• 제목/요약/키워드: electrical parameters.

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A Maximum Power Control of IPMSM with Real-time Parameter Identification

  • Jun, Hyunwoo;Ahn, Hanwoong;Lee, Hyungwoo;Go, Sungchul;Lee, Ju
    • Journal of Electrical Engineering and Technology
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    • 제12권1호
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    • pp.110-116
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    • 2017
  • This paper proposed a new real-time parameter tracking algorithm. Unlike the convenience algorithms, the proposed real-time parameter tracking algorithm can estimate parameters through three-phase voltage and electric current without coordination transformation, and does not need information on magnetic flux. Therefore, it can estimate parameters regardless of the change according to operation point and cross-saturation effect. In addition, as the quasi-real-time parameter tracking technique can estimate parameters through the four fundamental arithmetic operations instead of complicated algorithms such as numerical value analysis technique and observer design, it can be applied to low-performance DSP. In this paper, a new real-time parameter tracking algorithm is derived from three phase equation. The validity and usefulness of the proposed inductance estimation technique is verified by simulation and experimental results.

전자기 손실을 고려한 소형 외전형 영구자석 풍력발전기의 성능 평가 (1) - 전자기 전달관계 기법을 이용한 자계특성해석 및 회로정수 도출 - (Performance Evaluation of Small-Scaled Wind Power Generator with Outer Permanent Magnet Rotor considering Electromagnetic Losses (1) - Magnetic Field Analysis and Electrical Parameters Derivation using Electromagnetic Transfer Relations Theorem -)

  • 장석명;고경진;최장영
    • 전기학회논문지
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    • 제59권12호
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    • pp.2179-2189
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    • 2010
  • This paper deals with analytical techniques for performance evaluation of small scaled wind power generator with outer permanent magnet rotor. In part (1), using transfer relations theorem, magnetic field distribution characteristics by PM and armature reaction field are derived. Moreover, electrical parameters such as back-EMF, inductance and resistance are calculated from the obtained field characteristic equations. The proposed analytical techniques are validated by nonlinear finite element method using commercial software 'Maxwell' and performance experiments of the manufactured generator. In part (2), generating characteristics analysis such as constant speed characteristics and constant resistive load characteristics, and performance evaluation according to variation of wind speed will be accomplished using the derived electrical parameters.

스위치드 릴럭턴스 전동기의 토오크 리플 저감을 위한 기하학적인 파라미터와 전기적인 파라미터의 최적화 (Optimum Geometric and Electrical Parameter for Minimization Torque Ripple of Switched Reluctance Motor)

  • 최재학;김솔;이갑재;이주;홍경진;최동훈
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제52권3호
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    • pp.93-100
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    • 2003
  • Switched reluctance motor(SRM) has some advantages such as low cost, high torque density but SRM has essentially high torque ripple due to its salient structure. In order to apply SRM to industrial field, torque ripple has to be reduced. This paper introduces optimal design process of SRM using an optimization algorithm of Progressive Quadratic Response Surface Modeling(PQRSM) and two-dimensional(2D) Finite Element Method(FEM). The electrical and geometrical design parameters have been adopted as 2D design variables. From this work, it can be obtained both the optimal design minimized torque ripple and the optima1 design maximized the average torque, respectively. Finally, this Paper Presents Performance comparison of two optimal designs and consider influence of the selected design variables in torque characteristics.

An Improved Torque Feed-forward Control with Observer-based Inertia Identification in PMSM Drives

  • Zhao, Shouhua;Chen, Yangcheng;Cui, Lin
    • Journal of international Conference on Electrical Machines and Systems
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    • 제2권1호
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    • pp.69-76
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    • 2013
  • This paper is concerned with speed tracking control problem for permanent-magnet synchronous drives (PMSM) in the presence of an variable load torque and unknown model parameters. The disturbance of speed control caused by inaccuracy of model parameters has been investigated. A load torque observer has been proposed to observe the load torque and estimate the disturbance caused by inaccuracy of model parameters. Both inertia and friction coefficient are identified in gradient descent approach. The stability condition of the observer has also been studied. Furthermore an improved feed-forward control has been introduced to reduce the speed track error. The proposed control strategy has been verified by both simulation and experimental results.

