IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Volume 130 , Issue 2
Showing 1-29 articles out of 29 articles from the selected issue
Paper
  • Kimihiko Sato, Hiroshi Fujimoto
    2010 Volume 130 Issue 2 Pages 113-118
    Published: February 01, 2010
    Released: February 01, 2010
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    The shunt active filter, which is connected to power systems in parallel with the load, is considered as a current source. However, the shunt active filter is actually realized by current control using the voltage source type inverter. Authors applied multirate perfect tracking control (PTC) to current control for the shunt active filter. Although conventional single-rate deadbeat control could not guarantee zero tracking error for arbitrary reference signals, the proposed multirate control can achieve perfect tracking at every sampling point. In this paper, we propose a novel method to generate repetitive compensation signals. Simulations and experiments are shown to verify the effectiveness of the proposed method.
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  • Yoshiaki Kano, Takashi Kosaka, Nobuyuki Matsui, Toshihito Nakanishi
    2010 Volume 130 Issue 2 Pages 119-128
    Published: February 01, 2010
    Released: February 01, 2010
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    This paper presents the design of the concentrated-winding IPM motor under saliency-based sensorless drive with a high-frequency signal injection. Finite element analysis is used to examine the influence of the IPM rotor geometry on the operating region during the sensorless drive. On the basis of this analysis, a design procedure has been established to obtain a suitable rotor geometry that can maximize the torque capability during the sensorless drive. The 45Nm 5.5kW 6 pole 9 slot IPM motor is optimally designed for general industrial application. The validity of the proposed design is experimentally verified by using the prototype.
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  • Jun-ichi Itoh, Hiroshi Tamura
    2010 Volume 130 Issue 2 Pages 129-137
    Published: February 01, 2010
    Released: February 01, 2010
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    This paper proposes a control strategy for a matrix converter and voltage type inverter in a parallel system that does not require of interconnection reactors. The proposed control strategy is to divide the operation time between a matrix converter and a voltage type inverter. The operation time of each converter is divided in every carrier cycle. As a result, interconnection reactors are not required and the sinusoidal input current waveform of a matrix converter can be obtained. The total output voltage of the proposed system and the output power division ratio for a matrix converter and a voltage type inverter are controlled by the time division ratio of each converter. Furthermore, the voltage error resulting from the operation of time division control was analyzed and compensated.
    The availability of the proposed system and the validity of the proposed control method are confirmed by experimental results.
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  • Yumi Saitoh, Hideaki Itoh, Fuminori Ozaki, Takenobu Nakamura, Shigeyas ...
    2010 Volume 130 Issue 2 Pages 138-143
    Published: February 01, 2010
    Released: February 01, 2010
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    Recently, it has been identified that a KANSEI engineering plays an important role in functional design developing for realizing highly sophisticated products. However, in practical development methods, we design products and optimise the design trial and error, which indecates that we depend on the skill set of experts.
    In this paper, we focus on an automobile electric power steering (EPS) for which a functional design is required. First, the KANSEI structure is determined on the basis of the steering feeling of an experienced driver, and an EPS control design based on this KANSEI structure is proposed. Then, the EPS control parameters are adjusted in accordance with the KANSEI index. Finally, by assessing the experimental results obtained from the driver, the effectiveness of the proposed design method is verified.
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  • Hidefumi Takaya, Kyosuke Miyagi, Kimimori Hamada
    2010 Volume 130 Issue 2 Pages 144-149
    Published: February 01, 2010
    Released: February 01, 2010
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    A MOSFET structure called a FITMOS (Floating Island and Thick Bottom Oxide Trench Gate MOSFET) that exhibits a record low loss in the 60V breakdown voltage (BVdss) range has been successfully developed. The following improvements achieved progress in the characteristic of FITMOS. (1) At the time of AC operation, the charges in the floating P islands that are a feature of the floating type device become greater, thereby increasing the on-resistance (Ron) due to the JFET effect. This issue was solved by forming passive hole gates in the end walls of the trenches. The Ron under AC operation is equivalent to the Ron under DC operation. This paper clarified the influence of the passive hole gate diffusion layer shape and the impurity concentration to BVdss and AC operation. (2) The trade-off of BVdss and Ron has been improved by making the floating island into an elliptical form. A BVdss of 83V and a specific on-resistance (RonA) of 36mΩmm2 were obtained.
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  • Yoshiyuki Ishihara, Shinji Takakura
    2010 Volume 130 Issue 2 Pages 150-157
    Published: February 01, 2010
    Released: February 01, 2010
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    In this paper, we propose a new short span seeking control of hard disk drives (HDDs). The proposed method employs multi-objective feed-forward control that specifies the speed of seeking and the suppression rate of resonance excitation by using Η2/Η norm. In this method, all specifications are included in the multi-objective optimization problem that is defined by using LMIs, and we can obtain the optimal feed-forward input by solving the LMIs. The obtained feed-forward input can achieve faster seeking than conventional methods, and prevents the excitation of the actuator resonance modes that cause vibration of the head position. The effectiveness of the proposed method is verified experimentally by using an actual HDD.
