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AUTO TUNING OF AN AC SERVO MOTOR USING NOVEL REPETITIVE CONTROL METHOD
Jun Oyama,Tsuyoshi Higuchi,Takashi Abe,Kenichirou Hayashi,Eiji Yamada 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
For tuning the P1D parameters of an AC servo system, even a skillful engineer takes a long time and these parameteis must be re-tuned according to each application In previous woiks, we proposed a lepetitive control method with learning process to drive the horizontal-axis direct-drive robot arm with constant speed and also applied this control method to the position control in which the arm reciprocates between several points In this paper, we propose an auto tuning method of the AC servo motor Using the repetitive control method especially for periodic speed control It is very simple and powerful Availability of the control methods is confirmed experimentally.
The Effect of Asynchronous Carrier on Matrix Converter Characteristics
Jun OYAMA,Tsuyoshi HIGUCHI,Takashi ABE,Eiji YAMADA,Hideki HAYASHI,Takashi KOGA 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
In a matrix converter, input side and output side are coupled with each other through switching elements. Since disturbances on either side affect directly on the other side, it requires a high-speed on-line control system to compensate them.<br/> We proposed in previous papers a new control strategy and an on-line control circuit for a matrix converter. The control circuit could keep the output voltage at commanded value against fluctuation in the supply voltage. Furthermore wave forms of the output voltage and the input current were always kept sinusoidal. The switching pattern was generated by comparing modified voltage references with a carrier. The carrier was synchronized with the supply voltage using a PLL system, which made the control circuitcomplicatedand costly.<br/> This paper discusses on the possibility of an asynchronized carrier. Experiment results show the input current distortion in case of asynchronous carrier is bigger than that of synchronous earner However, the detenoration can be minimized by increased carrier frequency.
Oyama Jun,Higuchi Tsuyoshi,Abe Takashi,Tanaka Keisuke The Korean Institute of Electrical Engineers 2006 Journal of Electrical Engineering & Technology Vol.1 No.1
We proposed a novel segment type switched reluctance motor (SRM) in which the segment core was embedded in aluminum (conductive metal) rotor block in order to increase the mechanical strength and easy manufacturing as well as to improve the performance characteristics and reduce the vibration and acoustic noise. This paper explains the operation principle and the drive system and shows the experimental results in comparison with the VR type SRM.
Jun Oyama,Tsuyoshi Higuchi,Takashi Abe,Keisuke Tanaka 대한전기학회 2006 Journal of Electrical Engineering & Technology Vol.1 No.1
We proposed a novel segment type switched reluctance motor (SRM) in which the segment core was embedded in aluminum (conductive metal) rotor block in order to increase the mechanical strength and easy manufacturing as well as to improve the performance characteristics and reduce the vibration and acoustic noise. This paper explains the operation principle and the drive system and shows the experimental results in comparison with the VR type SRM.
Kunihiro Oyama,Masato Kanzaki,Mitsuko Kondo,Hideyuki Maeda,Kei Sakamoto,Tamami Isaka,Jun Tamaoki,Takamasa Onuki 대한흉부외과학회 2017 Journal of Chest Surgery (J Chest Surg) Vol.50 No.3
Background: To improve postoperative outcomes associated with interstitial pneumonia (IP) in patients with lung c ancer, t he m anagement of t he p ostoperative a cute e xacerbation of I P (PAEIP) was investigated. Methods: Patients with primary lung cancer were considered to be at risk for PAEIP (possible PAEIP) based on a preoperative evaluation. The early phase of this study was from January 2001 to December 2008, and the late phase was from January 2009 to December 2014. In the early phase, chest computed tomography (CT) was performed for patients for whom PAEIP was suspected based on their symptoms, whereas in the late p hase, chest CT w as r outinely p erformed w ithin a few days p ostoperatively. The n umbers o f possible PAEIP cases, actual PAEIP cases, and deaths within 90 days due to PAEIP were compared between both phases. Results: In the early and late phases, surgery was performed in 712 and 617 patients, 31 and 72 possible PAEIP cases were observed, nine and 12 actual PAEIP cases occurred, and the mean interval from the detection of PAEIP to starting treatment was 7.3±2.3 and 5.0±1.8 days, respectively. Five patients died in the early phase, and one patient died in the late phase. Significantly fewer PAEIP-related deaths were observed in the late phase (p<0.05). Conclusion: Identifying patients at risk for PAEIP by routine postoperative CT examinations led to the early diagnosis and treatment of PAEIP, resulting in the reduction of PAEIP-related mortality.
A Study on Transmission Replacement Plan Considering Multiple Supply Networks
Yasumura, Takumi,Tsuji, Takao,Oyama, Tsutomu,Hidaka, Kazuhiro,Koda, Jun,Seki, Tomomichi 대한전기학회 2012 The Journal of International Council on Electrical Vol.2 No.2
In recent years, Japanese electric power supply network equipments are almost at the end of their lifetime. It is an urgent necessity to manage their replacements[1]-[2]. In this paper, replacement planning approach for electric power supply network is studied based on the actual network model. The EENS (Expected Energy Not Supplied) is used as an index for reliability of supply network. The aging effect of equipments is also treated. It is assumed that the retransmission failure probability of single circuit fault is increased due to the aging of the equipments. In our previous papers, single supply network connected to one substation is examined[3]-[4]. On the contrary, multiple supply networks connected to different substations are examined in this paper. If the EENS of individual supply network is used for evaluation, the replacement plan may become too severe. However, evaluating the total EENS in multiple supply networks, the replacement plan becomes flexible.
Sayed Fathi El-Hawari,Norihiko Oyama,Yukako Koyama,Jun Tamura,Takaharu Itami,Tadashi Sano,Kazuto Yamashita 대한수의학회 2022 Journal of Veterinary Science Vol.23 No.4
Background: Problems associated with using inhalational anaesthesia are numerous in veterinary anaesthesia practice. Decreasing the amount of used inhalational anaesthetic agents and minimising of cardiorespiratory disorders are the standard goals of anaesthetists. Objective: This experimental study was carried out to investigate the sparing effect of intravenous tramadol, lidocaine, dexmedetomidine and their combinations on the minimum alveolar concentration (MAC) of sevoflurane in healthy Beagle dogs. Methods: This study was conducted on six beagle dogs. Sevoflurane MAC was determined by the tail clamp method on five separate occasions. The dogs received no treatment (control; CONT), tramadol (TRM: 1.5 mg kg-1 intravenously followed by 1.3 mg kg-1 h-1), lidocaine (LID: 2 mg kg-1 intravenously followed by 3 mg kg-1 h-1), dexmedetomidine (DEX: 2 μg kg-1 intravenously followed by 2 μg kg-1 h-1), and their combination (COMB), respectively. Cardiorespiratory variables were recorded every five minutes and immediately before the application of a noxious stimulus. Results: The COMB treatment had the greatest sevoflurane MAC-sparing effect (67.4 ± 13.9%) compared with the other treatments (5.1 ± 25.3, 12.7 ± 14.3, and 40.3 ± 15.1% for TRM, LID, and DEX treatment, respectively). The cardiopulmonary variables remained within the clinically acceptable range following COMB treatment, although the mean arterial pressure was higher and accompanied by bradycardia. Conclusions: Tramadol-lidocaine-dexmedetomidine co-infusion produced a remarkable sevoflurane MAC-sparing effect in clinically healthy beagle dogs and could result in the alleviation of cardiorespiratory depression caused by sevoflurane. Cardiorespiratory variables should be monitored carefully to avoid undesirable side effects induced by dexmedetomidine.