Showing papers by "Jin Hur published in 2010"
09 May 2010
TL;DR: In this article, the authors present a model of core loss resistance for d-q equivalent circuit analysis of IPMSM considering harmonic linkage flux, where the core losses due to harmonic components are considered by increased voltage drop across core loss resistances.
Abstract: This paper presents modeling of core loss resistance for d-q equivalent circuit analysis of IPMSM considering harmonic linkage flux. High efficiency is one of the major advantages of IPMSM, therefore precise loss analysis is required for high efficiency design. However, there is practical limitation of d-q equivalent circuit analysis in the calculation of core loss due to harmonic components of flux especially in high speed region where field weakening is generally applied. Harmonic components of linkage flux leads to the underestimation of core loss. Especially operation with high constant speed power range results in severe underestimate of core loss. Harmonic components of linkage flux are added to the general d-q axis equivalent circuits in this paper, therefore core losses due to harmonic components are considered by increased voltage drop across core loss resistance. From the presented modeling of core loss resistance, precise core loss can be obtained. Verification with FEA and experiments are presented.
63 citations
TL;DR: In this paper, the rotor shape optimization of an interior type permanent magnet (IPM) motor for a reduction of vibration and Electromagnetic Interference (EMI) is presented, where the optimal notches are put on the rotor pole with an arc shape proposed.
Abstract: This paper presents the rotor shape optimization of an interior type permanent magnet (IPM) motor for a reduction of vibration and Electromagnetic Interference (EMI). The vibration and EMI in permanent magnet motors is generated by cogging torque ripple, radial force and commutation torque ripple. Consequently, in order to improve vibration and EMI, the optimal notches are put on the rotor pole with an arc shape proposed. The variation of vibration frequency due to the cogging torque and radial force of each model is computed by the finite element method (FEM). From the analysis result and experiment, we confirmed the proposed model has remarkably improved the vibration and EMI.
32 citations
01 Nov 2010
TL;DR: In this article, the harmonics elimination method by distribution alternation of radial flux density was proposed for the vibration and noise minimization of a interior type permanent magnet (IPM) motor.
Abstract: This paper proposes the harmonics elimination method by distribution alternation of radial flux density for the vibration and noise minimization of a interior type permanent magnet (IPM) motor. For minimization of vibration and noise, the optimal notches due to the shape of magnetic field are designed on the rotor pole face. The variations of vibration computation by finite element method (FEM) and the validity of the analysis and rotor shape design are confirmed by vibration and performance experiments.
31 citations
01 Nov 2010
TL;DR: In this article, the optimal PM shape is designed and the effect of the circulating current in shorted turns on the demagnetization of PM and motor performance is analyzed for IPM type BLDC under continuously controlled 3-phase input current.
Abstract: A stator turn fault in a symmetrical three-phase machine cause a large circulating current to flow and subsequently generated excessive heat in shorted turns, generate irregular control current of the three phase leads to demagnetization. The demagnetization of PM occurred distortion of air-gap magnetic flux distribution caused deterioration of their torque, mechanical vibration etc. In this paper, for minimization of mechanical vibration, the optimal PM shape is designed and the effect of the circulating current in shorted turns on the demagnetization of PM and motor performance is analyzed. For this analysis, this paper developed a FE-based simulation model with a stator turn fault modeling. The demagnetization phenomenon in IPM type BLDC is analyzed under continuously controlled 3-phase input current considering the circulating current in shorted turn using the developed transient analysis method.
11 citations
TL;DR: In this paper, the development of the electric motor-driven pump unit for the electro-hydraulic power steering (EHPS) system using a 42V power-net is presented.
Abstract: Motorization in vehicles is expanding rapidly for fuel efficiency, customer comfort, convenience, and safety features. These new electric loads represent an increase in the required electric power. This has generated interest in new, higher power systems such as the 42V Power Net. The electro-hydraulic power steering (EHPS) system is one of these systems. This paper presents the development of the electric motor-driven pump unit for the EHPS system using a 42V power-Net. The interior type permanent magnet synchronous motor (IPMSM) can be applied to this system with more power density per volume for compactness of the EHPS. In order to improve the system, the IPMSM and its control method was optimized for improved torque characteristics and electric power consumption. The performances of both the pump unit and the IPMSM have been verified by experimental results. Finally, all in one type the electric motor-driven pump unit are developed from the experiment verification.
9 citations
09 May 2010
TL;DR: A finite element method (FEM)-based model of an interior permanent magnet (IPM) motor having inter-turn faults and the circulating current effect causing motor parameter asymmetrical was analyzed.
Abstract: This paper proposes a finite element method (FEM)-based model of an interior permanent magnet (IPM) motor having inter-turn faults. For more realistic simulation studies, the magnetic non-linearity is also considered and the circulating current effect causing motor parameter asymmetrical was analyzed. Also, it is analyzed in point of distortion of air-gap magnetic flux distribution caused deterioration of their torque.
3 citations
TL;DR: Wokim et al. as mentioned in this paper designed an optimal structure of slot antenna array antenna with inner waveguide in accordance with the slot model, and fabrication of its prototype sample operating at the frequency of 24 GHz.
