• Proceedings of the KIPE Conference
• /
• 2011.07a
• /
• pp.202-203
• /
• 2011

본 논문에서는 자동차가 전기모터로 주행하다가 배터리가 방전되면 엔진으로 구동할 수 있도록 연결해 주는 클러치 시스템에 적용된 BLDC 모터의 위치제어기를 제안한다. 클러치 시스템에 사용되는 BLDC 모터의 구동은 Hall 센서로부터 검출된 회전자 위치정보를 이용하여 위치제어를 수행하였다. PHEV 시스템에서는 클러치를 엔진과 전기모터로 연결해야 하므로 정확하고 빠른 위치제어를 위해 위치제어기를 적용하였고, 클러치 연결 시 진동을 최소화하기 위해 속도제어기를 사용하여 엔진의 속도와 클러치 모터의 속도를 동기가 되도록 하였다. 또한 위치제어를 하기 전에 클러치의 초기위치를 맞춰 줘야 하므로 모터의 위치정보를 이용하여 속도제어기와 전류제어기로 모터를 일정한 위치로 이동시켰다. BLDC 모터의 전압제어를 위한 PWM 방법은 기존의 바이폴라 PWM 보다 전류리플이 적은 유니폴라 효과를 내는 새로운 바이폴라 PWM 방법을 사용하였다. 제안된 알고리즘은 시뮬레이션과 실험을 통해 검증하였다.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.18 no.1
• /
• pp.21-28
• /
• 2005

This study tries to analyzes the torque and engaging time generated in a micro-electromagnetic clutch by using FEM. For the purpose of design change and optimization of the micro-electromagnetic clutch, the torque prediction is very important. We employ a mathematical approach based on the electromagnetic principle. For torque prediction, real material properties are substituted to the constructed axi-symmetric FEM model to obtain the analytical torque and engaging time. The predicted torque and engaging time are compared with those obtained by experiments to discuss the validity of torque and engaging time analysis. The analytical results agrees well with experimental data, therefore explaining the validity of the torque and engaging time prediction method.

• Journal of Advanced Navigation Technology
• /
• v.12 no.3
• /
• pp.208-214
• /
• 2008

With the development of the automobile industry, technologies for parts of an automobile with more convenient functions have progressed, but the manual clutch developed at the first phase of inventing means of transport still remains at the early stage of the automatic transmission despite numerous research and efforts. The traditional automatic transmission is mainly used in small cars and personal RV vehicles that include the slipped clutch disk. However, this research seeks an innovative technology that can be applied to all types of transportation operating the clutch, such as small cars, large vehicles, farm machines and vessels. In order to accurately decide the joint timing of the clutch disk according to the output of engine power that differs depending on driving conditions of vehicles, and to apply the half clutch state which frequently occurs in the manual transmission, the rpm of the engine can be used as the base to decide the joint timing of the clutch disk. This research has developed an electronic clutch module that can transmit the engine power by moving and jointing the clutch disk as much as the engine rpm increases.

• Proceedings of the Korean Nuclear Society Conference
• /
• 2004.10a
• /
• pp.655-656
• /
• 2004

1) 제어봉의 전자 클러치는 직류전원 공급 장치에 의해 12V의 직류 전력을 공급받으며 전압 강하에 대한 내성이 좋다. 제어봉은 10V의 전압이 525msec 이상 지속될 때 전자력 상실로 낙하한다. 완전정전(0V)이 발생하여도 직류전원 공급 장치는 500msec 동안 전자클러치에 직류전력을 공급하여 제어봉의 연결 상태를 유지하도록 한다. 2) 정지봉 계통에 대한 전압강하의 영향은 제어회로를 구성하는 전자접촉기의 개방에 의하여 펌프의 전원공급이 차단되고, 그 결과 정지봉이 낙하한다. 정지봉은 펌프의 전원이 상실되면 수압 실린더의 압력 상실로 약 1000msec 후에 낙하한기 시작한다. 그림 2는 제어봉 및 정지봉에 대한 정전 영향을 시간에 따라 표시한 것이다. 3) 1차 및 2차 냉각계통의 부족전압 계전기에 의해 펌프가 정지할 때까지 저유량 신호 및 N/T mismatch 신호에 의한 원자로 정지신호는 발생되지 않는다. 따라서 정지봉 및 제어봉 계통에 적용하고자 하는 순간정전 보상장치는 부족전압 계전기 동작시간 이내의 보상시간에서만 가능할 것이다.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.14 no.5
• /
• pp.2069-2074
• /
• 2013

