IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 127, Issue 7
Displaying 1-14 of 14 articles from this issue
Paper
  • Ikunori Takata
    2007 Volume 127 Issue 7 Pages 685-692
    Published: July 01, 2007
    Released on J-STAGE: September 01, 2007
    JOURNAL FREE ACCESS
    Analytical models of the pin diode in a small current operation are not known yet. This article presents a simple analytical model of the pin diode operation with its confirmation by a numerical simulation. At the onset, carriers recombinations are not included for the simplicity. The exact JF-VF characteristic (JF ∝exp(VF/kT)) could been induced only accounting the Boltzmann distribution of each carrier across the junctions and the diffusion current of each minority carrier in a p-anode or a n-cathode. On this new model, the modifications of hole-electron densities product (ne nh) across junctions, a rough estimation of the large operational current, its carrier distributions, and an effect of carrier recombination on the carrier distribution are plainly estimated and are also compared with the simulation results.
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  • Zenglu Chen, Toshifumi Ise
    2007 Volume 127 Issue 7 Pages 693-699
    Published: July 01, 2007
    Released on J-STAGE: September 01, 2007
    JOURNAL FREE ACCESS
    A novel main circuit topology of transformer-less series voltage sag compensator is proposed. The sagged voltages are compensated by half bridge inverters, which are directly connected in series with the residual voltages and are charged by the residual line-to-line voltages. The proposed compensator can compensate symmetrical three-phase sags down to 37%, or one or two phase sags down to zero if at least one phase is rated voltage. Besides the excellent compensation property related to the compensating depth, the proposed system only need small capacitance in the inverters because they are continuously charged by the residual voltages during the sags. In fact the capacitors are not energy storers but filters, so there is no limit on their compensating time interval. Theoretical analysis is done and the concerned results are derived. Simulation results on resistance loads demonstrated the compensating performances.
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  • Toshifumi Yamakawa, Shinji Wakao, Keiichiro Kondo, Takashi Yoneyama, S ...
    2007 Volume 127 Issue 7 Pages 700-706
    Published: July 01, 2007
    Released on J-STAGE: September 01, 2007
    JOURNAL FREE ACCESS
    This paper investigates starting procedure of rotation sensorless PMSM at coasting condition for railway vehicle traction. To realize the restarting, the initial rotor position and speed at restart are needed. The existing estimation algorithm of the initial position and speed can't be applied to railway vehicle traction because of the higher speed range and the longer current period. We propose novel estimation method of the initial speed. The estimation method is verified experimentally to ensure that it is feasible enough to be applied to the railway vehicle traction system.
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  • Takahiro Yamada, Keisuke Fujisaki
    2007 Volume 127 Issue 7 Pages 707-714
    Published: July 01, 2007
    Released on J-STAGE: September 01, 2007
    JOURNAL FREE ACCESS
    A linear induction motor to be able to make an induction heating and a tension in thin steel sheet treatment process is researched. The major problems in the application of the linear induction motor are meandering of thin steel plate by the electromagnetic force in the normal direction, the heating characteristic and the evaluation of the thrust force as a tension. As a result of the investigation of the frequency characteristic by means of electromagnetic FEM calculation, it is confirmed that the electromagnetic force in the normal direction which consists of attractive force caused by the magnetization and repulsive force caused by Lorentz force becomes almost zero at the crossover frequency. In this frequency, the temperature of the steel sheet at the front and back face becomes almost same distribution. Since the tension value converted from the thrust force is about 10% of experiment equipment, the linear induction motor is also useful for the auxiliary function of the tension roll.
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  • Tetsuya Fukumoto, Hiroto Hamane, Yoichi Hayashi
    2007 Volume 127 Issue 7 Pages 715-722
    Published: July 01, 2007
    Released on J-STAGE: September 01, 2007
    JOURNAL FREE ACCESS
    Position sensor-less vector control is applied to a compressor drive system using an IPMSM to realize higher efficiency. In this paper, a reduction control of cyclic speed change is proposed to achieve the high performance, such as low vibration and low acoustic noise. Designing a speed estimator using an adaptive observer with a wide frequency band, fundamental frequency component of the cyclic speed change is calculated by a band-pass filter. The proposed compensation method recognizing the fundamental component can reduce the cyclic speed change to acceptable level. Principle of the compensation method is presented as well as experimental results.
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  • Hirokazu Seki, Susumu Tadakuma
    2007 Volume 127 Issue 7 Pages 723-730
    Published: July 01, 2007
    Released on J-STAGE: September 01, 2007
    JOURNAL FREE ACCESS
    This paper describes a novel straight and circular road driving control scheme for electric power assisted wheelchairs. “Electric power assisted wheelchair” which assists the driving force by electric motors is expected to be widely used as a mobility support system for elderly people and disabled people, however, the performance of the straight and circular road driving must be further improved because the two wheels drive independently. This paper proposes a novel driving control scheme based on fuzzy algorithm to realize the stable and reliable driving on straight and circular roads. The suitable assisted torque of the right and left wheels is determined by fuzzy algorithm based on the posture angular velocity of the wheelchair and the human input torque proportion of the right and left wheels. Some experiments on the practical roads show the effectiveness of the proposed control system.
