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129 巻, 5 号
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Xinhong Hei, Sei Takahashi, Hideo Nakamura2009 年 129 巻 5 号 p. 455-461
発行日: 2009/05/01
公開日: 2009/05/01
ジャーナル フリーComponent-based Distributed Railway Interlocking System (CBDRIS) was presented recently. It is expected to reduce the development time and improve the reliability of railway interlocking systems. All interlocking devices in CBDRIS are at the same layer and there is no centralized interlocking computer. In this paper the CBDRIS is modeled with Petri Nets. We model CBDRIS in three layers: functional modules, device components which consist of functional modules, and the whole interlocking system which comprises of the device components. Considering route conflict and device conflict probabilities are key factors to route reservation success, we analyze the relations between the two conflict probabilities and route reservation success probability with the proposed approach and based on the modeling results, which is useful for system design and development.抄録全体を表示PDF形式でダウンロード (1861K) -
Ghislain Remy, Guillaume Krebs, Abdelmounaïm Tounzi, Pierre-Jean ...2009 年 129 巻 5 号 p. 462-469
発行日: 2009/05/01
公開日: 2009/05/01
ジャーナル フリーThis paper presents a Finite Element Analysis of a Permanent Magnet Linear Synchronous Motor. The aim is to obtain an accurate estimation of the detent force without oversize computation. First, some usual techniques dedicated to the calculation of the forces in electromagnetic devices, such as the Virtual Work Method and the Maxwell Stress Tensor, are described. Some keypoints of the meshing method using a commercial FEM software are presented and used in order to improve the thrust computations. After that, the topology and features of the studied motor are described to highlight specific problems of the modelling process. In the 2D FEM case, new meshing techniques are proposed, according to the force calculations. The FEM results obtained from the different methods are analysed and compared with the experimental ones. Second, using FEM results, a study of the independence of the cogging and the end-effect forces is presented. Particularly, an original approach is suggested in order to compute the cogging force only, using the same mesh for each motion step. Then, the PMLSM geometry is adapted to calculate the end-effect forces only.抄録全体を表示PDF形式でダウンロード (1764K) -
川畑 理, 大沼 均2009 年 129 巻 5 号 p. 470-475
発行日: 2009/05/01
公開日: 2009/05/01
ジャーナル フリーIn this paper, we present a design method for reducing local losses in a Gate Turn-Off Thyristor (GTO) at turn-on and protecting GTOs, particularly those of the flat-package type used in the high-frequency switching from overheating failure. This method utilizes the measurement of cathode-current spread obtained by infrared measurement. The performance of this was verified observing the gate-current at turn-on in a GTO used in the LC resonant commutation circuit for a power supply rated 10kHz, 1.0MW.抄録全体を表示PDF形式でダウンロード (827K) -
小山 貴之, 角川 滋, 川又 昭一, 北村 正司2009 年 129 巻 5 号 p. 476-481
発行日: 2009/05/01
公開日: 2009/05/01
ジャーナル フリーA method for obtaining the optimal design of single-phase permanent magnet (PM) synchronous motors was developed. This method is based on 3D electromagnetic field analysis and electrical circuit analysis. Numerical results show that the torque ripple for the motor shape optimized by using the proposed method is half that for the initial motor shape. Thus the proposed method is extremely effective for reducing the torque ripple in the motor. Further, the optimal design can be obtained within an acceptable CPU time by using this method.抄録全体を表示PDF形式でダウンロード (1691K) -
春名 順之介, 伊東 淳一2009 年 129 巻 5 号 p. 482-489
発行日: 2009/05/01
公開日: 2009/05/01
ジャーナル フリーThis paper describes a strategy for control of the input current of a matrix converter with a generator as the input. The line impedance is larger than the power grid when the generator is used as the input of the matrix converter. The resonance between the synchronous reactance of the generator and the input capacitance results in unstable behavior of the matrix converter. For a stable operation, stability control is provided to the rotating frame on the generator side. With the proposed method, both generator current and output voltage can be controlled, regardless of the generator speed. In addition, optimal input power factor control is proposed for achieving the maximum modulation index of the matrix converter.
