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Chang J.,Dong - A University | Kim J.,Electrical Motor Research Center | Kang D.,Electrical Motor Research Center | Bang D.,Technical University of Delft
Journal of Magnetics | Year: 2010

This paper describes the development of a novel transverse flux linear motor (TFLM) excited by permanent magnets (PMs). It combines the advantage of two different TFLMs and produces high thrust with reduced normal force. The magnetic field is analyzed by combining the three-dimensional (3D) equivalent magnetic circuit network (EMCN) method with 2D finite element analysis. The experimental findings of the prototype motors are in good agreements with the analysis results, and demonstrate the potential of the proposed motor as a direct drive requiring relatively long displacement of a mover. © 2010 Journal of Magnetics.


Lee J.-Y.,Electrical Motor Research Center | Hong D.-K.,Electrical Motor Research Center | Park D.-H.,Doosan Group | Nam B.-U.,5th R and D Institute | And 2 more authors.
2012 6th International Conference on Electromagnetic Field Problems and Applications, ICEF'2012 | Year: 2012

In this paper, formulas to calculate possible UMFs during assembly process are introduced in order to save calculation time and efforts without using a fully configured 3-dimensional (3-D) analysis model. To calculate the UMFs according to the degree of rotor eccentricity in every time that the rotor position is relatively changed to the stator position in axial direction, the proposed formulas are used with a fully configured 2-dimensional (2-D) model or 2-D and 3-D periodic analysis models. The reliance of the formulas is verified by comparing the results calculated by the formulas and showing the agreement. Then, assembly jigs are designed considering the calculated UMFs. © 2012 IEEE.


Chung S.-U.,Electrical Motor Research Center | Chung S.-U.,Pusan National University | Lee H.-J.,CRINO Co. | Woo B.-C.,Electrical Motor Research Center | And 4 more authors.
IEEE Transactions on Magnetics | Year: 2010

Permanent magnet linear synchronous motors (PMLSMs) have been successfully adopted in a wide variety of industry applications due to improved servo-capability and outstanding dynamic characteristics. However, the conventional PMLSMs need a large amount of permanent magnet (PM) material in the stator resulting in significant cost rise. This paper proposes and analyzes a new doubly salient PM linear synchronous machine (DSPMLSM). The proposed configuration consists of consequent pole stator to reduce PM material and modular mover structure to reduce force ripples. Four different models are chosen and compared by two-dimensional finite element analysis (FEA). The analysis reveals that the proposed DSPMLSM uses only a half amount of PMs, while retaining almost the same characteristics as the conventional PMLSMs. © 2006 IEEE.


Bang D.,Electrical Motor Research Center | Jang G.W.,Sejong University | Hwang S.H.,Kyungnam University | Han P.W.,Electrical Motor Research Center | And 4 more authors.
European Wind Energy Association Conference and Exhibition 2014, EWEA 2014 | Year: 2014

The aim of this paper is to verify a new concept of bearingless machine with a buoyant rotor. Large direct- drive wind generators have disadvantages of large mass and high cost compared to geared generators. In wind turbines, bearing failures have been a continuing problem and a significant proportion of all failures. It is thus required to significantly reduce both the mass and bearing failures of large direct-drive wind generators. In this paper, a new bearingless permanent magnet machine with a buoyant rotor is discussed as a solution to fulfill the requirements for large direct-drive wind generators. The proposed machine concept is verified by the experimental setups built to realize two new concepts: a buoyant rotor concept guided by magnetic bearings and a new bearingless machine concept. The electromagnetic and structural parts of the proposed generator for 10 MW wind turbines are designed by the three-dimensional finite element analysis (3D FEA). In order to identify the mass competitiveness, the total mass of the proposed generator is compared with the mass of a geared generator and a high temperature superconducting generator (HTSG). The total mass of the proposed generator for 10 MW wind turbines is estimated at about 235 tonnes, which is 75 tonnes and 5 tonnes heavier than a geared generator and a HTSG at the same torque rating, respectively.


Kim J.,Electrical Motor Research Center | Lee J.,Electrical Motor Research Center | Kang D.,Electrical Motor Research Center | Kim K.,Korean University of Science and Technology | Chang J.,Dong - A University
Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation, CEFC 2010 | Year: 2010

This paper presents linear position detection method using simple magnetic sensors and its arrangements at a mover. The sensor structure and best mounting position are determined by finite element analysis and the performance of it is evaluated by considering total harmonic distortion of generated waves. The experimental results prove the validity of the developed sensor system and show possibility of it for linear position detection to some low-cost linear servo system © 2010 IEEE.


Chang J.,Dong - A University | Kim J.,Electrical Motor Research Center | Lee J.,Electrical Motor Research Center | Kang D.,Electrical Motor Research Center | Kim K.,Korean University of Science and Technology
Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation, CEFC 2010 | Year: 2010

This paper presents analytical design procedures of transverse flux linear motor (TFLM). With ratios of important design variables and simplified equivalent magnetic circuit, flux linkage is determined at load and no-load condition. The number of turns of windings can be calculated by considering the amplitude of applied voltage, and rated current, coil diameter, and winding area can be obtained with the help of empirical formula for determining required magnetomotive force (MMF). The usefulness of proposed design method for TFLM is verified by three-dimensional finite element analysis and experimental results of prototyped machine. © 2010 IEEE.


Lee J.,Electrical Motor Research Center | Kim J.,Electrical Motor Research Center | Luu P.T.,Energy and Power Conversion Engineering | Hwang S.,Hanyang University | Hong J.,Hanyang University
2016 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2016 | Year: 2016

This paper presents the design and performance analysis of a wound-field synchronous machine as an in-axis motor for electric vehicle traction system. The design target is that maximum output power is 60kW and the power density is more than 0.95 kW/kg. To improve power density without permanent magnet, the gear was used. Furthermore, to keep the inside of the vehicle structure, two motor was used for one traction system. Therefore 30kW-grade motor was designed. In the initial design process, equivalent magnetic circuit method was used. For the detail design to reduce torque ripple, response surface methodology was used. © 2016 IEEE.


Chang J.,Dong - A University | Kim J.,Electrical Motor Research Center | Kang D.,Electrical Motor Research Center
Journal of Magnetics | Year: 2011

This paper presents design procedures of a transverse flux linear motor (TFLM). The minimum and maximum flux linkage was determined by the simplified equivalent magnetic circuit and estimated average magnetic flux density at the air gap region by considering the shape of applied magnetomotive force (MMF). With this information, the number of turns of each phase winding was calculated based on the amplitude of applied voltage and speed of a mover. The rated current, coil diameter, and winding area were obtained with the aid of an empirical formula for determining the required MMF. The usefulness of the proposed design method for TFLM is verified by the three-dimensional equivalent magnetic circuit network (EMCN) method and the experimental results of prototyped machine. © 2011 Journal of Magnetics.

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