A5100673419- Electric Motor Design and Analysis
- Magnetic Bearings and Levitation Dynamics
- High voltage insulation and dielectric phenomena
- Magnetic Properties and Applications
- Superconducting Materials and Applications
- Plasma Diagnostics and Applications
- Adhesion, Friction, and Surface Interactions
- Laser-induced spectroscopy and plasma
- Physics of Superconductivity and Magnetism
- Power Transformer Diagnostics and Insulation
- Graphene research and applications
- Characterization and Applications of Magnetic Nanoparticles
- Carbon Nanotubes in Composites
- Thermal Analysis in Power Transmission
- Micro and Nano Robotics
- Supercapacitor Materials and Fabrication
- Laser Material Processing Techniques
- Vibration and Dynamic Analysis
- Radio Frequency Integrated Circuit Design
- Advancements in PLL and VCO Technologies
- HVDC Systems and Fault Protection
- Lightning and Electromagnetic Phenomena
- Catalysts for Methane Reforming
- Mine drainage and remediation techniques
- Geomechanics and Mining Engineering
Hanyang University
2003-2025
High Temperature Superconducting (HTS) synchronous motors consist mainly of rotational (HTS coil) and stationery (copper parts. The HTS coil running at a speed is not influenced by the magnetic field generated stator but affected considerably initial or transient operation. Therefore, computational analysis to determine optimal design damper an important factor in protecting motor. This paper presents parameters for 5 MW motor using characteristics current, which proportional alternating coil.
This work is development activities of HTS motor at DOOSAN heavy industry and Korea Electrotechnology Research Institute in Korea, sponsored by DAPAS program which supported Korean government. The final aim the project realization field such as large driving pumps, fans compressors for utility industrial environments. At present time, 1MW developed purpose to fully represent design manufacturing issues larger capacity machine. machine 2 pole 3,600rpm, all components are completely...
This research presents a finite element method to analyze the electromechanical coupled field of hydrodynamic-bearing (HDB) spindle motor computer hard disk drives considering electromagnetics, thermal analysis, HDB, and rotor dynamics investigate coupling effect. Simulation results are verified by experiments, it shows that is essential include appropriate fields predict performance accurately. also investigates characteristics HDB due
This research presents a finite element method to analyze the electromechanical field of hydrodynamic-bearing (HDB) spindle motor computer hard disk drives at elevated temperature. Magnetic is analyzed by nonlinear time-stepping considering switching action PWM inverter, and magnetic force torque are calculated Maxwell stress tensor. Mechanical motion rotor determined Newton's equation motion, in which hydrodynamic bearing friction solving Reynolds equation. Both analyses mechanical combined...
This paper presents an octa-phase LC VCO for a multi-band direct conversion receiver. To obtain the signal and low phase noise characteristic, four identical VCOs are connected by using series coupling transistors. For application, band tuning circuit that is composed of switch capacitor two MOS varactors proposed. Using varactors, can be immune to process variation oscillation frequency. Designed in 0.18 μm CMOS technology, consumes 9.52mA current from 1.8V supply voltage operates with...
This article proposes a rapid and optimum design method that considers axial flux leakage for coaxial magnetic gear (CMG). Conventional CMG methods perform two-dimensional (2D) finite element analysis (FEA) to evade the long computational time of three-dimensional (3D) FEA. However, conventional do not consider are therefore less accurate than computationally exhaustive through 3D Therefore, as an alternative reduce time, this predicting performance combining correlation coefficients 2D FEA...
Mechanical gears are widely used because they allow traction motors with high efficiency at speed and low torque to be driven performance torque. The friction of mechanical gears, however, causes noise vibration requires maintenance due wear. Coaxial magnetic (CMGs) can overcome the problems by transmitting without physical contact, but their heavy use rare earth permanent magnets (PMs) has been an obstacle in face unstable supply price PMs. To reduce dependence on PMs increase cost...
본 연구는 대학 과학영재교육원에 소속된 중학교 학생들을 대상으로 수행한 사사과정의 일환으로 수행되었다. 연구에서는 전 세계 12 지역의 1966년부터 2015년 까지 최근 50년 동안의 검조소 자료에 대하여 선형 회귀 결과를 계산하고, 이를 근거로 전례 없는 기후 시기의 출현 시점을 예측하였다. 분석 결과 현재로부터 평균 205년 (최소 110년에서 430년 사이) 후에는 시기가 도래할 것으로 예상되었다. 또한 각 침수 가능 시기를 추가로 제시함으로써, 학생들이 지구 온난화와 관련된 해수면 상승 및 변화의 심각성을 인지하는 데 도움을 줄 수 있을 것이라고 평가된다.This research was conducted as a part of mentorship program with middle school students belong to university science education institute for the gifted. In this study, linear...
We have investigated the synthesis and field emission properties of high-quality double-walled carbon nanotubes (DWCNTs) using a catalytic chemical vapor deposition method. For DWCNTs CVD method, we used various containing molecules such as methane, ethylene, THF propanol over Fe-Mo embedded MgO support material. The produced materials method indicated high-purity DWCNT bundles free amorphous covering on surface. showed low turn-on voltage higher stability compared with SWCNTs.
This research develops an experimental method to measure the motion of a FDB spindle system with 3.5' disk by using three capacitance probes fixed on xyz-micrometers, and it shows that has whirling, flying tilting motion. It also converge very quickly steady state at same time when rotor reaches steady-state speed. However, they are quite large even compared 10nm height magnetic head. For used in this experiment, whirl radius peak-to-peak variation angle speed 7,200rpm 0.675m, 30nm...