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  • Tadanao Zanma, Tomoya Kawamura, Muneaki Ishida
    2007 Volume 127 Issue 7 Pages 731-738
    Published: July 01, 2007
    Released on J-STAGE: September 01, 2007
    JOURNAL FREE ACCESS
    This paper presents a calculation method of parameters of high frequency equivalent circuits of inverter-driven permanent magnet synchronous motors (PMSM). The high frequency oscillatory current such as leakage current to the motor frame (common-mode current) and high frequency oscillatory line current (normal-mode current), are caused due to switching of inverter transistors. A parameter search method based on the particle swarm optimization algorithm is proposed. Agents in the algorithm are grouped so that convergence performance is improved. Some simulation results illustrate the effectiveness of the proposed algorithm.
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  • Hirofumi Kiyotake, Katsuji Shinohara, Kichiro Yamamoto
    2007 Volume 127 Issue 7 Pages 739-746
    Published: July 01, 2007
    Released on J-STAGE: September 01, 2007
    JOURNAL FREE ACCESS
    Speed sensorless vector controlled induction motor drives are the standard choice in many industrial applications, but this can hardly control torque and rotor speed at low speed. Recently, a method based on the high-frequency signal injection has been studied. This paper presents a method for suppressing the effects of the saturation saliency by using high pass filter, and a new approach to estimate the rotor speed. The effectiveness of these methods are demonstrated through experimental results showing both good suppression of saturation harmonics and good sensorless speed control at low speed.
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  • Kenji Kawai, Tadanao Zanma, Muneaki Ishida
    2007 Volume 127 Issue 7 Pages 747-754
    Published: July 01, 2007
    Released on J-STAGE: September 01, 2007
    JOURNAL FREE ACCESS
    This paper proposes a suppression control method of the motor frame vibration caused by the torque ripple. An earlier method utilizes the on-line feedforward compensation signals by the repetitive control and the Fourier series expansion using a vibration signal obtained by an acceleration sensor attached to the motor frame. The method has some suppression effect. However, the earlier method requires much time for generation of the compensation signal. In this paper, a novel configuration for simultaneous on-line vibration suppression control is proposed in order to shorten the amount of time to suppress oscillating frequency. In the configuration, a Parameter Auto-Tuning (PAT) Algorithm which determines proper repetitive control parameters is also proposed. The effectiveness of the proposed method is illustrated through some experimental results.
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  • Kunihiro Shinya, Koichi Saito
    2007 Volume 127 Issue 7 Pages 755-760
    Published: July 01, 2007
    Released on J-STAGE: September 01, 2007
    JOURNAL FREE ACCESS
    This paper describes the influences of magnetization characteristics of the materials on the iron loss of wound-core type three-phase transformer. In the analysis, magnetization characteristics are approximated by a Fourier-series, and it is assumed that the eddy current factor is proportional to the time-varying magnetic flux. Moreover harmonic balance method where the zero-phase-sequence and third harmonic components of flux density are taken into consider is used. From the results of numerical analysis, it is shown that iron loss decreases as the ratio of eddy currents loss to iron loss of the material becomes minor. The importance of non-linearity of magnetization characteristics of the materials to reduce iron loss of wound-core type three-phase transformer is also shown. The analytical results agree roughly with the experimental result.
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  • Takashi Kano, Hiroki Nakayama, Takahiro Ara, Toshiro Matsumura
    2007 Volume 127 Issue 7 Pages 761-766
    Published: July 01, 2007
    Released on J-STAGE: September 01, 2007
    JOURNAL FREE ACCESS
    The mutual leakage reactance between the d-axis damper and field windings is ignored in the conventional d-axis equivalent circuit. It has been pointed out that the calculated value of the field transient current differs considerably from the measured value when this reactance is not taken into account. A method to determine this reactance has been reported previously, but this method has problems concerning the measurement precision. The authors have previously presented a calculation method of equivalent circuits, adapting a DC decay testing method, using two synchronous machines of the same specifications (one with damper winding, the other without). Yet, this method is not practical because of the use of two machines.
    This paper presents a calculation method of equivalent circuit constants taking into account the mutual leakage reactance to accurately represent the field transient current using a single machine. The proposed method determines equivalent circuit constants by calculating the physically-correct d-axis transient reactance from the operational impedances when the field winding is shorted and when the field winding is shorted with an external resistance. The validity of the proposed method is demonstrated by comparing the measured values with the calculated values of field and armature currents at sudden three-phase short-circuit.
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  • —Impact of Rotor Flux Harmonics to Fundamental Component Estimate—
    Shinji Shinnaka
    2007 Volume 127 Issue 7 Pages 767-776
    Published: July 01, 2007
    Released on J-STAGE: September 01, 2007
    JOURNAL FREE ACCESS
    This paper proposes new generalized D-state-observers as new minimum-order flux state-observers for sensorless drive of permanent-magnet synchronous motors. The proposed generalized D-state-observers, which are established by a new approach using filters in the D-module, contain the conventional D-state-observer as a special case, and the associated observer gain also contains the conventional one for the conventional D-state-observer as a special case. Consequently, The proposed generalized D-state-observers provide designers with higher degree of design flexibility. In addition, for the generalized D-state-observers, this paper presents a new analysis about estimation error of rotor flux fundamental component due to rotor flux harmonics originating from non-sinusoidal magnetization, which has been remaining as an unsolved problem so far. It is analytically shown and verified by numerical experiments that harmonics appear on the flux estimate in a similar manner to the original rotor flux harmonics from viewpoints of rotor phase error.
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