IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
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Volume 126, Issue 2
Displaying 1-21 of 21 articles from this issue
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Paper
  • A Passive EMI Filter with Access to the Ungrounded Motor Neutral Line
    —Its Effect on Attenuating Bearing Current—
    Shunsuke Tamura, Hirofumi Akagi
    2006 Volume 126 Issue 2 Pages 95-102
    Published: 2006
    Released on J-STAGE: May 01, 2006
    DOIhttps://doi.org/10.1541/ieejias.126.95
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    This paper describes an effect of a passive EMI filter on preventing bearing current from flowing inside an inverter-driven motor. Motor-bearing damages are often caused by bearing currents resulting from breakdown of grease films in the motor bearing. The high-frequency common-mode voltage generated by the PWM inverter induces a shaft voltage between the rotor and the frame. When the shaft voltage exceeds a breakdown voltage of the grease films, a destructive instantaneous discharge current with a peak value of about 1A flows through the motor bearing. The passive EMI filter, that is unique in access to the motor neutral line, can reduce the shaft voltage as a result of eliminating the high-frequency common-mode voltage from the motor terminals. Hence, no breakdown occurs in the grease film, so that no bearing current flows. The viability and effectiveness of the passive EMI filter is verified by experimental results obtained from a 400-V, 3.7-kW laboratory system.
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  • Minimization of Smoothing Capacitor and Operation Characteristics under Unbalanced Power Source of Direct-Power-Controlled PWM Rectifier
    Toshihiko Noguchi, Akira Sato, Daisuke Takeuchi
    2006 Volume 126 Issue 2 Pages 103-108
    Published: 2006
    Released on J-STAGE: May 01, 2006
    DOIhttps://doi.org/10.1541/ieejias.126.103
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    This paper describes direct power control of a PWM rectifier. The key of this strategy is a direct selection of switching modes on the basis of instantaneous errors of active and reactive power. In addition, this paper presents a theoretical analysis on relation between the instantaneous power and the switching modes, which is essential to compose a switching-mode table. The feature of this method is high-speed response owing to direct-instantaneous-power control with relay elements; hence a DC-bus smoothing capacitor can be minimized. Controllability of the proposed technique was examined through various experimental tests, and it was confirmed that the maximum total input power factor and efficiency were 99.6% and 96.6% over a load power range from 400 to 1600W, respectively. Moreover this paper discusses operation characteristics of the direct-power-controlled PWM rectifier, compared with a conventional subharmonic PWM rectifier, under unbalanced power source condition. Experimental data prove that the proposed technique achieves more than 95-% power factor and less than 6-% DC bus ripples.
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  • Undulating Wear Mechanism of Overhead Rigid Conductor Line
    Mitsuo Aboshi, Hiroshi Nakaya, Hiroyuki Shoji
    2006 Volume 126 Issue 2 Pages 109-115
    Published: 2006
    Released on J-STAGE: May 01, 2006
    DOIhttps://doi.org/10.1541/ieejias.126.109
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    Undulating wear of overhead rigid conductor line causes serious trouble, such as extreme wear of contact lines and contact strips of pantograph. This paper describes the mechanism of the undulating wear based on the results of unevenness measurement of real lines and excitation tests of pantograph. It is confirmed that small unevenness is initially formed by contact force fluctuation of pantograph; its amplitude increases only if its wavelength is equal to one of the wavelengths that can cause undulating wear, and finally the unevenness grows rapidly by contact loss arcs.
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  • Improvements of Power Factor and Torque of a Synchronous Reluctance Motor with a Slit Rotor
    Masayuki Nashiki, Yoshimitu Inoue, Youichi Kawai, Takanori Yokochi, Ak ...
    2006 Volume 126 Issue 2 Pages 116-123
    Published: 2006
    Released on J-STAGE: May 01, 2006
    DOIhttps://doi.org/10.1541/ieejias.126.116
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    Power factor and torque of synchronous reluctance motors with a slit rotor are studied. In there stators, divided teeth made of powder magnetic core are adopted and windings are improved to get high space factor of stator windings and to shorten coil ends. In there rotors, stainless sheets are inserted among soft magnetic metal sheets with adhesive to strengthen the rotors and rotor structure is improved to enlarge the saliency ratio (Ld/Lq). As the result, the power factor 0.78 and 1.6 times torque at same motor size are attained.
