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電氣學會論文誌. The Transactions of the Institute of Elec... 22건

  1. [해외논문]   A Study on the Basic Characteristics of a Novel Design Active Magnetic Bearing with Permanent Magnet Bias Flux  

    Kurita, Nobuyuki (Department of Electronic Engineering, Gunma University ) , Ohshio, Keisuke (Department of Electronic Engineering, Gunma University ) , Ishikawa, Takeo (Department of Electronic Engineering, Gunma University)
    電氣學會論文誌. The Transactions of the Institute of Electrical Engineers of Japan. D, A publication of industry applications society. D, 産業應用 v.131 no.8 ,pp. 1000 - 1006 , 2011 , 0913-6339 ,

    초록

    Advances in the industrial field demand sophisticated electrical motors. However, degradation of traditional ball bearing systems can reduce the efficiency of the motor over time. In addition, bearings require regular maintenance such as lubrication and replacement. Moreover, they cannot be used under some specific environments such as high temperature and vacuum. In order to overcome these problems, this paper proposes a novel active magnetic bearing design. It has only four poles to control the horizontal and vertical suspension, and it is possible to increase the coil winding number without an increase in shaft length. Hence, we can design a high attractive force and stiffness bearing. The stator was initially designed by magnetic field analysis. A simple experimental setup was fabricated in order to confirm the operation principle and attractive force characteristic. The time domain dynamic performance was confirmed by simulation and experimental results. The experimental results verified that the proposed magnetic bearing has sufficient performance for industrial application. Additionally, a small size hydraulic generator was designed for future application.

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  2. [해외논문]   A Hybrid Converter for Improving Light Load Efficiency  

    Takahashi, Masaya (Department of Electrical and Electronic Engineering, Oita University ) , Nishijima, Kimihiro (Department of Electrical and Electronic Engineering, Oita University ) , Nagao, Michihiko (Department of Electrical and Electronic Engineering, Oita University ) , Sato, Terukazu (Department of Electrical and Electronic Engineering, Oita University ) , Nabeshima, Takashi (Department of Electrical and Electronic Engineering, Oita University)
    電氣學會論文誌. The Transactions of the Institute of Electrical Engineers of Japan. D, A publication of industry applications society. D, 産業應用 v.131 no.8 ,pp. 1007 - 1012 , 2011 , 0913-6339 ,

    초록

    In order to reduce power consumption of electronic equipment in stand-by mode, idle-mode and sleep-mode, a simple efficiency improvement technique for switching regulator in light load region is proposed. In this technique, under the light load, the small switching elements in a MOSFET driver circuit are used instead of the switching elements in a main regulator circuit to reduce driving losses. Of course, under the load heavier than light load, the MOSFET driver drives the switching elements in the main regulator circuit. The efficiency of a 2.5V/5A prototype buck converter is improved from 47.1% to 72.7% by using the proposed technique.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  3. [해외논문]   Stability Analysis and Experimental Evaluation of a Control Strategy for Islanded Operation of Distributed Generation Units  

    Bahrani, Behrooz (Industrial Electronics Laboratory, Swiss Federal Institute of Technology ) , Karimi, Houshang (Department of Electrical Engineering, Sharif University of Technology ) , Iravani, Reza (Department of Electrical and Computer Engineering, University of Toronto)
    電氣學會論文誌. The Transactions of the Institute of Electrical Engineers of Japan. D, A publication of industry applications society. D, 産業應用 v.131 no.8 ,pp. 1013 - 1022 , 2011 , 0913-6339 ,

    초록

    This paper presents stability analysis of a distributed generation (DG) controller (1) , in an islanded mode, based on the Mapping Theorem and the Zero Exclusion Condition, and validates the results based on a laboratory scale experimental setup. The DG unit is interfaced to the host system through a voltage-sourced converter (VSC). The control strategy regulates the load voltage at the desired value in the islanded mode, despite uncertainties in the load parameters. The frequency of the island is controlled in an open loop manner by an internal oscillator. The experimental results show that the controller provides robust voltage control for a wide range of load parameters, and even maintains the voltage within the prescribed range during the start-up transients of a motor which is part of the island load.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  4. [해외논문]   Novel Approach in Sensorless Speed Control of Salient Axial-Gap Self-Bearing Motor Using Extended Electromotive Force  

