Geochul Jeong

Optimal rotor structure design of claw-pole alternator for performance improving using static 3D FEM coupled-circuit model

This paper presents a study on static 3D finite element method (FEM) coupled-circuit model of a 3Kw claw-pole alternator. To derive the Optimal rotor structure, Magneto static 3D FEM used to define representation of the airgap flux density and phase inductance including magnetic saturation effect and leakage flux. Coupled-circuit model is alternator/rectifier system which based circuit analysis program. The static 3D FEM coupled-circuit model compare with transient simulation result, which proves to be coherent.

Design of high-end SynRM based on 3D printing technology

This paper intends to verify, through actual fabrication and test, that 3D printing technology, which is one of the top 10 most promising future technologies, can be grafted onto motor industry. A complicated rotor geometry of SynRM, a non-rare earth motor, was designed and fabricated, using 3D printing technology. This paper tried to test the validity of its research by FEM analysis and load test in comparison with the existing SynRMs.

A study on correcting the nonlinearity between stack length and back electromotive force in spoke type ferrite magnet motors

The accurate estimation of the performance change according to variations in stack length of motors is important in related industries. A permanent magnet (PM) motor usually represents a characteristic in which its back electromotive force (EMF) constant (

A Study on the Design of a 130kW-class IPMSM for Propulsion of Tram-Train

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A study on traction motor design for a Tram-Train which takes into consideration of a permanent magnet scattering

) is linearly proportional to stack length. It is an enormous advantage in designing and estimating the performance of PM motors. However, the linearity cannot be held in spoke-type ferrite magnet synchronous motors (SFMSM) due to the axial leakage magnetic flux that is irrelevant to the stack length. Thus, it is possible to accurately analyze the performance of SFMSM using a 3-D finite-element analysis (FEA) method but this method is very inefficient. In this paper, a new relationship formula that can consider the nonlinearity between stack length and back EMF constant in SFMSM is proposed. This formula can estimate the back EMF constant in a new stack length based on the results of 2-D-FEA and 3-D-FEA in a specific stack length. Finally, the validity of this formula is verified through analyzing its accuracy and testing it according to changes in motor parameters.

A Study on the Characteristics Analysis According to the Permanent Magnet Segmentation Change to IPMSM for Urban Railway Vehicle

환경 문제와 더불어 도심 안에서의 교통수단뿐만 아니라, 도심과 도심을 연결하는 교통수단으로도 철도시스템이 주목받고 있 다. 특히 일반 도로에서 자동차와 함께 운행 가능하면서 건설비도 상대적으로 적은 트램 규모의 철도차량을 활용한 트램-트레 인 시스템은 향후 도심의 교통 문제를 해결해 줄 유력한 방안 중의 하나이다. 트램-트레인의 개념은 철도 차량이 두 가지 운행 모드 즉, 도심 센터를 운행하는 트램 기능과 기존의 도시 간 지역철도 네트워크를 서비스하는 통근열차로 동시에 운행하는 시 스템이다. 이러한 이중 운행방식 개념은 상당한 운영 탄력성과 철도인프라 시설과 연결지점의 효율적인 사용을 제공한다. Fig. 1은 세계의 대표적인 트램-트레인 차량을 보여준다. Fig. 1(a)는 영국의 셰필드-로더럼 구간을 2017년도부터 운행 예정인 트램트레인 차량으로써, Vossloh에서 제작하였으며, 최고 운영속도는 110km/h이다. Fig. 1(b)는 독일 Karlsruhe 시내와 교외 구간를 운영 중인 트램-트레인 차량으로써, 최고 운영속도는 100km/h이다. 트램-트레인은 도심 안에서뿐만 아니라 도시와 도시간의 연 결 교통수단으로 활용이 가능하므로 차량의 경우 100km/h 이상의 주행이 가능한 준고속열차의 성능을 보유하여야 한다. 따라 서 도심 안에서의 저속운전 및 도시간 이동 시의 고속운전이 모두 가능한 추진시스템의 개발이 필수적으로 요구된다. 기존 철도차량 견인용 전동기는 전력용 반도체 및 제어 기술의 발달에 따라 직류전동기에서 유도전동기로 획기적인 발전을 이루어 기술적 완성단계에 진입하였다. 그러나 최근 높은 에너지 밀도를 가지는 희토류계 영구자석이 개발되면서 기존의 유도 전동기보다 효율과 출력밀도가 향상된 매입형 영구자석 동기전동기(Interior Permanent Magnet Synchronous Motor, 이하 IPMSM)가 상당수 개발되었다. 이러한 IPMSM은 높은 효율과 약자속 제어를 통한 넓은 속도 가변 영역 특성을 갖는다. 이러한 Abstract This study considers the design of a 130kW-class IPMSM for propulsion of a Tram-Train. This Tram-Train has a wide range of speed variation. For this reason, this study suggested IPMSM, which has wide speed variation as a motor for propulsion of the Tram-Train, a basic model suitable for the required traction force was designed. IPMSM has different electromagnetic and structural characteristics depending on the shapes of its rotor. Therefore, the suggested model was additionally designed, and by dividing a permanent magnet was changed so as th have a shape with an added bridge. Finally, by analyzing the load characteristics with finite element analysis of the basic and suggested models and by comparing electromagnetic and structural characteristics, a model has been derived that satisfies IPMSM for the propulsion of the Tram-Train.