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  • Starting Performance Analysis for Universal Motors by FEM
    Kazumi Kurihara, Shin-ichi Sakamoto
    2006 Volume 126 Issue 2 Pages 124-130
    Published: 2006
    Released on J-STAGE: May 01, 2006
    DOIhttps://doi.org/10.1541/ieejias.126.124
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    This paper presents a novel transient analysis of the universal motors taking into account the time-varying brush-contact resistance and mechanical loss. The transient current, torque and speed during the starting process are computed by solving the electromagnetic, circuit and dynamic motion equations, simultaneously. The computed performances have been validated by tests in a 500-W, 2-pole, 50Hz, 100V universal motor.
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  • Performance Analysis of MHz Band Transformer Taking Account of Displacement Current
    Yoshio Mitsutake, Katsuhiro Hirata, Kota Niwa, Yoshiyuki Ishihara
    2006 Volume 126 Issue 2 Pages 131-136
    Published: 2006
    Released on J-STAGE: May 01, 2006
    DOIhttps://doi.org/10.1541/ieejias.126.131
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    In designing power electronics devices, it is very important to grasp the accurate waveforms of input/output voltage and current in order to estimate the efficiency and the power factor. Therefore, it is useful to study the effective dynamic analysis method through a numerical approach. In these computations, the displacement current is ignored because the frequency range is lower than MHz, then the necessity of taking account of displacement current is thought to be uncertain when the transformer is operated at the frequency of more than MHz.
    This paper describes the effect of the displacement current on dynamic performances of MHz band transformer. It is found that the influence of displacement current on output power is about 2% from the results of computation, and becomes strong according to the increase of frequency. The validity of the computation is verified through the comparison with the measured results.
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  • An Approach to Sensorless Detection of Human Input Torque and Its Application to Power Assist Motion in Electric Wheelchair
    Yukiko Kaida, Toshiyuki Murakami
    2006 Volume 126 Issue 2 Pages 137-142
    Published: 2006
    Released on J-STAGE: May 01, 2006
    DOIhttps://doi.org/10.1541/ieejias.126.137
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    A wheelchair is an important apparatus of mobility for people with disability. Power-assist motion in an electric wheelchair is to expand the operator's field of activities.
    This paper describes force sensorless detection of human input torque. Reaction torque estimation observer calculates the total disturbance torque first. Then, the human input torque is extracted from the estimated disturbance. In power-assist motion, assist torque is synthesized according to the product of assist gain and the average torque of the right and left input torque. Finally, the proposed method is verified through the experiments of power-assist motion.
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  • Coaxial Control of Injection Equipments by Master Slave Scheme for a Parallel Speed Control System
    Kiyoshi Ochi, Masami Saeki
    2006 Volume 126 Issue 2 Pages 143-150
    Published: 2006
    Released on J-STAGE: May 01, 2006
    DOIhttps://doi.org/10.1541/ieejias.126.143
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    In this paper, a novel master-slave system is proposed for the coaxial control of injection equipments constituted with two or more drive axes. Each drive axis is basically controlled by the PI speed control system and a new master-slave scheme is introduced for the tracking control of the angles of the two parallel subsystems. The adequacy of the scheme is supported by the controllability of the system. Easiness of the parameter tuning of the controller is clarified from the viewpoint of stability, tracking property, and disturbance rejection property. Simulation result and experimental result are also given for the test equipment.
