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성찰적(省察的) APEC과 부산의 미래 - APEC과 한반도의 地經學的 考察과 부산의 발전전략 -
우주호 한국시민윤리학회 2005 한국시민윤리학회보 Vol.18 No.1
APEC은 아시아-태평양 지역에서 경제성장과 협력, 무역과 투자를 활성화시키기 위한 포럼이다. APEC은 지역경제 범위 내에서 협력하는 역할을 했고, 나중에는 무역자유화를 강조하고 있다. 세계화시대에 노동운동의 전망은 매우 암울한 것 같다. 동아시아의 지경학적 요인은 석유, 천연가스 그리고 기타 광물들 같은 자연자원을 확보하기 위해 매우 역동적이고 활기차다. 2005 APEC 정상회의는 부산에서 열린 가장 큰 국제회의다. “함께하는 APEC, 도약하는 부산”이라는 슬로건은 한국정부와 부산시의 기대를 잘 나타내고 있다. 부산은 유라시아대륙의 관문으로서 항만과 공항의 허브로서의 경쟁력을 발전시켜야 한다. 부산은 지경학적 이점을 활용하여 물류산업과 자동차, 조선, 기계부품 등의 산업클러스터의 그랜드 디자인의 계획에 착수해야 한다. APEC is a forum for facilitating economic growth, cooperation, trade and investment in the Asia-Pacific region. APEC has played a role cooperation in regional economic sphere and later on emphasized trade liberalization. The prospects for labor movement in the era of globalization seems very gloomy. The geo-economics fact of East-Asia is very dynamic and exciting to secure the natural resource like oil, natural gas and other minerals. The APEC 2005 Summit Meeting will be perhaps the biggest international event ever held in Busan. The Slogan of "Together APEC, Jumping BUSAN" seems to show the hope of the korean government and Busan metropolitan city. Busan must develop the competitive position of Hub-port of the seaport and airport as the main gate in the continent of Europe-Asia. Busan must start to plan the grand design of logistic industry and industrial cluster of motor, shipbuilding, machine components to utilize the advantage of geo-economics.
Xiuping Wang,Jiawei Zhang,Chunyu Qu,Chuqiao Zhou 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.2
Due to the narrow working space of an in-wheel motor, the heat generated by the motor loss is difficult to dissipate. This makes it easier for the in-wheel motor to demagnetize the permanent magnet due to the mega-temperature, which affects the output efficiency. To solve this problem, an external rotor hub motor is studied. First, in accordance with the theory of magnetic field modulation, the in-wheel motor to be studied is designed. By analyzing the electromagnetic characteristics of the motor, the correctness of the motor design is verified, and the losses of the motor under different working conditions are calculated. To acquire a more rigorous temperature increase record, the magnetic-thermal bidirectional coupling method is utilized to analyze the temperature field under different load conditions. The mechanism of the demagnetization of permanent magnets is analyzed, and demagnetization at different temperatures is obtained by magneto-thermal two-way coupling. Research shows that when the motor is overloaded for a long time, the temperature can reach a maximum of 220 °C. At this temperature, the permanent magnet undergoes irreversible demagnetization, which results in a 93.44% decrease in torque. Finally, temperature increase tests of a permanent magnet motor are carried out to verify the validity of the magneto-thermal two-way coupling analysis.
Jing Yi-Yang,He Biao,Yang Xiang-Yu,Ma Zhi-Min 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.1
Based on the exact analytical method, this paper calculates the no-load back electromotive force, air gap fux density, cogging torque, and electromagnetic torque of outer rotor wheel-hub permanent magnet synchronous motor (PMSM); the calculation results are in good agreement with those of the fnite element method, which verifes the accuracy of the exact analytical method for solving the outer rotor PMSM. On this basis, the second-generation non-dominated sorting genetic algorithm (NSGA-II) is applied to optimize the multiple structural parameters and performance of the motor more quickly. Compared with the initial scheme of the motor, the torque ripple and permanent magnet mass of the optimized scheme is decreased by a quarter; the average electromagnetic torque, efciency is also improved. Finally, the simulation and experimental results show that the proposed method is reasonable and efective.
Li Teng,Yao Ming,Sun Xiaodong 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.1
To further improve the reliability of wheel-driven electric vehicles, this paper studies the fault-tolerant control operation of a fve-phase permanent magnet synchronous hub motor (PMSHM). A fault-tolerant scheme based on model predictive current control (MPCC) is proposed for the fve-phase PMSHM under single-phase open-circuit fault and two-phase open-circuit fault operation. In the implementation of this scheme, the fve-phase PMSHM model during fault operation is discussed, and the coordinate transformation matrices for single-phase fault, adjacent two-phase fault and non-adjacent two-phase fault are derived respectively. Through further analysis, the ofset voltage vector at the time of open-circuit fault can be obtained, and the newly obtained voltage vector can be used as the candidate set for model predictive control. The MPCC method combines duty cycle control and the vector preselection method. Compared with the traditional MPCC scheme, the improved MPCC scheme not only reduces the computation time but also enhances the steady-state performance of the control scheme. Finally, it is verifed that the proposed fault-tolerant scheme based on MPCC can efectively address the diference in open-loop fault operation and improve the reliability of the hub drive system.
Mehmet Onur Genc 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.8
In this study, E-bike, called pedelec due to being driven via a pedal and electric excitation is investigated experimentally based on energy consumption at defined urban road profiles under full electrical mode without pedal usage. The digital twin (DT) model is created based on the powertrain system model to estimate the consumed instant electrical power dependend on voltage, current, torque, and road type classifications. To achieve these targets, a data logging system is designed and programmed to measure consumed electrical power as current and voltage inputs. Road profiles are divided into the asphalt and graded gravel at different slope levels. As next step, the obtained energy consumption data is used in powertrain modeling to create physical E-bike model, which is the input for neural network model representing the DT model. This novel test methodology provides the approaches of energy consumption and driving range calculation in E-bike powertrain system modelling.
시스템 모델링 및 주행 시뮬레이션을 통한 인휠드라이브 타입 6WD/6WS 차량 플랫폼의 주행 거동 분석
이정엽(Jung-Yeob Lee),서승환(Seung-Whan Suh),손웅희(Woong-Hee Shon),유승남(Seung-Nam Yu),한창수(Chang-Soo Han) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.4
A skid-steering method which applied to the various mobile robot platforms currently shows its effectiveness in the specified field areas and purposes. This system contains however, several problems of its intrinsic properties such as slippages occurred by different moving direction between vehicle"s driving and wheel"s rotary and difficulties of driving performance control and so on. This paper deals with the suggestion of suitable control algorithm for 6WD/6WS skid steering wheeled vehicle and verified its feasibility by analyzing the behavior of 6WD/6WS skid-steered wheeled vehicle model and by applying the engineering analytical method to the considered mobile platform. The Performance of vehicle model is evaluated by using slip mode control to follow the steering input and, as a future work, this control algorithm could be applied to real 6WD/6WS in-wheel drive type vehicle finally