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  • Takumi Ohnuma, Suk-Hwa Jung, Shinji Doki, Shigeru Okuma
    2010 Volume 130 Issue 2 Pages 158-165
    Published: February 01, 2010
    Released: February 01, 2010
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    This paper presents a new maximum torque control with inductance setting in extended EMF observers for sensorless controls. The maximum torque control is defined on maximum torque control f-t axes, whose f-axis is parallel to tangential lines of the constant torque curves in the d-q current axes. The angle between f-t axes and d-q axes is defined as φ. The position estimation error caused by inductance error can be calculated. The inductance is set so as to make the estimated position error equal to φ.
    Since the maximum torque control is realized simply by making the f-axis current component zero, complicated calculation is not required. Moreover, the proposed control is robust against magnetic saturation. The validity of the proposed system is confirmed by experiments.
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  • Takayuki Koyama, Junnosuke Nakatsugawa, Yuji Enomoto
    2010 Volume 130 Issue 2 Pages 166-172
    Published: February 01, 2010
    Released: February 01, 2010
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    A soft magnetic composite (SMC) has some advantages, namely, three-dimensional magnetic isotropy and low eddy current loss. Thus, it can be used to build a new type of motor with a three-dimensional structure, improved space factor of winding improved the power density. A claw teeth motor is one of the motors that have three-dimensional structure, and it is made of an SMC. Due to its structure, the claw teeth motor has an unbalanced three-phase magnetic circuit, which leads to low-order harmonic components in the torque waveform. For reducing the torque ripple, it is important to estimate the magnetic torque and the cogging torque because the total torque is the sum of these torques. In this study a method for decomposing the total torque under the load condition into the magnetic torque and cogging torque is presented. The proposed method can quantitatively estimate low-order harmonic components of the magnetic torque and cogging torque caused by an unbalanced three-phase magnetic circuit for each phase.
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  • Hideaki Fujita, Ryo Suzuki
    2010 Volume 130 Issue 2 Pages 173-180
    Published: February 01, 2010
    Released: February 01, 2010
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    This paper presents the operating performance of a three-phase solar power conditioner using a single-phase pulse-width modulation (PWM) method. The proposed modulation method turns on or off only one of the three phase legs in one PWM-carrier period. The proposed method enables to reduce the average switching frequency by a factor of three, and thus it has a switching power loss four times smaller than a conventional three-phase PWM method does. Experimental results obtained by using a 4-kW, 200-V setup are shown to verify the operating principle and performance. The experimental setup exhibits a high efficiency of 98% and an acceptable total harmonic distortion (THD) as low as 4.1%.
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  • Katsunori Soejima, Tsuyoshi Higuchi, Takashi Abe, Tadashi Hirayama, Ka ...
    2010 Volume 130 Issue 2 Pages 181-188
    Published: February 01, 2010
    Released: February 01, 2010
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    We have developed a low-speed and low-capacity wind power generator. In this paper, we introduce the outline of the 5kW multi-polar synchronous generator that generates the electric power efficiently from 50rpm to 180rpm. The generator is produced by a magnetic powder core for cost reduction. We also express the outline and field test results of the low-capacity power plant constructed in Ohmura City, Nagasaki.
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  • Kansuke Fujii, Takayuki Kikuchi, Kazuyuki Yoda
    2010 Volume 130 Issue 2 Pages 189-194
    Published: February 01, 2010
    Released: February 01, 2010
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    A 2-MVA uninterruptible power supply (UPS) system has been developed for compensating for voltage dips in a medium voltage network. The UPS system realizes a high efficiency (99.7%) during single-pulse switching. In this paper, the UPS configurations, storage devices, and transfer switches are compared. Thereafter, the details of the UPS system, the results of the short-circuit test and the system efficiencies are described.
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  • Alireza Nami, Firuz Zare, Arindam Ghosh
    2010 Volume 130 Issue 2 Pages 195-206
    Published: February 01, 2010
    Released: February 01, 2010
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    There is a trade off between a number of output voltage levels and the reliability and efficiency of a multilevel converter. A new configuration of diode-clamped multilevel inverters with a different combination of DC link capacitors voltage has been proposed in this paper. Two different symmetrical and asymmetrical unequal arrangements for a four-level diode-clamped inverter have been compared, in order to find an optimum arrangement with lower switching losses and optimised output voltage quality. The simulation and hardware results for a four-level inverter show that the asymmetrical configuration can obtain more output voltage levels with the same number of components compared with a conventional four-level inverter and this will lead to the reduction of the harmonic content of the output voltage. A new family of multi-output DC-DC converters with a simple control strategy has been utilised as a front-end converter to supply the DC link capacitor voltages for the optimised configuration.