    Nguyen, Quang-Dich (Faculty of Science and Engineering, Ritsumeikan University ) , Ueno, Satoshi (Faculty of Science and Engineering, Ritsumeikan University)
    電氣學會論文誌. The Transactions of the Institute of Electrical Engineers of Japan. D, A publication of industry applications society. D, 産業應用 v.131 no.8 ,pp. 1023 - 1028 , 2011 , 0913-6339 ,

    초록

    Axial-gap self-bearing motor (AGBM) is an electrical combination of an axial flux motor and a thrust magnetic bearing, hence it can support rotation and magnetic levitation without any additional windings. The goal of this paper is utilization of the state observer to research a new capability of sensorless speed control of a salient AGBM. First, analytical and theoretical evaluation for a sensorless speed vector control of a salient AGBM is presented. The approach is based on the estimation of the extended electromotive force (EEMF) through a Luenberger Observer (LO) with help of reference stator voltages, measured stator currents and measured axial displacement. Then, experiment is implemented based on dSpace1104 with two three-phase inverters. The experimental results confirm that the AGBM can simultaneously produce levitation force and rotational torque. Moreover, speed and axial displacement can be independently controlled without speed sensor.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  5. [해외논문]   A Study on Permanent Magnet Synchronous Motor Characteristics with Rotor Eccentricity  

    Takahata, Ryoichi (Hitachi Research Laboratory, Hitachi, Ltd. ) , Wakui, Shinichi (Hitachi Research Laboratory, Hitachi, Ltd. ) , Miyata, Kenji (Hitachi Research Laboratory, Hitachi, Ltd. ) , Noma, Keiji (Hitachi Industrial Equipment Systems Co., Ltd. ) , Senoo, Masaharu (Hitachi Industrial Equipment Systems Co., Ltd.)
    電氣學會論文誌. The Transactions of the Institute of Electrical Engineers of Japan. D, A publication of industry applications society. D, 産業應用 v.131 no.8 ,pp. 1029 - 1035 , 2011 , 0913-6339 ,

    초록

    This paper describes the influence of rotor eccentricity on permanent magnet synchronous motor characteristics by using the finite element method and several experiments. The rotor eccentricity unbalances the magnetic force and thus increases the mechanical loss. Furthermore, a circulating current generated result in an increase of electric power loss in the permanent magnet synchronous motor with three-phase parallel winding of the stator coils. Therefore, we presented that the flux barrier rotor is effective to reduce the harmful effect of the rotor eccentricity.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  6. [해외논문]   Identification Method of Parasitic Inductances in a Power Electronics Circuit Board using TDR  

    Hashino, Satoshi (Tokyo Metropolitan University ) , Shimizu, Toshihisa (Tokyo Metropolitan University)
    電氣學會論文誌. The Transactions of the Institute of Electrical Engineers of Japan. D, A publication of industry applications society. D, 産業應用 v.131 no.8 ,pp. 1036 - 1041 , 2011 , 0913-6339 ,

    초록

    Accurate identification of parasitic parameters on a printed circuit board (PCB) and establishment of an effective design method by considering the parasitic components in a power electronics circuit will become major technological issues to increase the power density of power converters. This study focuses on time domain reflectometry (TDR) method in order to identify and to measure the value of parasitic elements on the PCB in which circuit components are closely mounted. A printed circuit board for high power density converter can be effectively designed by using measured value of parasitic parameters. In this paper, two-step measuring method of measuring multiple parasitic inductances of those existing on a buck chopper PCB is proposed. In this method, a discrimination of the location of parasitic elements is identified on the first step, and the values of each parasitic component are measured on the second step. The accuracy of the measured parasitic inductances is verified through the comparison of experimental and simulation results.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  7. [해외논문]   Multirate Deadbeat Control for 100kHz Single Phase Utility Interactive Inverter with FPGA Based Hardware Controller  

    Yokoyama, Tomoki (Department of Robotics and Mechatronics, Graduate school of Science and Technology for Future Life, Tokyo Denki University ) , Saigusa, Takahiro (Department of Robotics and Mechatronics, Graduate school of Science and Technology for Future Life, Tokyo Denki University)
    電氣學會論文誌. The Transactions of the Institute of Electrical Engineers of Japan. D, A publication of industry applications society. D, 産業應用 v.131 no.8 ,pp. 1042 - 1048 , 2011 , 0913-6339 ,