The use of the electromagnetic clutch water pump for internal combustion engine vehicles saves fuel and leads to a reduction in emissions. The clutch water pump allows the engine cooling system to select the optimum operation condition by using coolant flow rate on/off control. This study investigated the characteristics of fuel consumption and emissions of the diesel engine cooling system using the clutch water pump. The electromagnetic clutch operation reduced by about 49% of engine warm up period at idle condition and controlled the optimum high coolant temperature at driving condition. Therefore, fuel consumption was enhanced by about 5%, and emissions such as HC, CO and $CO_2$ were also reduced to a certain degree even though NOx increased a little bit, compared to those of the conventional water pump under NEDC mode which represents the real driving pattern.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.1 no.1
• /
• pp.101-109
• /
• 1993

Dynamic characteristics of an electro-magnetic clutch transmission system were investigated by using Bondgraph modeling method. Simulation results showed that when the rotor engaged with the armature, the response time of the current, the driver torque, the rotational speed and the relative sliding time between the driver and the driven side decreased, as the gap size between the rotor and the armature decreased and the number of coil turns increased. Also, when the rotor disengaged with the armature, the delay time increased with the decreased gap size and the increased number of coil turns. It was found that the experimental results of the current, the driver torque, the rotational speeds were in good accordance with the theoretical results. The results of this study can be used as basic design materials of the electro-magnetic clutch.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2005.10a
• /
• pp.291-294
• /
• 2005

This paper presents a method of improving performance of an electromagnetic clutch for the next generation tank gun. One of the most important things in the design of the clutch is to satisfy the requirement for the maximum torque even if the torque is varied. To achieve this requirement, it is needed to expand the operation range of the torque. Consequently, we have performed shape changes in order to cancel magnetic flux bottlenecks on the magnetic path. Simulation results from the finite element method show that the method proposed in this paper is proper for the clutch.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.21 no.5
• /
• pp.77-83
• /
• 2020

4WD technology is being actively applied to passenger cars. Therefore, dry multi-plate clutches are used for transfer cases. On the other hand, dry clutches have problems related to large vibrations and poor ride quality. To solve this problem, this paper proposes a multi-plate clutch with an MR fluid. When fastening the multi-plate clutch in the transfer case, the proposed MR clutch was applied to reduce the shock and friction, which is a key component in a four-wheel-drive system. MR multi-plate clutch has a fluid coupling mode and a compression mode. A torque model equation was derived for the optimal design. The analysis was performed using Ansys Maxwell to optimize the design parameters of the multi-plate clutch. Electromagnetic field analysis confirmed the strength of the magnetic field when the number of disks and plates were changed, and the maximum strength of the magnetic field was 0.45 Tesla. By applying this to the torque equation, the spacing between the plates was 2 mm, and the inner and outer diameters of the plates were selected to be 45 mm and 55 mm, respectively. Overall, this paper proposes an optimal design technique to maximize the performance of an MR multi-plate clutch.

• Proceedings of the KIPE Conference
• /
• 2019.07a
• /
• pp.362-363
• /
• 2019

비상발전기를 사용하여 무정전 시스템을 구성할 경우, 발전기 시스템이 정전을 인식하고 비상발전기의 기동하는 시간동안은 정전이 발생함으로 통상적으로 단주기 ESS와 결합한 UPS 시스템을 구축하게 된다. 이 경우 UPS 시스템 구축을 위한 ESS 시스템과 인버터에 대한 부담이 존재한다. 본 논문에서는 비상발전기와 엔진의 동력전달 부 사이에 플라이휠과 전자식 클러치에 의한 새로운 비상발전기 단독형 UPS 시스템을 제안한다.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
• /
• 1988.11a
• /
• pp.49-56
• /
• 1988

자동차의 동력전달 수단으로 사용되는 클러치는 그 기능에 따라 수동식과 자동식으로 구분된다. 전자의 경우 transmission과 engine의 동력을 dry contact mechanism으로 단속 제어하는 반면 후자는 hadraulic torque drive와 engine의 동력을 transmission box내의 기어유에 의한 wet contact mechanism으로 단속 제어한다. 자동식 클러치에 사용되는 paper facing은 cellulose fiber를 기본으로 하여 열경화성 수지 및 무기충진제등을 함유하고 있으나, 특히 무기충진제의 종류 및 첨가량이 paper facing의 마찰특성에 크게 영향을 미친다. 본 연구는 목재펄프(wood pulp), 린터펄프(linter pulp)등의 펄프를 주체로 하고 열경화성 수지와 무기충지제등을 첨가한 마찰재를 제조하여 무기충진제들의 마찰특성에 미치는 영향을 조사함으로써 paper facing의 기초 자료를 얻는데 그 목적이 있다.