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A Fuzzy Logical Optimal Efficiency Control of Permanent Magnet Synchronous Motor
Guang Xu Zhou(주광성),Dong-Hee Lee(이동희),Jin-Woo Ahm(안진우) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
This paper presents a fuzzy logical control method to implement an on-line optimum efficiency control for Permanent Magnet Synchronous Motor. This method real-timely adjusts the output voltage of the inverter system to achieve the optimum running efficiency of the whole system. At first, the input power is calculated during the steady state in the process of efficiency optimizing. To exactly estimate the steady state of the system, this section needs check up the speed setting on timely. The second section is to calculate input power of de-bus. The exact measurement of the voltage and current is the vital point to acquire the input power. The third section is the fuzzy logic control unit, which is the key of the whole drive system. Based on the change of input power of de-bus and output voltage, the variable of output voltage is gained by the fuzzy logical unit. With the on-line optimizing, the whole system can fulfill the minimum input power of do-bus on the running state. The experimental result proves that the system applied the adjustable V/f control method and the efficiency-optimizing unit possesses optimum efficiency, and it is a better choice for simple variable speed applications such as fans and pump.
Zhou, Guang-Xu,Tang, Ren-Yuan,Lee, Dong-Hee,Ahn, Jin-Woo The Korean Institute of Electrical Engineers 2008 Journal of Electrical Engineering & Technology Vol.3 No.1
The electromagnetic parameters of a permanent magnet synchronous motor (PMSM) such as the open load permanent magnet flux, d axis reactance $X_d$, and q axis reactance $X_q$, are most essential to the performance analysis and optimization design of the motor. Based on the numerical analysis of the 3D electromagnetic field, the three electromagnetic parameters of permanent magnet synchronous motors with U form interior rotor structures are calculated by FEA. The rules of the leakage coefficient and reactance parameters changing with the air gap length, permanent magnet magnetism length, and isolation magnetic bridge dimensions in the rotor are given. The calculated values agree well with the measured values. The FEA results are integrated with the self compiled electromagnetic design program to optimize the prototype motor. The tested performances of the prototype motor prove that the method is suitable for the optimization of motor structure.
Study on Efficiency Optimizing of PMSM for Pump Applications
Guang-xu Zhou,Hui-jun Wang,Dong-Hee Lee,Jin-Woo Ahn 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
In view of the operation characteristics of pump application, pump system should have high efficiency and energy saving during the whole operating process. A novel efficiency-optimization control strategy is presented to meet the demand of high efficiency of variable speed high efficiency PMSM. The core of this strategy is the excellent integration of mended maximum torque to current control algorithm, which is based on the losses model during the dynamic and the grade search method with changed step by fuzzy logic during the steady. A TMS320LF2407A DSP-based digital control inverter for variable speed high efficiency PMSM is developed. The performance experiments for control system of variable speed high efficiency PMSM have been completed. The tested result verified that the system can reliably operate with the different control strategy during the dynamic and steady operation, and the system has more perfect performances using the efficiency-optimization control.
Guang-Xu Zhou,Ren-Yuan Tang,Dong-Hee Lee,Jin-Woo Ahn 대한전기학회 2008 Journal of Electrical Engineering & Technology Vol.3 No.1
The electromagnetic parameters of a permanent magnet synchronous motor (PMSM) such as the open load permanent magnet flux, d axis reactance Xd, and q axis reactance Xq, are most essential to the performance analysis and optimization design of the motor. Based on the numerical analysis of the 3D electromagnetic field, the three electromagnetic parameters of permanent magnet synchronous motors with U form interior rotor structures are calculated by FEA. The rules of the leakage coefficient and reactance parameters changing with the air gap length, permanent magnet magnetism length, and isolation magnetic bridge dimensions in the rotor are given. The calculated values agree well with the measured values. The FEA results are integrated with the self compiled electromagnetic design program to optimize the prototype motor. The tested performances of the prototype motor prove that the method is suitable for the optimization of motor structure.
Three New 11,20-Epoxy-ent-kauranoids from Isodon rubescens
Xu Liu,Ji Zhou Wu,Rui Zhan,Wei Guang Wang,Xue Du,Yan Li,Peng Zhang,Jian Xin Pu,Han Dong Sun 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.12
Three rare and new 11,20-epoxy-ent-kaurane diterpenoids, named jianshirubesins D-F (1-3), along with one known analogue (4), were isolated from the aerial parts of Isodon rubescens. Their structures were established by analysis of spectroscopic data. Found in the MTT assay to evaluate the cytotoxicity of compounds 1, 2, and 4, only 1 could selectively inhibit certain cell lines from proliferating. In addition, a simple structure-activity relationship discussion might suggest a new bioactive moiety, different from the α,β-unsaturated ketone group.
