• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부A
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• pp.52-54
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• 1998

LOA is the linear electromechanical device that mover is similar to secondary conductor of LIM. The mover reciprocates along stroke by supplying the alternating current to primary coil. LOA is the simpler and more efficient than other linear apparatus using the rotary motor because LOA produce the thrust force without any mechanical converter such as cam, clutch, belt, rack and pinion, etc. This paper deals with the static characteristics of moving coil type LOA by virtual work method, FEM analysis and experiment Results show that thrust force increases when mover travels form center to both ends.

• 한국정밀공학회지
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• 제25권6호
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• pp.126-133
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• 2008

Linear motors are efficient mechanism that offers high speed and positioning accuracy. By eliminating mechanical transmission mechanisms such as ball screw or rack-pinion, much higher speed and greater acceleration can be achieved without backlash or excessive friction. However, an important disadvantage of linear motor system is its high power loss and heating up of motor and neighboring machine components on operation. For the application of the linear motors to precision machine tools an effective cooling method and thermal optimizing measures are required. This paper presents an investigation into the thermal behavior of linear motors with the objective of deriving the optimum cooling conditions. To reach these goals several experiments were carried out, varying operating and cooling conditions. From the experimental results, this research proposed cooling conditions to improve the thermal characteristics of the linear motors.

• 한국산업융합학회 논문집
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• 제25권6_1호
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• pp.953-959
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• 2022

In this paper, the design result of robotic tools and the development of robot control system for chemical coupler assembly are presented. This research aims to eliminate the risk of chemicals exposed to human operators by developing the robotic tools and robot automation system for chemical tank lorry unloading that were done manually. Due to tight tolerance between couplers, even small pose error may result in very large internal force. In order to resolve the problem, the 6-axis compliance device is employed, which can provide not only enough compliance between couplers but also F/T sensing. The 6-axis compliance device having large force and moment capacity is designed. A simple linear gripper with rack-and-pinion is designed to grasp two sizes of couplers. The proposed robot automation system consists of 6-DOF collaborative robot with offset wrist, 6-axis compliance device with F/T sensing, linear gripper, and two robot visions.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2024년도 제69차 동계학술대회논문집 32권1호
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• pp.193-194
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• 2024

스마트홈과 연동하는 안전한 방범창은 외부의 침입자를 차단하고 주거 내의 물품 도난 및 개인의 신변을 보호하기 위한 안전설비로 다양한 형태의 방범창이 존재한다. 스마트홈은 건물 내의 센서가 화재를 감지하면 방범창 내부의 원격시스템이 자동으로 방범창을 매우 짧은 시간 안에 개방할 수 있도록 설계한다. 화재 등 재난시 상하부 방법창이 자동으로 개폐되도록 랙피니언을 이용하여 방범창의 위쪽 창틀을 상승시켜 창살이 움직일 수 있도록 개방하고 동시에 아래쪽 창틀이 회전하도록 구성하여 화재 및 폭우 등에 인명피해를 줄일 수 있도록 설계한다. 스마트홈 시스템과의 연계로 재난을 미리 감지하고 탈출구를 개방한다면 신속하고 안전한 대피가 가능하고, 기존의 프레임 부분 변경에 간단한 시스템만 변경하여 적용할 수 있어, 간단한 구조로 설치할 수 있고 낮은 비용으로 스마트홈을 구성할 수 있다. 특히 스마트홈과 연동하여 재난을 미리 감지하고 탈출구를 개방함으로써 신속하고 안전한 대피가 가능하여 다양한 재난을 대비할 수 있다.

• 한국산학기술학회논문지
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• 제18권10호
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• pp.717-724
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• 2017

콘크리트 매립형 궤도를 운행하는 트램의 주행 안전성을 향상시키기 위해 핵심 구성품인 대차를 개발하고 제작하여 시험 차체와 조립한 후, 단거리 급곡선 급경사 궤도를 건설하고 시험운행을 실시하였다. 대차의 급곡선 주행 중 차륜 플랜지와 매립형 궤도의 간섭을 검토할 수 있는 산식을 제시하였고, 산식 결과에 따라 궤도를 설계하였다. 간략화된 계산식을 도출하여 곡선에서 탈선계수와 윤중감소율을 추정하였다. 단거리 급경사 급곡선 매립형 궤도에서 대차와 차체가 주행할 때에 차체의 가속도를 계측하였고, 영상 시스템을 통해 차륜과 궤도의 인터페이스 상태를 점검하였다. 계산 추정 결과에 따르면 차륜의 탈선계수와 윤중감소율은 안전기준 이하였는데, 실제 주행 시험 중에도 탈선은 발생하지 않았고, 가속도 계측 결과도 주행 안전기준을 만족하였다. 또한, 차륜과 궤도의 간섭은 발생하지 않았고, 영상 모니터링 결과도 차륜의 올라타기 등 탈선조짐은 발견되지 않았으며, 중앙의 피니언과 랙이 원활히 접촉하면서 양호한 주행안전성을 보여주고 있었다. 외부 소음 계측을 통해서 소음 기준을 만족하고 있음을 확인하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1991년도 하계학술대회 논문집
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• pp.47-50
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• 1991