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  • Proposal of Permanent Magnet Repulsive Maglev Transportation System
    —Possibility of Automobile with Magnetic Levitation—
    Shin-ichi Moriyama
    2006 Volume 126 Issue 2 Pages 151-160
    Published: 2006
    Released on J-STAGE: May 01, 2006
    DOIhttps://doi.org/10.1541/ieejias.126.151
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    This paper describes a maglev transportation system for automobile. The track is an array of permanent magnet blocks, and the levitating body is the bedplate which consists of permanent magnet plates, propulsion coils, levitation coils and guidance coils. The feature of this system is that the automobile equipped with the bedplate is free to approach into the track or to swerve from the track by using four wheels with the lift. The force acting on the levitating body is calculated on the assumption that each permanent magnet can be expressed as a surface current. From the calculation results, it is proven that the automobile of 4.35m length, 1.8m width and 1700kg weight can run at speed of 500km/h against the air resistance force of 3704N on the condition that the battery has an output of 337.5V and a capacity of 190Ah.
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  • Bilateral Teleoperation through Networks
    Kenji Natori, Toshiaki Tsuji, Takahiro Yakoh, Kouhei Ohnishi
    2006 Volume 126 Issue 2 Pages 161-167
    Published: 2006
    Released on J-STAGE: May 01, 2006
    DOIhttps://doi.org/10.1541/ieejias.126.161
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    Nowadays haptics (tactile sensation) is receiving much attentions. To transmit a vivid tactile sensation, real-time processing is necessary. In these circumstances, time delay caused in networks or some devices is a very serious problem. Therefore in this paper, influence of time delay on bilateral systems for haptics is examined.
    At first, the influence is verified by the analysis based on an evaluation index “Transparency". Characteristic behavior of time delay can be found out. Then experimental results via the network between Shinanomachi and Yagami campus (Keio University) are shown. Transmission of vivid tactile sensation of remote environment is realized.
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  • Performance Comparison between a Permanent Magnet Synchronous Motor and an Induction Motor as a Traction Motor for High Speed Train
    Minoru Kondo, Junya Kawamura, Nobuo Terauchi
    2006 Volume 126 Issue 2 Pages 168-173
    Published: 2006
    Released on J-STAGE: May 01, 2006
    DOIhttps://doi.org/10.1541/ieejias.126.168
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    Performance tests are carried out to demonstrate the superiority of a permanent magnet synchronous motor to an induction motor as a traction motor for high-speed train. A prototype motor was manufactured by replacing the rotor of a conventional induction motor. The test results show that the permanent magnet motor is lighter, efficient and more silent than the induction motor because of the different rotor structure.
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  • Development of Electric Cart with Function of Maintaining/Improving Exercise Ability
    —Part I: Design of the Electric Cart System—
    Yasuhiro Ohyama, Jin-Hua She, Hiroyuki Kobayashi, Kiyoshi Naemura
    2006 Volume 126 Issue 2 Pages 174-179
    Published: 2006
    Released on J-STAGE: May 01, 2006
    DOIhttps://doi.org/10.1541/ieejias.126.174
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    This paper explains the development of a three-wheeled electric cart that not only is a means of transportation, but also provides the driver with a way of getting some physical exercise. Based on an investigation of the physiological decline accompanying aging, pedaling was chosen to implement the function of maintaining or improving physical strength; and an ergonomically designed pedal unit was mounted on a cart. An interface board that handles inputs and outputs was assembled to simplify the design of the system. Finally, a simple bilateral master-slave control system was built to test the cart. Experimental results on a fabricated cart demonstrate the effectiveness of pedaling and the usability of the system structure.
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  • Development of Electric Cart with Function of Maintaining/Improving Exercise Ability
    —Part II: H∞ Control of the Electric Cart—
    Jin-Hua She, Yasuhiro Ohyama, Tetsuya Suzuki, Hiroyuki Kobayashi
    2006 Volume 126 Issue 2 Pages 180-185
    Published: 2006
    Released on J-STAGE: May 01, 2006
    DOIhttps://doi.org/10.1541/ieejias.126.180
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    A three-wheeled electric cart is developed for the elderly and people undergoing rehabilitation. A bilateral master-slave system configuration is employed to control the speed of the cart, an impedance model is used to describe the feeling of pushing the pedals, and the controller is designed based on H∞ control theory. Experimental results on a fabricated cart demonstrate the validity and effectiveness of the design methodology.