Sensitivity Analysis of Geometrical Parameters of a Switched Reluctance Motor with Modified Pole Shapes

  • Balaji, M.;Ramkumar, S.;Kamaraj, V.
    • Journal of Electrical Engineering and Technology
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    • 제9권1호
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    • pp.136-142
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    • 2014
  • A major problem in Switched Reluctance Motor (SRM) is torque ripple, which causes undesirable acoustic noise and vibration. This work focuses on reducing the undesirable torque ripple in SRM by modifying stator and rotor geometry. This paper presents a comparative study on torque ripple minimization in SRM with modified pole shapes such as stator pole taper, stator pole face with non-uniform air gap and pole shoe attached to rotor pole. Further this paper presents a detailed sensitivity analysis of the effect of different geometrical parameters that alter the pole face shapes on the performance of SRM. The analysis is performed using finite-element method considering average torque and torque ripple as performance parameters. Based on the analysis, a design combining stator pole taper with non-uniform air gap is proposed to improve the torque characteristics of SRM. The dynamic characteristics of the proposed design are simulated and the results show satisfactory reduction in torque ripple.

유전-퍼지 제어기를 기반으로한 대수 모델 제어기 (Algebraic Model Based Genetic-Fuzzy Control system)

  • 박근화;남문현;김낙교;오진수
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1998년도 하계학술대회 논문집 B
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    • pp.626-628
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    • 1998
  • In this paper, Algebraic Model was proposed in order to overcome the large number of parameters to be adaptively modified is a drawback of the Genetic-Fuzzy control system. So, this problem has aggregating these parameters into a smaller number of parameters. this would result in an easier tuning procedure and would reduce the time necessary for computing the inputs to the process.

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수분함유량에 따른 토양의 전기적 파라미터의 주파수의존성 (Frequency-dependent electrical parameters of soils as a function of the moisture content)

  • 이복희;김기복
    • 조명전기설비학회논문지
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    • 제28권6호
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    • pp.68-74
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    • 2014
  • The electrical parameters of soils are highly dependent on the various factors such as types of soil, chemical compositions, moisture content, temperature, frequency, and so on. The analysis of soil parameters is of fundamental importance in design of grounding systems. In this paper, we present the experimental results of frequency-dependent impedance, resistivity, permittivity of soils as functions of types of soil and moisture content. The impedance and resistivity of soils are decreased as the moisture content and the frequency increase. In particular, the variation of the soil resistivity with the frequency is pronounced in the conditions of high resistivity and low moisture content. On the contrary, the permittivity of soils are sharply decreased with increasing the frequency below 10kHz and the frequency-dependent permittivity of soils are highly changed in the conditions of high moisture and low resistivity.

유도결합형 제논의 가스압력 및 RF전력에 따른 플라즈마의 전기적 특성 (Electrical Properties of Plasma According to Gas Pressure and RF Power of Xe-Inductively Coupled Plasma)

  • 최용성;이경섭
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2006년도 추계학술대회 논문집 광주전남지부
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    • pp.43-47
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    • 2006
  • In this paper, parameters of electron temperature and density for the mercury-free lighting-source were measured to diagnosis and analyze in Xe based inductively coupled plasma (ICP). As results at several dependences of 20~100mTorr Xenon pressure, the brightness of discharge tube was higher (4,900 $cd/m^2$) than other conditions when Xe pressure was 20mTorr and RF power was 200W. In that case, the electron temperature and density were 3.58eV and $3.56{\times}10^{12}cm^2$, respectively. The key parameters of Xe based ICP depended on Xe pressure more than RF power that could be verified. A high electron temperature and low electron density with a suitable Xe pressure are indispensible parameters for Xe based ICP lighting-source.

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M-DNA 전기 특성의 금속 이온 농도 및 합성 온도 의존성 (Dependence of Electrical Properties of M-DNA on Metal Ion Concentration and Synthetic Temperature)

  • 유환일;김경섭;김남훈;노용한
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2007년도 추계학술대회 논문집
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    • pp.105-106
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    • 2007
  • M-DNAs based on zinc and cobalt ions were formed at the conditions of $26^{\circ}C$, 76% humidity, atmosphere, and pH 8.0. Some process parameters in synthesis of M-DNA such as synthetic temperature, concentration of metal ions, and synthetic time were varied and the electrical properties were investigated by changes of the parameters. The electrical properties of M-DNA showed the dependences on synthetic temperature, concentration of metal ions and synthetic time. The I-V characteristics rapidly increased with each increase of the parameters.

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자화 플라즈마 파라메타 측정에 관한 연구 (A Study on the Measurement of Magneto-Plasma Parameters by Probe Method)

  • 성열문;이창영;손제봉;신중홍;곽영순;박정후
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1993년도 하계학술대회 논문집 B
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    • pp.591-593
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    • 1993
  • Magneto plasma has been widely used for controlled fusion and material processings such as etchings, depositions, and sputterings in the various fields. For controlling and guaranting the equipment, precision plasma parameters must be gained. In this experiment, using single probe and double probes, we investigated the effect of magnetic field on magneto plasma. As a result of this experiment, we found the fact that single probe was largely affected by magnetic field for measuring magneto plasma parameters, while double probe was not.

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