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Basic Characteristic of 5-level Inverter with Different Divided DC Link Voltage
Matsuse, Kouki,Matsumoto, Takafumi,Kodera, Yuji Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.2
This paper report on experimental results of 5-level inverter by DC divided link voltage. We have alreday reported that DC divided link valtage comes to be able to reduse harmonic of out line voltage. So we tested whether DC divided link voltage can reduce harmonics in experimental setup. This paper shows simulation results and experimental results. And we confirmed that DC divided link voltage can also apply in experimental setup.
Dynamic Analysis of Product Lifecycle and Sea/Air Modal Choice: Evidence of Export from Japan
Hideki MURAKAMI,Yukari MATSUSE 한국해운물류학회 2014 The Asian journal of shipping and Logistics Vol.30 No.3
Here, we test the hypothesis that commodities at their peak valuation are transported by air, while those at their inception and maturity are shipped by sea, as well as the theory that shippers choose air to transport high-valued commodities. We empirically investigated how the product lifecycle of commodities is reflected by shippers’ choices of air over seaborne transportation. We also assumed that commodities that achieved substantial innovation in their lifecycles would be moved by air transportation so that these commodities could reach targeted markets as quickly as possible to avoid the opportunity costs that might be generated by missed business chances. We constructed two sets of unbalanced panel data of 14 commodities for 24 years drawn from Japan’s customs, demographic, and international statistics. By estimating structural equation systems that consisted of commodity-specific export and export air ratio functions, we found that the product lifecycle of cargo outgoing from Japan exactly matched the upward and downward movement of the air ratio.
Enokijima, Hiroyuki,Oka, Kazuo,Matsuse, Kouki The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.4
This paper presents the experimental test results of the independent vector control characteristics of two three-phase permanent magnet synchronous motors (PMSMs) fed by a five-leg inverter (FLI). Recently, the use of PMSM is more and more spreading in industrial field. It has the features of saving-weight and high-efficiency compared with DC motor and induction motor (IM). The maximum feature of the PMSMs is the realization of high performance position control. The independent position control validates for the factory automation (FA) apparatus as machine tool. If the independent position control of two motors with the FLI may be realized, the belt conveyer used at the FA apparatus as machine tool will become possible not only one dimension but also two dimensions with single inverter. In this paper, experimental results are verified for the independent position control of two PMSMs fed by the FLI with the vector control.
Characteristics of Repetitive Positioning Control of a Linear Pulse Servo Motor
Masayasu Yamamoto,Kouki Matsuse 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
This study aims to realize high precision repetitive positioning control of the linear servo motor. The authors have previously improved the repeatability positioning precision by employing a two-degree-of-freedom PID controller in the positioning control system and by upgrading the drive system. The present study focuses on variable distance repetitive positioning control, rather than equal distance positioning, and investigates the repeatability positioning precision.<br/>
Analysis of Multi Level Current Source GTO Inverter for Induction Motor Drives
Takayuki ARASE,Kouki MATSUSE 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
This paper discusses a triple stage current source GTO inverter system for high power motor drives.The energy rebound circuit of the triple stage inverter not only controls the spike voltage of the GTD inverter but also facilitates PWM control of the thynstor rectifier operated at unity fundamental input power factor Based on Pspice simulation and experiments, the principles and PWM pulse pattern for removing specific lower harmonics in the inverter's output current are discussed in detail.
Position and Speed Controls of Two Permanent Magnet Synchronous Motors Fed by a Five-Leg Inverter
Atsushi Hara,Tsutomu Tanaka,Kouki Matsuse 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents the experimental and simulation test results of the independent vector control characteristics of two three-phase permanent magnet synchronous motors (PMSMs) fed by a five-leg inverter (5LI). The 5LI is a single inverter that can drive two motors independently. In this paper, experimental results are verified for the independent position and speed control in constant torque region of two PMSMs fed by the 5LI with vector control. Simulation results are verified for the independent position and speed control including constant power region of two PMSMs fed by the 5LI with the vector control.
Hiroshi Yoshizumi,Tatsuya Yamada,Kouki Matsuse,Kiyoaki Sasagawa 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
The purpose of this work is to find out performance of speed sensorless direct-field-orientecl controlled induction motor operating in very low speed region using adaptive flux observer. We discuss on the effect of the characteristic of A/D converter to estimated motor speed in this control system by simulation.
Adjustable High Frequency Quasi-Resonant Inverter for Induction Heating
Saso, Kazuki,Ito, Takahiro,Ishimaru, Yusuke,Matsuse, Kouki,Tsukahara, Masayoshi The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.1
This paper presents the considerations of driving the Adjustable Frequency Quasi-Resonant Inverter Circuit in the high frequency. This inverter is requested to output frequency from 160kHz to 400kHz. Resonant inverter used for metalworking by the induction heating. In induction heating, high frequency can heat the shallow point, and low frequency can heat the deep point. So when heated depth is replaced, the frequency that inverter must output is different. It is necessary for the inverter to output two or more frequencies. In addition, in the heat-treatment called the hardening, only the metal surface must be heated. So, to heat-treat metal that a radius is small, it is necessary for the inverter to output high frequency. This inverter can output the frequency more than 100kHz by using Power Metal Oxide Semiconductor Field Effect Transistor (MOSFET) as power device. The circuit includes the first resonant capacitor and second one with a one-way short-circuit switch. Because synthetic series capacitance is varied by manipulating the switch, this inverter can change a period during a half period. We confirmed this inverter can output an arbitrary frequency by the experiment.
Kenji Ohba,Norisato Mitsutake,Michiko Matsuse,Tatiana Rogounovitch,Nobuhiko Nishino,Yutaka Oki,Yoshie Goto,Kennichi Kakudo 대한병리학회 2019 Journal of Pathology and Translational Medicine Vol.53 No.2
Although papillary thyroid carcinoma (PTC)–type nuclear changes are the most reliable morphological feature in the diagnosis of PTC, the nuclear assessment used to identify these changes is highly subjective. Here, we report a noninvasive encapsulated thyroid tumor with a papillary growth pattern measuring 23 mm at its largest diameter with a nuclear score of 2 in a 26-year-old man. After undergoing left lobectomy, the patient was diagnosed with an encapsulated PTC. However, a second opinion consultation suggested an alternative diagnosis of follicular adenoma with papillary hyperplasia. When providing a third opinion, we identified a low MIB-1 labeling index and a heterozygous point mutation in the KRAS gene but not the BRAF gene. We speculated that this case is an example of a novel borderline tumor with a papillary structure. Introduction of the new terminology “noninvasive encapsulated papillary RAS-like thyroid tumor (NEPRAS)” without the word “cancer” might relieve the psychological burden of patients in a way similar to the phrase “noninvasive follicular thyroid neoplasm with papillary-like nuclear features (NIFTP).”