This study confirms the validity of the proposed control strategy on the basis of the results of simulations and experiments. Oscillations in the generator terminal voltage and current can be suppressed by using the proposed stability control. Moreover, the proposed control helps achieve stable operations at a motor load of 1.5kW, and the THD of the input current is reduced to 3.7%.抄録全体を表示PDF形式でダウンロード (1188K) -
横山 貴裕, 大石 潔, 芳賀 仁, 柴田 純司2009 年 129 巻 5 号 p. 490-497
発行日: 2009/05/01
公開日: 2009/05/01
ジャーナル フリーIn this paper, we propose a method for the digital control of IPM motors in order to achieve a high power factor in single-phase to three-phase power converters without reactors or electrolytic capacitors. For achieving the unity power factor under any load condition and any speed condition, we propose a new digital control method that involves the use of a new feedback technique and a new feedforward technique on the source-current regulator side. The proposed digital control system is constructed by using DSP devices. In this paper, we also propose a new method for the compensation of one sampling delay time. The superior performance of the proposed method is demonstrated by experimental results. The experimental results were obtained using 1.5[kW] inverter system, which consists of a vector control system with a 14[μF] dc-link capacitor. The maximum power factor obtained in the experiments was 96.8[%].抄録全体を表示PDF形式でダウンロード (1237K) -
伊藤 聡彦, 吉田 俊哉2009 年 129 巻 5 号 p. 498-504
発行日: 2009/05/01
公開日: 2009/05/01
ジャーナル フリーA new method for detecting position of shaft motors is proposed. A Hall sensor array measures the magnetic flux from the shaft surface. Each Hall sensor output is mixed with given coefficients. The mixed signal provides the fundamental component of the flux distribution of the shaft surface; the space harmonics of the distribution are filtered out. This filtered signal is used to obtain position information with good linearity and precision. A harmonic component can also be extracted by modifying the coefficients. This harmonic signal can be used for position detection with good linearity and precision. In our experiments carried out using the proposed shaft drive system with a span of 360mm, the position error is found to be within ±0.03mm.抄録全体を表示PDF形式でダウンロード (1657K) -
Suroso , Toshihiko Noguchi2009 年 129 巻 5 号 p. 505-510
発行日: 2009/05/01
公開日: 2009/05/01
ジャーナル フリーThis paper presents a new configuration of a three-level current-source PWM inverter (CSI) with a full common-source or common-emitter topology in terms of all transistor switching devices. Using this new configuration, the number of gate or base drive power supplies can dramatically be reduced to only a single instead of use of several isolated power supplies or conventional bootstrap circuits. As a result, bulky, heavy and expensive transformers and capacitors in the drive circuits are eliminated. In addition, the proposed configuration is capable to be operated at a higher switching frequency and a higher voltage without violent potential changes because of its common-source or common-emitter topology. Design and operation principle of the new circuit are investigated and analyzed using computer simulations. Finally, effectiveness of the circuit is experimentally verified by using a laboratory prototype set up. The simulation and the experimental results show that the circuit works properly to generate a three-level output current waveform, which proves feasibility of the proposed approach.抄録全体を表示PDF形式でダウンロード (854K) -
入江 寿一, 田原 陽介2009 年 129 巻 5 号 p. 511-518
発行日: 2009/05/01
公開日: 2009/05/01
ジャーナル フリーNon-contact energy transfer systems are used in various fields in industry. A high-frequency constant current must be supplied to the transmission line of this system. Pick-up coils that are magnetically coupled with the transmission line are used to receive the power from the transmission line. The received power is converted into a constant voltage and used as a power source.
When there are two or more pick-up coils on the transmission line, the output of one pick-up coil does not affect the other pick-up coils on the transmission line if the transmission line current is constant. We have proposed that an immittance converter be used to realize a constant current source and a constant voltage source. The input impedance of the immittance converter is proportional to the admittance of the load connected across output terminals of that. In this converter, the output current is proportional to the input voltage, and the output voltage is proportional to the input current. Consequently, it transforms a constant voltage source into a constant current source and a constant current source into a constant voltage source.
In this paper, a cascade configuration of a T-LCL-type immittance converter and a T-CLC-type immittance converter in a non-contact energy transfer system is proposed.抄録全体を表示PDF形式でダウンロード (1257K) -
余 錦華, 石井 将太, 横田 祥, 佐久間 裕司, 大山 恭弘2009 年 129 巻 5 号 p. 519-525
発行日: 2009/05/01
公開日: 2009/05/01
ジャーナル フリーA previously developed electric cart was improved by installing a knob that allows the driver to continuously vary the pedal load between the strenuous and assisted modes. This paper explains how the pedal load is determined and a design method for the cart control system. First, the largest pedal load is determined from the standpoint of ergonomics on the basis of the rating of perceived exertion and the Karvonen formula with a special focus on the motor function of the elderly. Then, a gain-scheduling cart control system for any pedal load in the allowed range is described, and a stability condition is derived using dynamic parallel distributed compensation. Experimental results demonstrate the validity of the cart control system.抄録全体を表示PDF形式でダウンロード (933K) -
松村 一歩, 吉田 俊哉2009 年 129 巻 5 号 p. 526-533
発行日: 2009/05/01
公開日: 2009/05/01
ジャーナル フリーA new improvement technique for position sensing characteristics of self-sensing active magnetic bearings (AMBs) is proposed. In self-sensing AMBs, the electromagnets work not only as actuators for suspending a rotor but also as position sensors. However, the current that controls the suspending force influences the position sensing because of the nonlinear magnetic characteristics of the electromagnet. Conventional methods for compensation of the current interference complicate the AMB systems and adjusting their parameters becomes difficult. The method proposed in this paper uses bias source current measurement and demodulating timing adjustment. This simple method effectively achieves the compensation of the current interference and offer good position sensing characteristics.抄録全体を表示PDF形式でダウンロード (1616K) -
乗松 泰明, 叶田 玲彦2009 年 129 巻 5 号 p. 534-540
発行日: 2009/05/01
公開日: 2009/05/01
ジャーナル フリーA direct methanol fuel cell (DMFC) is especially expected as a new, high density energy source for mobile usage; however the problem is its power density weakness. As a result, the size of a portable electronic equipment using DMFC is far larger than that of the one which uses another battery. Additionally, steady power supply control is difficult, because output power of the DMFC is changed by the environment etc. In this paper we present a method for controlling the output energy increase in a DMFC. Next, we draw a comparison between the experimental results obtained using this method and these obtained using the constant current control method. Finally, we compare the actual measurement values and the theoretical values obtained using our proposed method.抄録全体を表示PDF形式でダウンロード (1192K)
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