IEEJ Journal of Industry Applications
Online ISSN : 2187-1108
Print ISSN : 2187-1094
3 巻 , 6 号
選択された号の論文の9件中1~9を表示しています
Special Issue on “Technologies of Rotating Machinery”
Special Issue Paper
Paper
  • Hidenori Tanaka, Takaaki Wakimoto, Toshihiko Tanaka, Masayuki Okamoto, ...
    2014 年 3 巻 6 号 p. 437-445
    発行日: 2014年
    公開日: 2014/11/01
    ジャーナル フリー
    This paper proposes a new control algorithm to reduce the capacity of the previously proposed smart charger for electric vehicles (EVs) on single-phase three-wire distribution feeders using reactive power control on the source side. The basic principle of the proposed reactive power control algorithm is discussed in detail. It is shown that controlling the reactive power on the source side reduces the capacity of the previously proposed smart charger. A digital computer simulation is carried out to confirm the validity of the proposed control algorithm using PSIM software. A prototype experimental model is constructed and tested. The experimental results demonstrate that balanced source currents with a power factor of 0.9, which conforms to Japanese regulations, are obtained on the secondary side of the pole-mounted distribution transformer during both the battery charging and discharging operations in EVs reducing the capacity of the smart charger by 31% in comparison to that of the smart charger with the previously proposed control algorithm.
  • Asmarashid Bin Ponniran, Koichi Matsuura, Koji Orikawa, Jun-ichi Itoh
    2014 年 3 巻 6 号 p. 446-454
    発行日: 2014年
    公開日: 2014/11/01
    ジャーナル フリー
    The purpose of the present paper is to analyze the input inductor design and to establish the relationship between the capacitance of the flying capacitor and the output voltage ripple in order to reduce the size and weight of the flying capacitor DC-DC boost converter (FCBC). The inductance of the input inductor is designed by considering the maximum input current ripple, and the experimental results are used to confirm that the input current ripple is within the designed value. Furthermore, according to the design specifications, the required inductance of an input inductor is approximately 25% of that of a conventional two-level DC-DC boost converter, and the required inductor core volume is approximately 35% of that of a conventional two-level DC-DC boost converter. Moreover, the capacitance of the flying capacitor and the output voltage ripple are confirmed to be independent of each other. Theoretically, this is because the time constant of the output capacitance and the output resistance of the FCBC is larger than the switching period of the switching frequency. This finding is confirmed by the simulation and experimental results of the present study. On the basis of this finding, the capacitance of the flying capacitor can be estimated and designed without considering the output voltage ripple. Moreover, the achieved maximum efficiency of the designed FCBC is 98.5% of the output power at 1kW.
  • Koichi Sakata, Hiroyoshi Asaumi, Kazuyuki Hirachi, Kazuaki Saiki, Hiro ...
    2014 年 3 巻 6 号 p. 455-462
    発行日: 2014年
    公開日: 2014/11/01
    ジャーナル フリー
    High-precision stages are industrial equipment used in micro-fabrications. Fast and precise positioning control is a very important technology for improving the throughput and the product quality. In particular, a large-scale stage has a low resonance mode which disturbs fast and precise positioning because of the structures of the stage. In this paper, a novel feedback system is proposed in a SIMO system using multiple position sensors which are located at an actuator side and a load side. The proposed feedback system has two remarkable features. One is that the effect of the vibration suppression and the phase stabilization of the resonance mode can be tuned simultaneously with only two parameters. The other is that the tuning of the resonance mode does not affect the rigid mode at all. Finally, simulations and experiments with an XY-gantry-stage are performed to demonstrate the advantages of the proposed feedback control system.
  • Yuichi Yokoi, Tsuyoshi Higuchi
    2014 年 3 巻 6 号 p. 463-469
    発行日: 2014年
    公開日: 2014/11/01
    ジャーナル フリー
    This paper proposes a design method for stepped skewing of rotor magnets to selectively eliminate the harmonics of the no-load electromotive force (EMF) and the ripple torque, which is generated by the interaction of the stator current magnetomotive force with the rotor magnet flux distribution. The method is based on the theory that a harmonic component of the ripple torque is generated by the corresponding two harmonics of the no-load EMF. An elementary unit of the proposed skewing for canceling out one harmonic EMF consists of two identical magnet blocks skewed axially. For suppressing a harmonic ripple torque, the corresponding two harmonic EMFs are canceled out by skewing two identical elementary units or a four-step skewing. In the paper, the skew angle for canceling out each harmonic EMF is theoretically obtained. It is shown that one harmonic ripple torque is almost completely suppressed by the proposed four-step skewing through two-dimensional and three-dimensional finite element method (FEM) analyses. In addition, experiments are performed to confirm the selective elimination of one harmonic EMF and to validate the FEM analyses. By using the proposed method, a multiple-step skewing can be designed to simultaneously suppress more than one harmonic component of the ripple torque.
 
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