A5101486629- Electric Motor Design and Analysis
- Magnetic Properties and Applications
- Magnetic Bearings and Levitation Dynamics
- Cardiac Arrhythmias and Treatments
- Induction Heating and Inverter Technology
- Coronary Interventions and Diagnostics
- Cardiovascular Function and Risk Factors
- Sensorless Control of Electric Motors
- Antiplatelet Therapy and Cardiovascular Diseases
- Acute Myocardial Infarction Research
- Cardiac pacing and defibrillation studies
- Cardiac Structural Anomalies and Repair
- Advanced MRI Techniques and Applications
- Microwave Dielectric Ceramics Synthesis
- Vascular Procedures and Complications
- Non-Destructive Testing Techniques
- Multilevel Inverters and Converters
- Cardiac electrophysiology and arrhythmias
- Magnetic properties of thin films
- Metallurgy and Material Forming
- Engineering Applied Research
- Cardiac Imaging and Diagnostics
- Cardiac Valve Diseases and Treatments
- Topology Optimization in Engineering
- Electromagnetic Simulation and Numerical Methods
Sungkyunkwan University
2015-2018
Chosun University
2016
Seoul National University
1997-2012
Dongguk University Ilsan Hospital
2012
Severance Hospital
2012
Seoul National University Hospital
2010-2012
Samsung Medical Center
2010
Gyeongsang National University
2009
In this study, we dealt with the design and characteristics of an outer-rotor type motor applied for blower system a vehicle according to brushless dc (BLDCM) ac (BLACM) through finite element analysis (FEA). order guarantee proper back electromotive force (BEMF) waveforms each model, 8-pole/12-slot 16-pole/12-slot types were BLDCM BLACM, respectively. Furthermore, designed analyzed all models based on 3-D FEA consider effect end-plate rotor core. As result, BLACM was verified as having...
Maximal hyperemia is a prerequisite for the accurate measurement of fractional flow reserve (FFR). Although continuous infusion adenosine via femoral vein considered to be gold standard, this requires an additional invasive procedure access and difficult use during transradial coronary catheterization. We performed prospective study evaluate feasibility efficacy peripheral intravenous FFR measurement.Seventy-one patients were prospectively enrolled, was measured using 0.014-inch pressure...
The effects of left ventricular (LV) loading conditions on LV dyssynchrony have not been elucidated. We modified to reveal their echocardiography-derived index (LVdys) in patients with documented nonischemic dilated cardiomyopathy.Thirty-seven were consecutively enrolled. After baseline measurements, pneumatic compression the lower extremities (Pcom) was used increase afterload. Subsequently, sublingual nitroglycerin (SL-NG) administered modify preload. Conventional echocardiographic...
In this paper, the optimization for reduction of copper loss, iron and permanent magnet (PM) eddy current loss considering harmonics is carried out to improve thermal performance. The effect in terms performance confirmed through analysis using a lumped-parameter network (LPTN). First, optimal shape determined an automatic method that combines explorative particle swarm algorithm finite element analysis. Then, PM carrier are recalculated by inputting actual pulsewidth modulation current....
In this paper, an analytical method for predicting the rotor overhang (OH) effect is presented using two types of conformal mappings (CMs), which are r-θ and zr plane CMs. First, no-load air-gap flux density (AFD) a slotted air gap without OH determined rθ CM. Second, complex relative permeance (CRAP) in obtained by This helps taking into account. Finally, AFD gaps cylindrical coordinates derived from with CRAP along z-axis. The accuracy verified comparing results analysis those 3-D...
In this study, we address an electric power steering (EPS) motor using a T-shaped segmented stator-core. the case of EPS motors, cogging torque should be minimized. When stator-core is applied, however, manufacturing defects and error affect peak value periodicity. We performed 2D finite element analysis (FEA) in accordance with ideal non-ideal cases to compare analyze their effect. addition, magnetic equivalent circuit method was used verify variation. Finally, manufactured 6-pole/9-slot...