Abstract: - This paper is about design of optimal structure of slot antenna array antenna with inner waveguide in accordance with the slot model, and fabrication of its prototype sample operating at the frequency of 24 GHz. Results of this work can be employed as a useful tool to develop and diversify slot antenna having superior performance and omni-directivity to that of current antenna. The implemented antenna demonstrates ultra-wideband performance for frequency ranges 24 GHz with the relatively high and flat antenna gain of 18.64dBi and low sidelobe levels. In addition, a 2×8 antenna array for phased-array systems and mm-wave sensor applications is also presented.Key Words : Slot Antenna, Millimeter-Wave, Waveguide, Automotive Radar System, Transverse†교신저자, 정회원 : 울산대학교 전기전자정보시스템공학부부교수E-mail : bywokim@ulsan.ac.kr*정 회 원 : 울산대학교 전기전자정보시스템공학부 조교수접수일자 : 2010년 8월 6일최종완료 : 2010년 10월 23일 1. 서 론 전파 전송을 담당하는 안테나는 일반 이동통신을 비롯하여 자동차, 항공, 국방에 걸쳐서 모든 산업에 활용되고 있다. 자동차인 경우에도 타이어 공기압 검지 장치(TPMS), 스마트키 시스템을 비롯하여 차간거리 경보 및 제어 장치에 까지 다양하게 적용되고 있다. 자동차 차간거리 경보 및 제어 시스템에 적용되고 있는 밀리파 레이더의 안테나 방식은 일반적으로 도파관 캐비티 슬롯 안테나를 사용하고 있다. 슬롯 안테나는 급전부와 방사체의 모양과 종류에 따라 구분이 된다. 급전부를 마이크로 스트립 라인으로 사용하는 것은 마이크로 스트립 슬롯 안테나(MAS : Microstrip slot antenna)라고 부르고 급전부를 도파관으로 사용하는 것은 도파관 슬롯 안테나(WSA : Waveguide slot antenna)라고 부른다. 직렬슬롯(Transverse slot)은 1946년 Waston이 등가 전송선에서 직렬성분관련 성분으로서 도파관 슬롯을 처음 논의했다. 슬롯의 임피던스에 관한 근사 표현은 Stevenson과 Oliner에 의해 유도 되었다.[1] 기존 연구에서는 전형적인 전계 분포를 가정하는 슬롯 길이의 함수로써 슬롯 임피던스에 대한 표현을 했다.[2] 또한, 사각 도파관에서의 직렬슬롯(Transverse slot)의 임피던스를 계산하는 방법과 펄스 확장 모멘트 방법에서 수렴(Convergence)을 얻기 위해 슬롯 사이드에 따른 등가 에너지 전류를 소개했다.[3] 그리고 펄스 확장과 포인트 매칭을 가진 모멘트 방법을 사용하여 벽면 두께 제로에 대한 직렬 슬롯 임피던스를 계산했다. 직렬 슬롯에서 배열 안테나로까지의 정확한 해석은 Josefsson에 의해 이루어졌다.[4], [5] 그러나 기존 연구에서는 주로 직열 슬롯 방식을 중심으로 연구가 진행되었으나 최근 강화되고 있는 자동차 업계의 기술요구를 충분히 반영하고 있지 못하고 있다. 이에 본 연구에서는 병렬 슬럿 방식의 안테나 설계 및 최적화 방안에 대한 연구를 실시하고자 한다.
09 May 2010
TL;DR: In this article, the negative 3rd harmonic elimination by air-gap flux density shape dispersion of interior type permanent magnet (IPM) motor for vibration minimization is proposed, the optimal notches are put on the rotor pole face is applied.
Abstract: This paper is proposed the negative 3rd harmonic elimination by air-gap flux density shape dispersion of interior type permanent magnet (IPM) motor for vibration minimization. For minimization of vibration, the optimal notches are put on the rotor pole face is applied. The variations of vibration computation by finite element method (FEM) and the validity of the analysis and rotor shape design are confirmed by vibration experiments.
Proceedings Article•
10 Dec 2010
TL;DR: In this article, the authors presented development in IPM type wind generator and analyzed variation of coil inductance and cogging torque by change of design parameter and showed optimization model about development of output power.
Abstract: The current confluence of energy needs, enhanced environmental awareness and technical developments has led vigorous global efforts toward making wind power a key component of renewable and sustainable energy resources. This paper presents development in IPM type wind generator. Characteristic of generator is changed by various factors. Especially, characteristic of output power is considered significantly. This paper analyzes variation of coil inductance and cogging torque by change of design parameter. And, this paper shows optimization model about development of output power.
TL;DR: In this article, a model based fault detection algorithm for an Advanced ESC System consisting of Hydraulic Control Unit (HCU) with built-in wheel pressure sensors is presented, which can be used for various value-added functions such as Stop & Go Function and Regenerative Brake Function.
Abstract: This paper describes a model based fault detection algorithm for an Advanced ESC System which consists of Hydraulic Control Unit (HCU) with built-in wheel pressure sensors. Advanced ESC System can be used for various value-added functions such as Stop & Go Function and Regenerative Brake Function. Therefore, HCU must have a reliable fault detection. Due to the huge amount of sensor signals, existing specific sensor based fault detection of HCU cannot guarantee the safety of vehicle. However, proposed algorithm dose not require the sensors. When model based fault detection algorithm detects severe failures of the HCU, it warns the driver in advance to prevent accidents due to the failures. For this purpose, a mathematical model is developed and validated in comparison to actual data. Simulation results and data acquired from an actual system are compared with each other to obtain the information needed for the fault detection process.