Yon‐Do Chun
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View article: Feasibility study of rare earth free electrically-excited machine technology for EV powertrain: Electromagnetic-Thermal performance evaluation with model-based design approach
Feasibility study of rare earth free electrically-excited machine technology for EV powertrain: Electromagnetic-Thermal performance evaluation with model-based design approach Open
This study investigates the feasibility of rare-earth-free electric machine technologies for electric vehicle powertrains by comparing the electromagnetic and thermal performance of an electrically excited synchronous machine (EESM) and an…
View article: Feasibility Study of Carbon Nanotube Winding for Permanent Magnet Synchronous Generator Considering Coupled Electromagnetic- Thermal Aspects
Feasibility Study of Carbon Nanotube Winding for Permanent Magnet Synchronous Generator Considering Coupled Electromagnetic- Thermal Aspects Open
The increasing demand for lightweight, high-efficiency electrical machines has driven research into copper-carbon nanotube (Cu-CNT) composites as alternatives to copper windings. While Cu-CNT-based conductors show promise, their bi-directi…
View article: A Study on New Straight Shape Design to Reduce Cogging Torque of Small Wind Power Generator
A Study on New Straight Shape Design to Reduce Cogging Torque of Small Wind Power Generator Open
In this paper, a 150 W small wind power generator which has a permanent magnet synchronous generator type is proposed with a new straight shape stator and rotor to reduce the cogging torque. The advantages of the proposed structure are int…
View article: A Study on New Straight Shape Design to Reduce Cogging Torque of Small Wind Power Generator
A Study on New Straight Shape Design to Reduce Cogging Torque of Small Wind Power Generator Open
In this paper, a small wind power generator is proposed with a new straight shape stator and rotor. The advantages of the proposed structure are introduced through a comparison between the basic and the proposed models. By comparing the po…
View article: Bi-directional coupled electro-thermal behaviors of traction motor for high-speed railway distributed traction system
Bi-directional coupled electro-thermal behaviors of traction motor for high-speed railway distributed traction system Open
This research proposes a bi-directional electromagnetic-thermal coupled analysis model based on node-to-node data transfer for a totally enclosed air over (TEAO) permanent magnet synchronous motor (PMSM) for a high-speed train (HST) distri…
View article: System-Level Consideration and Multiphysics Design of Propulsion Motor for Fully Electrified Battery Powered Car Ferry Propulsion System
System-Level Consideration and Multiphysics Design of Propulsion Motor for Fully Electrified Battery Powered Car Ferry Propulsion System Open
The Korean government is facing growing concern over the increasing levels of fine dust. A significant contribution to this problem comes from coastal vessels. To mitigate this, an electric ship propulsion system has been proposed as a sol…
View article: Numerical Analysis via Mixed Inverse Hydrodynamic Lubrication Theory of Reciprocating Rubber Seal Considering the Friction Thermal Effect
Numerical Analysis via Mixed Inverse Hydrodynamic Lubrication Theory of Reciprocating Rubber Seal Considering the Friction Thermal Effect Open
This study investigates how operating conditions such as ambient temperature and sealing pressure affect sealing performance for a typical U-cup seal. The developed analysis method combines inverse fluid lubrication (IHL) theory and the Gr…
View article: Thermal Preload for Predicting Performance Change Due to Pad Thermal Deformation of Tilting Pad Journal Bearing
Thermal Preload for Predicting Performance Change Due to Pad Thermal Deformation of Tilting Pad Journal Bearing Open
Thermal deformation of journal bearings operating under high-temperature conditions can have a significant effect on changes in bearing performance. However, no attempt has been made to quantify this amount of thermal deformation and link …
View article: Quasi-Static Sliding Wear Analysis of 3D Rough Surface Considering Changes in the Point of Contact
Quasi-Static Sliding Wear Analysis of 3D Rough Surface Considering Changes in the Point of Contact Open
This study analyzed adhesive wear in periodic sliding motion using a quasi-static deterministic wear model that considered changes in the point of contact of asperities as well as changes in the surface and statistical parameters. The cont…
View article: Design of a 120 W Electromagnetic Shock Absorber for Motorcycle Applications
Design of a 120 W Electromagnetic Shock Absorber for Motorcycle Applications Open
Based on the shock absorber size and power and power density limitations in motorcycle application, a linear permanent magnet machine for a regenerative suspension system that recovers the kinetic energy originating from shock absorber vib…
View article: FE-Aided Synchronization Analysis of Line-Start Synchronous Reluctance Motors
FE-Aided Synchronization Analysis of Line-Start Synchronous Reluctance Motors Open
Since line-start synchronous permanent magnet motors (LSPMs) entered the market, they have attracted research interest toward counterpart induction motors of low power-ratings. This paper reports an investigation of line-start synchronous …
View article: An Energy-Harvesting System Using MPPT at Shock Absorber for Electric Vehicles