In this study, a characteristic analysis of irreversible demagnetization in brushless dc motors (BLDCMs) according to the winding connection type, wye, and delta, is conducted. Depending on excitation sequence inverter output current for each method, different characteristics are caused under equal-input-limit condition. However, contrast with ideal waveform, ripple inevitably occurs when pulse width modulation (PWM) control applied. case large ripple, could deteriorate due instantaneous...
In this paper, we dealt with the design and characteristics analysis of a 130 kW interior permanent magnet synchronous motor (IPMSM) through finite element for propulsion system an electric vehicle. flux-weakening control region IPMSM, six-step operation is considered to widen high-speed region. However, electromagnetic performance depends on input current condition, known as time harmonics. To verify its effect, first, implement two types method by simulink: one space vector pulse width...
In this paper, a novel global search algorithm, implementing principal component optimization (PCO) in combination with mesh adaptive direct (MADS) is proposed. The PCO based on analysis, widely used multivariate technique statistics, while MADS highly effective local implemented to find optima. Their integration reduces computation time and improves convergence reliability optimum. proposed algorithm verified via application of test function comparison conventional hybrid algorithms such as...
Optimal design of electric machines using finite-element analysis (FEA) necessitates too much computation time to maintain high accuracy. To reduce the and obtain a global optimum in multi-modal problems, this paper presents differing extent mesh adaptive direct search (DEMADS). The proposed algorithm is classified into three groups according poll searching frame size for assigning local searching. In particular, DEMADS shares information among solutions based on parallel multi-start...
In this study, we describe the design method of a Brush-less DC (BLDC) motor with delta winding connection. After designing connection model <TEX>$60^{\circ}$</TEX> flat-top region Back Electro-Motive Force (BEMF), an ideal current source analysis and voltage analysis, 6-step control, were conducted primarily employing Finite Element Method. addition, as controller, considered Current Regulator PI controller using Simulink for comparison torque characteristics. When input is controlled,...
We present an analytical method for applying conformal mapping to the notched geometry of a surface permanent magnet synchronous motor calculate cogging torque. First, complex relative air-gap permeance (CRAP) is calculated by multiplying CRAP slotted with notch sensitivity coefficient, which defined relation slot and shapes. Secondly, no-load flux density (AFD) derived from CRAPs air-gaps. Finally, torque AFD verified using 2D finite element analysis (FEA) result. A 4-pole 12-slot used herein.
Abstract Background: The role of electrocardiogram (ECG) is unclear for the longitudinal follow‐up patients who undergo corrective surgery isolated severe tricuspid regurgitation (TR). Hypothesis: This study sought to investigate usefulness changes in QRS duration ECG after TR predicting right ventricular (RV) reverse remodeling as determined by cardiac magnetic resonance imaging (CMR). Methods: We enrolled 30 consecutive (27 women, aged 57.8 ± 9.6 years) had undergone prior left‐sided valve...
As the brushless DC (BLDC) motor is getting widely used in industry, vehicle and home appliances, it necessary to design satisfy performance specification. But because of switching current signal, BLDC shows different performances ideal source analysis six-step voltage analysis. Actually, as derived by source, voltages more accurate compared with that In this paper, structural methodology considering response time phase suggested through comparative between two which designed concepts.
In general, motor is designed through a two-dimensional (2-D) Finite Element Analysis (FEA) for better accuracy. However, in the case of outer-rotor type motor, housing part to take function rotor at same time by using magnetic material. Therefore, design based on three-dimensional (3-D) FEA should be conducted essentially since 2-D analysis not capable considering end housing. For this reason, study suggests novel method that reflects 3-D effect model changing material property core have...
Optimal design of Permanent Magnet Synchronous Machine (PMSM) based on Finite Element Analysis (FEA) calls for huge computational time high accuracy. Therefore, it is essential to select appropriate optimization algorithm. This paper presents the principal component analysis with mesh adaptive direct search improve computation and reliability convergence global optimum. It verified through a benchmark function applied optimal PMSM minimization torque ripple FEA.