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  • Hirokazu Seki, Yoshiaki Takahashi
    2010 Volume 130 Issue 2 Pages 207-214
    Published: February 01, 2010
    Released: February 01, 2010
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    This paper describes a novel capacitor regenerative braking control scheme of electric powered wheelchairs for efficient driving on downward slopes. An electric powered wheelchair, which generates 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 energy efficiency has to be further improved because it is driven only by battery energy. This study proposes a capacitor regenerative braking circuit and two types of velocity control schemes with variable duty ratio. The proposed regenerative braking circuit is based on the step-up/down circuit with additional resistance and connects right and left motors in series in order to obtain a larger braking power. Some driving experiments on a practical downward slope show the effectiveness of the proposed control system.
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  • Shinji Shinnaka
    2010 Volume 130 Issue 2 Pages 215-227
    Published: February 01, 2010
    Released: February 01, 2010
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    As a simple vector control method for sensorless drives of permanent-magnet synchronous motors, the so-called “Power-Factor-Based (PFB) Vector Control Method” has been proposed. The conventional PFB method directly estimates the phase of the quasi-optimal stator current through a control of the power factor phase, instead of the estimation of the rotor phase. The stator current is controlled in the current reference frame whose secondary axis phase is the same as the stator current phase. This paper proposes a new PEB method where the stator current is controlled in the voltage reference frame whose secondary axis phase is the same as the voltage phase rather than the current phase. It is shown that the similar quasi-optimal stator current control can be attained through the current control with appropriate current commands taking the power factor phase into account. This paper also shows a practical method for generating the current commands and a practical guideline for the design parameters of the new PFB method.
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  • Yoshihiro Maeda, Makoto Iwasaki
    2010 Volume 130 Issue 2 Pages 228-235
    Published: February 01, 2010
    Released: February 01, 2010
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    This paper presents a rolling friction model-based initial friction compensation (IFC) by a disturbance observer for the fast and precise positioning of ball-screw-driven table systems. The effects of rolling friction in mechanisms should be suppressed in order to the achieve required control performance. In this study, therefore, a rolling friction model is adopted to compensate for the initial friction, so that delay-free friction estimation becomes possible. The proposed initial friction compensation method has been verified experimentally by using a prototype of industrial positioning devices.
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  • Minoru Kondo
    2010 Volume 130 Issue 2 Pages 236-242
    Published: February 01, 2010
    Released: February 01, 2010
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    Two different torque expressions are proposed for salient pole synchronous machines. One is the traditional torque-voltage equation. The other is a torque-current equation and has been recently used for permanent magnet synchronous motors. Both these expressions have two terms. According to a general interpretation, one of the terms represents the magnet torque and the second term represents the reluctance torque. However, the corresponding terms in these two expressions do not give the same value when the expressions are used for an interior permanent-magnet synchronous motor. The aim of this study is to demonstrate this disagreement and identify the reason for the same by using two different equivalent circuits for salient pole synchronous machines.
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  • Atsushi Suzuki, Kouhei Ohnishi
    2010 Volume 130 Issue 2 Pages 243-250
    Published: February 01, 2010
    Released: February 01, 2010
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    The four-channel bilateral system that is a hybrid of position and force in the acceleration dimension based on a disturbance observer can be divided into two modal spaces: common and differential modal spaces. In the four-channel bilateral system, bilateral position control is implemented in the differential modal space, and bilateral force control is implemented in the common modal space, respectively. On the other hand, In the three-channel system, unilateral position control is implemented in the slave side, and bilateral force control is implemented in the common modal space. This paper analyzes the performance of position control and force control in four-channel and three-channel systems under time delay. According to the analysis, this paper proposes a method of velocity difference damping that utilizes the velocity difference between the robot and the robot model. This method improves the performance and stability of bilateral force control in the common modal space without deteriorating the position control. The validity of the proposed control system is confirmed by some experimental results.
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  • Kantaro Yoshimoto, Kouji Takahashi, Keiji Okushima, Kazuhiko Tani
    2010 Volume 130 Issue 2 Pages 251-257
    Published: February 01, 2010
    Released: February 01, 2010
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    A new multiple dc-inputs direct electric-power converter (D-EPC) has been developed. It is placed between multiple dc power sources and an ac motor, thereby eliminating the need for a dc/dc converter that is generally used in conventional converter/inverter systems. D-PEC can improve the efficiency of a motor drive system with a more compact size. Its power distribution control is carried out by allotting voltage ratios to each of the two different dc power sources on a time average basis. A new pulse width modulation (PWM) generation technique to drive the switching devices in D-EPC has also been developed. Tests have verified that the three-phase ac motor can be operated by controlling the power distribution between the two power sources.
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Letter
  • Masayoshi Yamamoto, Hisanori Morii, Shigeyuki Funabiki
    2010 Volume 130 Issue 2 Pages 258-259
    Published: February 01, 2010
    Released: February 01, 2010
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    The novel ARCP scheme soft switching inverter without smoothing capacitor in the input DC voltage side is proposed in this paper. The proposed ARCP soft switching inverter can achieve the zero voltage soft switching transition in the main switch, and the zero current soft switching transition in the additional auxiliary switch, in the same way as the conventional ARCP soft switching inverter. The operation characteristics and performances of proposed ARCP soft switching inverter is evaluated and discussed with experimental results.
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