than about 8Nm for existing motor.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.975-976
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• 2011

본 논문에서는 매입형 영구자석 동기전동기 회전자의 원심력에 따른 응력 분포를 분석하였다. 수치 해석 방법 중 유한요소법(FEM)을 이용하여 전동기의 응력 분포를 파악하였으며, 각각의 회전속도에 따른 Principal Stress와 Mises Stress을 비교하였다.

• 연구논문집
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• s.30
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• pp.159-168
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• 2000

In this research, MFL inspection system has been studied for the inspection of storage tank floor. The reference specimens having 20%, 40%, 60% and 80% slot's are fabricated using the carbon steel plates of a 6mm and 10mm thick. Powerful permanent magnets and Hall effect sensors are used to this application. Also, this paper presents a newly developed MFL scanning system. Conclusively, it is shown that our system is able to detect metal loss like a slot.

• Proceedings of the KIPE Conference
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• 2018.07a
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• pp.426-427
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• 2018

본 논문에서는 철손을 고려한 SPMSM(Surface mounted Permanent Magnet Synchronous Motor)의 모델로부터 출력 토크를 향상시킬 수 있도록 하는 개선된 MTPA(Maximum Torque Per Ampere) 제어 기법을 제안하였다. d축 전류를 0으로 사용하는 SPMSM의 기존 MTPA 제어 방식보다 철손을 고려한 MTPA 전류로 운전하는 제안된 방식이 더 큰 출력 토크를 얻을 수 있음을 800W PMSM에 대한 시뮬레이션을 통해 확인하였다.

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 2003.10a
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• pp.3-6
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• 2003

In this work the AC loss measurement setup based on an iron core background magnet, not used in a conventional one, has been successfully developed, To prove its validity, a round-robin test for the same Bi-2223 tape sample among three institutes has been done. The results show that test data from the developed setup well agree with losses measured at different institutes.

• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.705-707
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• 2003

The design of multi-domain that considers all components of the electromagnetic systems such as air, iron, magnet, and coil is investigated using the topology optimization, interpolation method, and FEM. The design sensitivity equation for the topology optimization is derived using the adjoint variable method and the continuum approach. The proposed method is applied to the topology optimization of C-core actuator.

• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.753-755
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• 2002

This paper presents the characteristic analysis by changing the shape and position of auxiliary pole core for Automotive stater motor. The brush contact resistance and mechanical loss calculated from the experimental data are used in characteristic analysis. The Finite Element Analysis Method(FEM) and 3D Equivalent Magnet Circuit Network(EMCN) are used for analysis. The validity of the proposed methods are verified by comparison of analysis results and experimental ones.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2004.04a
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• pp.347-353
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• 2004

Due to various advantages over the conventional linear motion device such as ball-screw, linear motors have been used in wide variety of industrial applications for years. Driven by increased demand for precision machine tools, the importance of high positioning accuracy, high stiffness and high thrust are greatly increasing. The merits of linear motor are high speed high acceleration and good positioning accuracy. In addiction, Linear motor for high qualify machine tool call for high thrust, high stiffness. In this paper, thrust ripple, detent force and thermal behavior are considered for the development of high performance linear motor whose thrust is up to 1,900N. This paper presents a comprehensive study for an iron core type linear motor characteristics that include the influence of PM position on thrust ripple by detent force and motor dynamics as well.

• Journal of Electrical Engineering and Technology
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• v.10 no.4
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• pp.1667-1673
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• 2015

The vibration and noise caused by the dynamic interaction between electromagnetic suspension and the linear synchronous motor stator beneath a flexible guideway remain problems in designing attractive Maglev trains. One possible method to reduce the sources of vibration is to minimize the detent force in the linear synchronous motor that creates variations in both lift force and thrust. This paper proposes lowering detent force by using separated core instead of single united core. The magnet is designed to adapt to the deflected guideway at a speed of 550km/h. This study will analyze the electromagnetic field and control performance, and how they relate to lift forces and dynamic responses.