Design and analysis of magnetic-geared permanent magnet synchronous motor for driving electric vehicles

This is paper on traction motor design for a Tram-Train which takes into consideration of a permanent magnet scattering. A Tram-Train is a railway vehicle that runs at the maximum speed of 70km/h in downtown area and at the maximum speed of 150km/h in-between cities. For this reason, a Tram-Train has characteristics of a wide variable speed area, requiring a traction motor design that is appropriate for the purpose. Accordingly, in this paper, wide variable speed characteristics through field weakening current control and interior permanent-magnet synchronous motors (IPMSM) that is necessary for high speed are proposed. But since IPMSM is in the shape of a permanent magnet that is inserted within the interior of a rotor, scattering problems that are caused by a strong centrifugal force occur. Therefore, in this paper, a design that is suitable for the requirements of a Tram-Train and that takes the scattering problem into consideration was implemented.

A Study on Analytical Methods of FEM-Based Edge Heating System

The following study carried out the characteristic analysis based on the magnet segment of Interior Permanent Magnet Synchronous Motor(IPMSM) for the urban railway vehicles. IPMSM affects the electromagnetic characteristics through the change in magnetic flux based on the rotor structure, and significantly influences the structural features through the change of pressure. Therefore, satisfied by the demanded traction force of the IPMSM, magnet segment derived three different model types. The 1-segment PM model consisted an undivided permanent magnet. The 2-Bridge model consisted a divided permanent magnet with the application of Bridge. The 3-Bridge model consisted additional dividing with one more Bridge applied. The electromagnetic characteristics of the three models were compared and analyzed along with the structural features regarding the scattering of permanent magnet based on strong centrifugal force from the rotation of the rotor at high speed. In conclusion, the final model with electromagnetic characteristics and structural features most suitable of IPMSM for the urban railway vehicles was derived, and the effectiveness was verified through the characteristic experiments after the production of the derived model.

Design parameter analysis of the linear induction motor for Maglev conveying system

In order to increase the output power density and maintainability of the conventional driving system in electric vehicle, the research on magnetic gears is being carried out variously all over the world. In this paper, the design technique of the magnetic-geared permanent magnet synchronous motor(MG-PMSM) is first studied for the application of the MG-PMSM structurally integrated with magnetic gear and PMSM to the electric vehicle driving system. In addition, a small-scale MG-PMSM model is designed and analyzed using an electromagnetic FEM tool.

A study on the eddy current formation by leakage magnetic flux on the PMSM rotor retaining plate and reduction method

This paper focuses on analytical methods of a finite-element method (FEM)-based edge heating system. The edge heating system plays a role in maintaining the temperature in the hot rolling process of carbon steel. Carbon steel moves along the production line and maintains the temperature by the edge heating system in the process. Power-of-the-edge heating system is transmitted to carbon steel during the process. Eddy currents are generated in carbon steel by Faraday’s law of electromagnetic induction, and eddy current loss serves as a heat source to increase the temperature. Thus, there is a need for accurate electromagnetic-field analysis and thermal analysis because the eddy current path generated in carbon steel greatly affects the heat distribution in carbon steel. This multiphysics analysis requires high reliability. Accordingly, this paper presents a coupling analysis method using an FEM-based coordinate mapping method as a more accurate analytical method. This paper also established an analytical approach to the edge heating system using the ductility analytical method of this coordinate mapping method.