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  • High Power Factor Converter Control by Instantaneous Single-phase Current for a Maglev System Linear Generator
    Toshiaki Murai, Yasuaki Sakamoto
    2006 Volume 126 Issue 2 Pages 186-191
    Published: 2006
    Released on J-STAGE: May 01, 2006
    DOIhttps://doi.org/10.1541/ieejias.126.186
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    A linear generator, which utilizes the harmonic magnetic field by ground coils, has been developed as an on-board power source for the Maglev system. The linear generator is composed of generator coils, which are in the state of three-phase unbalance, and a PWM converter, which can compensate for the reactive power by detecting instantaneous currents. This paper proposes an improved instantaneous current control, which utilizes only each single-phase current to compensate unbalanced three-phase reactive powers. We analyze the characteristics of this control and verify its performance by numerical simulation and bench tests.
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  • The Development of Linear Generator System Combined with Magnetic Damping Function
    Yasuaki Sakamoto, Toshiaki Murai, Takayuki Kashiwagi, Minoru Tanaka, E ...
    2006 Volume 126 Issue 2 Pages 192-198
    Published: 2006
    Released on J-STAGE: May 01, 2006
    DOIhttps://doi.org/10.1541/ieejias.126.192
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    In the superconducting Maglev system, a method for providing on-board service power is one of the most important subjects of technological development. As a solution, a linear generator is being developed that can collect power without contact by utilizing the harmonic magnetic field of ground coils. It can also generate electromagnetic force between the superconducting magnets and ground coils by controlling the current in the generator coils. By using this controllable electromagnetic force, it becomes possible to add magnetic damping to the electrodynamic levitation system, which is characterized by an intrinsically very small damping force. This paper describes the results of the vehicle running tests of the linear generator using zero-phase current control, combined with a magnetic damping function.
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  • Power Supply to Drive a Magnetron for PFC Gas Resolution
    Hiroyasu Iwabuki, Akihiko Iwata, Hajimu Yoshiyasu
    2006 Volume 126 Issue 2 Pages 199-205
    Published: 2006
    Released on J-STAGE: May 01, 2006
    DOIhttps://doi.org/10.1541/ieejias.126.199
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    A power supply to drive a magnetron for a PFC gas resolution has been developed. The power supply (ratings 5kV, 1A) is composed of a full bridge inverter and a voltage doubler rectifier circuit. The characteristics of the current and electric power of a magnetron with the non-linear load were analyzed. As a result, it was found that the magnetron power and the magnetron peak current are approximately linear to the pulse width when the reactor, which controls the current of magnetron, was inserted in the inverter output. We constructed a trial power supply to drive magnetron. It was confirmed that the trial power supply could continuously control the magnetron output up to 3.5kW. The PFC gas resolution efficiency with microwave plasma is larger than the silent discharge method. Therefore we can expect the realization of a small, highly efficient gas resolution device using microwave plasma.
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Letter
Errata
  • [title in Japanese]
    2006 Volume 126 Issue 2 Pages E3
    Published: 2006
    Released on J-STAGE: May 01, 2006
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    frequency → Frequency Wrong:High-frequency Model Identification of PM Synchronous Motor based on System Identification
    Right:High-Frequency Model Identification of PM Synchronous Motor based on System Identification
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  • [title in Japanese]
    2006 Volume 126 Issue 2 Pages E4
    Published: 2006
    Released on J-STAGE: May 01, 2006
    JOURNAL FREE ACCESS
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    End → end Wrong:Shaft Inserting into Moving Object Using Robot Equipped End Effector with Position Error Sensor
    Right:Shaft Inserting into Moving Object Using Robot Equipped end Effector with Position Error Sensor
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  • [title in Japanese]
    2006 Volume 126 Issue 2 Pages E5
    Published: 2006
    Released on J-STAGE: May 01, 2006
    JOURNAL FREE ACCESS
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    Wrong:Yuichi Yamada1) and Nuio Tsuchida1)
    Right:Yuichi Yamada1), Souichirou Hayakawa1) and Nuio Tsuchida1)
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