    초록

    A current control method for the utility interactive inverter based on multi-rate deadbeat control method with FPGA based hardware controller is verified for 100kHz carrier PWM inverter. As the distributed power systems spread, the requirement of the control accuracy for the utility interactive inverter becomes more precise. Deadbeat control is one method to ensure the output voltage or current matches to the references at the sampling instant, so adopting this control law to the utility interactive inverter, the response of the system is much improved with small LC filter component compared with the conventional PI control. A current control method for the utility interactive inverter based on multi-rate deadbeat control, single-rate deadbeat control and PI control were compared. Multi-rate deadbeat control improves the tracking accuracy to the reference compared with the conventional single-rate deadbeat control and PI control. The advantages and disadvantages are discussed through simulations and experiments.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  8. [해외논문]   Design Theory of a Variable Characteristic Motor Using Compound Magnetomotive Forces  

    Kato, Takashi (Nissan Motor Co., Ltd. ) , Akatsu, Kan (Shibaura Institute of Technology ) , Shigeta, Tomoaki (Shibaura Institute of Technology ) , Nakano, Masaki (Nissan Motor Co., Ltd. ) , Tsukamoto, Masahiro (Nissan Motor Co., Ltd. ) , Arimitsu, Minoru (Nissan Motor Co., Ltd.)
    電氣學會論文誌. The Transactions of the Institute of Electrical Engineers of Japan. D, A publication of industry applications society. D, 産業應用 v.131 no.8 ,pp. 1049 - 1058 , 2011 , 0913-6339 ,

    초록

    The permanent magnet synchronous motor offers the possibility of obtaining higher efficiency in a smaller motor size. However, it is difficult to vary the range of high motor efficiency because of its constant magnetomotive force (MMF) level. This paper proposes a variable characteristic motor that embodies a new concept of the compound magnetomotive forces (CMMF) motor. The motor uses a special magnet arrangement that has the MMF of components with different number of pole pairs. The application of compound current control to this motor makes it possible to vary the motor speed and torque (N-T) characteristics. This paper describes the derivation of the theoretical equations for this CMMF motor. It also presents the results of FEA and experiments conducted with the prototype motor to demonstrate the validity of the CMMF concept.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  9. [해외논문]   輸送システムにおける複数流入路での合流に伴う輻輳現象の解析  

    Hoshino, Takahiro , Tsuboi, Kazuhiro , Hamamatsu, Yoshio
    電氣學會論文誌. The Transactions of the Institute of Electrical Engineers of Japan. D, A publication of industry applications society. D, 産業應用 v.131 no.8 ,pp. 1059 - 1067 , 2011 , 0913-6339 ,

    초록

    In a transportation system, a merging control strategy is necessary to avoid collisions between vehicles at a merging section with entry lines. In this study, under the assumption that each entry line is assigned time-independent priority, we analyze traffic congestion with a stochastic model. A quantitative estimation of the congestion is successfully obtained in terms of the average queue length and the average queuing delay. On the basis of analytical results, we propose a control strategy that changes the priority periodically. Using simulation, it is clarified that the proposed control strategy gives an arbitrary values of the queue length and the queuing delay on each line.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  10. [해외논문]   誘起電圧歪みに起因した6次トルクリプルの準完全補償可能なPMSMのための簡易トルクセンサレストルク制御  

    Shinnaka, Shinji , Kishida, Hideo
    電氣學會論文誌. The Transactions of the Institute of Electrical Engineers of Japan. D, A publication of industry applications society. D, 産業應用 v.131 no.8 ,pp. 1068 - 1077 , 2011 , 0913-6339 ,

    초록

    This paper proposes a new torque-sensorless torque control method for permanent-magnet synchronous motors (PMSMs). The proposed method can almost perfectly compensate the 6th harmonic torque ripple that is caused by the nonsinusoidal distributions of the back EMF and rotor magnetic flux of PMSMs. The torque control system is, in principle, constructed on the basis of the vector control, but has two new dedicated speed-varying devices—a harmonic torque observer and current controller. The speed-varying harmonic torque observer can estimate the harmonic component over a wide speed range, even in the case where the produced torque is constant, and generate a suitable compensating signal. The speed-varying current controller shows stable control performance over a wide speed range, it can fully track the compensated current command containing the dc and 6th harmonic components. The effectiveness of the proposed method is examined and verified through extensive numerical experiments.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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