An Energy-Harvesting System Using MPPT at Shock Absorber for Electric Vehicles Open
This paper investigates an energy-harvesting system that uses of vibration energy at a shock absorber for electric vehicles. This system mainly comprises a linear electromagnetic generator and synchronous buck converter. To obtain the elec…
View article: Mechanical Cutting Effect of Electrical Steel on the Performance of Induction Motors
Mechanical Cutting Effect of Electrical Steel on the Performance of Induction Motors Open
This paper investigates the mechanical cutting effect on the performance of induction motors. Numerical modeling of cutting effect is described in this paper. The approach inverts the degradation of the permeability model for inclusion of …
View article: A Study on the Rotor Design of Line Start Synchronous Reluctance Motor for IE4 Efficiency and Improving Power Factor
A Study on the Rotor Design of Line Start Synchronous Reluctance Motor for IE4 Efficiency and Improving Power Factor Open
As international regulations of motor efficiency are strengthened, the line-start synchronous reluctance motor (LS-SynRM) is being studied to improve the efficiency of the electrical motor in industrial applications. However, in industrial…
View article: Force Reduction in a Short-Stroke Vibration Tubular Generator for Vehicle Energy Harvesting Application
Force Reduction in a Short-Stroke Vibration Tubular Generator for Vehicle Energy Harvesting Application Open
This paper examines methods to reduce the detent force and electromagnetic force in a short-stroke vibration tubular generator used to harvest energy from a vehicle suspension system but still achieve the design targets of power and power …
View article: Comparison of Dual-Permanent-Magnet-Excited Machines and Surface-Mounted Permanent Magnet Machines in Terms of Force
Comparison of Dual-Permanent-Magnet-Excited Machines and Surface-Mounted Permanent Magnet Machines in Terms of Force Open
In this paper, finite element analysis demonstrates the difference between dual-permanent-magnet-excited machines (DPMM) and surface-mounted permanent magnet machines (SPM) in terms of tangential force at the same air gap, diameter, stacki…
View article: Design of a High-Performance 16-Slot 8-Pole Electromagnetic Shock Absorber Using a Novel Permanent Magnet Structure
Design of a High-Performance 16-Slot 8-Pole Electromagnetic Shock Absorber Using a Novel Permanent Magnet Structure Open
The conventional development of tubular generators for applications intended to harvest energy using vehicle suspension systems is faced with the critical challenge of increasing the power harvested for a given space. Conventional optimal …
View article: Improvement of Tubular Permanent Magnet Machine Performance Using Dual-Segment Halbach Array
Improvement of Tubular Permanent Magnet Machine Performance Using Dual-Segment Halbach Array Open
In this paper, a modification of the dual-segment permanent magnet (PM) Halbach array is investigated to improve the performance of the tubular linear machine, in terms of flux density and output power. Instead of a classical Halbach array…
View article: Improvement of Tubular Permanent Magnet Machine Performance Using Dual-Segment Halbach Array
Improvement of Tubular Permanent Magnet Machine Performance Using Dual-Segment Halbach Array Open
In this paper, modification of dual-Halbach permanent magnet (PM) array is investigated to improve performance of tubular linear machine, in terms of flux density and output power. Instead of a classical Halbach array with only radial and …
View article: Linear electric generation system to harvest vibration energy from a running vehicle
Linear electric generation system to harvest vibration energy from a running vehicle Open
Methods to harvest energy that is wasted during road vehicle operation have been studied in recent years. Mechanical vibrations from vertical motion induced by road bumps dissipate a large amount of energy. A linear electric generation sys…
View article: Development and Performance Investigation on a 60kW Induction Motor for EV Propulsion
Development and Performance Investigation on a 60kW Induction Motor for EV Propulsion Open
This paper introduces the development process and investigation of a 60kW induction motor for electric vehicles. We present performance improvement in the induction motor of electric vehicle using copper die-casting based on a multi-gate p…
View article: Analysis and Experimental Characterization of Low Speed Direct Drive Fractional Slot Concentrated Winding Surface Permanent Magnet Synchronous Motor with Consequent Pole Rotor
Analysis and Experimental Characterization of Low Speed Direct Drive Fractional Slot Concentrated Winding Surface Permanent Magnet Synchronous Motor with Consequent Pole Rotor Open
This paper describes analysis and experimental characterization of low speed direct drive fractional slot concentrated winding (FSCW) surface permanent magnet synchronous motor (SPMSM) with consequent pole (CP) rotor, for which studies hav…
View article: Thermal Analysis of High Speed Induction Motor by Using Lumped-Circuit Parameters
Thermal Analysis of High Speed Induction Motor by Using Lumped-Circuit Parameters Open
This paper deals with the electromagnetic and thermal analysis of high speed induction motor. The induction motor is analyzed by time-varying magnetic finite element method and its thermal analysis is carried out by using analytical lumped…