LPM(Linear Pulse Motor) provide direct and precise position control of bidirectional linear motion. LPM is not subject to the same linear velocity and acceleration limitations inherent in systems converting rotary to linear motion such as lead screws, rack and pinion, belt and pulley drives. With LPM, all the thrust force generated by the motor is efficiently applied directly to the load. And speed, distance, and acceleration are easily programmed in a highly repeatable fashion. Potential industrial and application fields of LPM include PCB assembly, industrial sewing machines, automatic inspection, coil winder, medical uses, conveyer system, laser cut and trim systems, semiconductor wafer processing, OA instruments etc. This paper describes various design parameter of LPM such as magnetic ciucuit construction methods, phase number and tooth number per pole, permanent magnet and coil mmf, tooth geometries. And to solve the problems of existing control methods, in this paper, a new control method of the LPM is proposed throughout modern control theory.

• 연구논문집
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• 통권25호
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• pp.91-98
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• 1995

Recently, improving the energy efficiency of a pneumatic system and reducing the consumption of compressed air were a concern of scholars at domestic and abroad. The using fields of a pneumatic system are widely used in factory automation of manufacturing line, chemical factories with explosiveness danger and petroleum industries etc. In particular, pneumatic cylinder is applied to feeding work of workpiece. jig tools and press mechanism, reciprocation and rotary motion with rack and pinion. In this study, the experimental apparatus consisted to pneumatic cylinder, dual supply pressure regulator and solenoid valve. The dual supply pressure regulator connected to outlet port of solenoid valve. The supply pressure($4.5kg_f/cm^2$) of compressed air goes into the rodless chamber 1 to drive the piston rod forward which is named working stage. The supply pressure ($2kg_f/cm^2$) of compressed air goes into the rod chamber 2 to drive the piston rod backward which is named no-working stage. Accordingly, the research results of this study can be obtained to Energy-Saving Effects of the compressed air about 35%.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 춘계학술대회 논문집
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• pp.449-450
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• 2006

Development of a feed drive system with high speed, positioning accuracy and thrust has been an important issue in modern automation systems and machine tools. Linear motors can be used as an efficient system to achieve such technical demands. By eliminating mechanical transmission mechanisms such as ball screw or rack-pinion, much higher speeds and greater acceleration can be achieved without backlash or excessive friction. However, an important disadvantage of linear motor system is its high power loss and heating up of motor and neighboring machine components on operation. For the application of the linear motors to precision machine tools an effective cooling method and thermal optimizing measures are required. In this paper presents an investigation into a thermal behavior of linear motor cooling plate. FVM employed to analyze the thermal behavior of the linear motor cooling plate, using the ANSYS-CFX.

• 대한기계학회논문집
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• 제10권6호
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• pp.870-875
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• 1986

본 연구에서는 랙의 이끝부분을 full-rounded tip으로 설계한 후, 이에 의하 여 창성되는 피니언의 이뿌리곡선을 구하여 전체치형을 완성하였다. 그리고 합성치 형기어의 미끄름율, 유효이뿌리원에서의 공칭굽힘응력과 두쌍접촉호의 길이대 원호부 분접촉호의 길이의 비인 접촉계수를 해석적인 방법으로 구하였다.또한 이들 특성들 과 물림율등 제특성을 비교.검토하여 공구압력각, 인벌류우트부분의 크기를 나타내는 물림각 및 원호반경등의 변화에 대한 제특성의 변화를 고려한 합성치형의 성능을 향상 시킬 수 있는 설계방법을 구하였으며, 합성치형과 표준인버류우트치형을 비교하였다.

• 한국생산제조학회지
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• 제21권1호
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• pp.182-189
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• 2012

This study suggests a dynamic design process for deciding properly design parameters of a mass-spring type Wave Energy Converter (WEC) to achieve sufficient energy conversion from wave to power generator. The WEC mechanism, in this research, consists of a rigid sprung body, a platform, suspension springs and dampers. The rigid sprung body is supported on the platform via springs and dampers and vibrates translationally in the heave direction under wave excitation. At last the resulting heave motion of the sprung body is transmitted to rotating motion of the electric generator by rack and pinion, and transmission gears. For the purpose of vibration analysis, the WEC mechanism has been simply modelled as a mass-spring-damper system under harmonic base excitation. Its maximum displacement transmissibility and steady state response can be determined by using elementary vibration theory if the harmonic ocean wave data were provided. With the vibration analysis results, the suggested dynamic design process of WEC can determine all the design parameters of the WEC mechanism, such as sprung body mass, suspension spring constant, and damping coefficient that can give sufficient relative displacement transmissibility and the associated inertia moment to drive the electric generator and transmission gears.