Combined Effect of the Prior Deformation and Applied Stress on the Bainite Transformation
Mingxing Zhou,Guang Xu,Li Wang,Haijiang Hu 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.6
There has been a continued interest over the past years in the effects of external stress or prior deformation onthe bainite transformation. In this study, the combined effect of prior deformation and stress on the bainitetransformation was investigated and the interaction between the effects of prior deformation and stress wasdiscussed in detail. The results show that although single deformation and single stress promote the bainitetransformation, their combination cannot promote the bainite transformation to a much larger degree. In addition, atthe early stage of transformation, the promotion effects of prior deformation and stress on the amount of the bainitetransformation are enhanced by each other. However, at the latter stage, the deformation weakens the promotioneffect of the stress. Moreover, prior deformation at a low temperature accelerates the kinetics of the bainite transformationwith stress, but it decreases the amount of the bainite transformation even if the deformation is small.
Kinetics Model of Bainitic Transformation With Stress
Mingxing Zhou,Guang Xu,Haijiang Hu,Qing Yuan,Junyu Tian 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.1
Thermal simulations were conducted on a Gleeble 3800 simulator. The main purpose is to investigate the effects ofstress on the kinetics of bainitic transformation in a Fe-C-Mn-Si advanced high strength bainitic steel. Previousstudies on modeling the kinetics of stress affected bainitic transformation only considered the stress below theyield strength of prior austenite. In the present study, the stress above the yield strength of prior austenite is takeninto account. A new kinetics model of bainitic transformation dependent on the stress (including the stresses belowand above the yield strength of prior austenite) and the transformation temperature is proposed. The new modelpresents a good agreement with experimental results. In addition, it is found that the acceleration degree of stresson bainitic transformation increases with the stress whether its magnitude is below or above the yield strength ofaustenite, but the increasing rate gradually slows down when the stress is above the yield strength of austenite.
Hong-Lin Xu,Guang-Hong Chen,Yu-Ting Wu,Ling-Peng Xie,Zhang-Bin Tan,Bin Liu,Hui-Jie Fan,Hong-Mei Chen,Gui-Qiong Huang,Min Liu,Ying-Chun Zhou 고려인삼학회 2022 Journal of Ginseng Research Vol.46 No.1
Background: Panax ginseng Meyer (P. ginseng), a herb distributed in Korea, China and Japan, exerts benefits on diverse inflammatory conditions. However, the underlying mechanism and active ingredients remains largely unclear. Herein, we aimed to explore the active ingredients of P. ginseng against inflammation and elucidate underlying mechanisms. Methods: Inflammation model was constructed by lipopolysaccharide (LPS) in C57BL/6 mice and RAW264.7 macrophages. Molecular docking, molecular dynamics, surface plasmon resonance imaging (SPRi) and immunofluorescence were utilized to predict active component. Results: P. ginseng significantly inhibited LPS-induced lung injury and the expression of proinflammatory factors, including TNF-a, IL-6 and IL-1b. Additionally, P. ginseng blocked fluorescence-labeled LPS (LPS488) binding to the membranes of RAW264.7 macrophages, the phosphorylation of nuclear factor-kB (NF-kB) and mitogen-activated protein kinases (MAPKs). Furthermore, molecular docking demonstrated that ginsenoside Ro (GRo) docked into the LPS binding site of toll like receptor 4 (TLR4)/myeloid differentiation factor 2 (MD2) complex. Molecular dynamic simulations showed that the MD2-GRo binding conformation was stable. SPRi demonstrated an excellent interaction between TLR4/MD2 complex and GRo (KD value of 1.16 × 10<SUP>-9</SUP> M). GRo significantly inhibited LPS488 binding to cell membranes. Further studies showed that GRo markedly suppressed LPS-triggered lung injury, the transcription and secretion levels of TNF-α, IL-6 and IL-1β. Moreover, the phosphorylation of NF-kB and MAPKs as well as the p65 subunit nuclear translocation were inhibited by GRo dose-dependently. Conclusion: Our results suggest that GRo exerts anti-inflammation actions by direct inhibition of TLR4 signaling pathway.