• 한국산업융합학회 논문집
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• 제4권4호
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• pp.379-386
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• 2001

The lower toughness or brittle materials for mechanical test lead to the additional requirement that applied displacements be controlled with high resolution. Biaxial tension and shear tester using stepper motor with harmonic driver is shown. The device had to be high resolution so that the crack initiation process of slow extension and steady growth could be examined, Grip plates were connected to a linear bearing and actuator. The actuators consisted of stepper motors with harmonic driver connected to pre-loaded ball screw and nut assemblies. The encoders and motor controllers were connected to a personal computer so that arbitrary displacements histories could he prescribed in normal and tangential directions. The linear bearings were used to react loads perpendicular to their axes while allowing low friction, parallel movement of the attached grips. Load cells measured the reactions normal and tangential. the loads measured the reactions were recorded by the computer.

• Journal of Electrical Engineering and Technology
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• 제12권5호
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• pp.1991-2000
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• 2017

This paper presents a compensative microstepping based position control with passive nonlinear adaptive observer for permanent magnet stepper motor. Due to the resistance uncertainties, a position error exists in the steady-state, and a ripple of position error appears during operation. The compensative microstepping is proposed to remedy this problem. The nonlinear controller guarantees the desired currents. The passive nonlinear adaptive observer is designed to estimate the phase resistances and the velocity. The closed-loop stability is proven using input to state stability. Simulation results show that the position error in the steady-state is removed by the proposed method if the persistent excitation conditions are satisfied. Furthermore, the position ripple is reduced, and the Lissajou curve of the phase currents is a circle.

• 한국CDE학회논문집
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• 제22권2호
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• pp.190-201
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• 2017

This paper proposes how to solve a problem of FDM 3D printer's irregular output when changing volume of extrusion, adjusting movement speed of the printer's head and a way to fill new inner part. Existing slicers adjust directly to change the rotation speed of the stepper. In this method, the change of the extrusion area is delayed due to the gap between the stepper and the nozzle, so that precise control is difficult. We control the extrusion area adjusting the moving speed of the print head and making constantly the rotation speed of the stepper. Thus, the output time can be shortened by generating an efficient path having a short travel distance. For evaluation, we applied our method to lithophanes with detailed variation. Comparing existing methods, our method reduced output time at least 30%.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 추계학술대회 논문집 학회본부 B
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• pp.341-344
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• 2000

본 논문에서는 stepper motor 나 BLDC motor를 구동하기 위하여, 최신 microcontroller, PC, control IC board 등으로 구성된 새로운 시스템을 설명하는데 목적이 있다. 이 시스템에서는 인터넷으로 전송되는 microcontroller program를 이용하여 SPDS(smart power development system)을 구동시키고, 이로 인하여 dedicated drive IC를 제어하여 stepper 또는 BLDC motor를 구동시키게 되며, 원격지에 있는 사용자의 motor를 제어함을 목표로 하고 있다. 본 논문에서 사용된 drive IC 는 SGS-Thomson 제품으로써 stepper motor 용으로 L6205/6/7/8, 그리고 BLDC motor 용으로 L6235 이다. SPDS는 ST92F120 16-bit microcontroller를 사용하고 있다. 이 논문에서는 인터넷 Protocol Converter에 의한 프로그램 전송, Operating System Program 및 Driver Software Program의 생성 및 구성, Drive IC의 구성 및 특징, SPDS 의 hardware 및 software 의 구성 등에 대하여 설명한다.

• 전기의세계
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• 제29권10호
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• pp.660-666
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• 1980

The finite leement method is a effetive analysis technique for obtaining approximate solutions of continuum problems with boundary conditions. This paper deals with the programming for the application of this method and the preciser analysis of the magnetic field in the air gap of the linear stepper motor by the method. The finite element analysis based on the variational principle is adopted and the computer program for reducing input data and a large number of the memory words required by the system matrix is presented. The 2-dimensional analysis of the air gap is made and several cases according to varying the position are considered.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2010년도 춘계학술발표논문집 1부
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• pp.357-359
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• 2010

본 논문에서는 논리 설계를 위해서 I-ROB 3000이라는 로봇 키트를 사용하여 논리 설계를 검증하였다. 이 검증에는 iRoV-Lab 3000의 장착된 로봇 모듈인 FPA 모듈,Stepper Motor 모듈,적외선 송수신센서 모듈, 카메라 모듈,RF 모듈 LED,TEXT LCD, 7-segment를 제어하기 위한 FPGA를 사용하며,FPGA설계를 위해 Schematic Design 또는HDL에 대해 연구한다.로봇 설계 시스템의 내부구조를 이해하고 개발환경을 구축할수 있다. 로봇의 구성요소와 각각의 구성요소(Sensor 모듈,display 모듈, Stepper Motor 모듈,RF 모듈)의 동작 원리를 개발한다.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2010년도 춘계학술발표논문집 1부
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• pp.360-362
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• 2010

본 논문에서는 SoC 키트에 해당하는 iRoV-Lab 3000의 장착된 로봇 모듈인 FPA 모듈, Stepper Motor 모듈, 적외선 송수신 센서 모듈, 카메라 모듈, RF 모듈 LED, TEXT LCD, 7-segment를 제어하기 위한 FPGA를 사용하며, FPGA설계를 위해 Schematic Design 또는 HDL에 대해 연구한다. FPGA의 내부구조를 이해하고 개발환경을 구축할 수 있다. 로봇의 구성요소와 각각의 구성요소(Sensor 모듈, display 모듈, Stepper Motor 모듈, RF 모듈)의 동작 원리를 개발한다.

• 융합신호처리학회논문지
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• 제25권2호
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• pp.52-57
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• 2024

난류 경계층 내부 와류 구조물 형상을 측정하기 위해 열선 유속계(Hot-wire sensor)를 스테퍼 모터 컨트롤러(Stepper motor controller)에 고정하여 측정 지점으로 이동시켰다. 유동장 내 표면 근처 유속은 상대적으로 느려 차후 측정 데이터 해석 시 신호처리 과정에서 전자파 간섭으로 민감하게 반응하게 된다. 전자파 잡음은 주로 컴퓨터나 기타 전자 장비의 전원 공급에서 발생하는데, 실험 장비 중 전원이 활성화된 스테퍼 모터(Stepper motor)에서 전자파 잡음이 열선 유속계와 연결된 BNC 케이블로 유입되었다. 이는 열선 유속계를 이동시키기 위해 모터 컨트롤러(Motor controller)에 전원 공급이 인가되면, 오실로스코프 화면에 전자파 잡음이 나타나는 것을 확인하였다. 열선 유속계에서 측정된 데이터에 예상치 못한 잡음이 포함될 가능성이 있으므로, 이를 감소시키고 측정 과정에서 신호대 잡음비(Signal-to -Noise Ratio, SNR)를 향상하도록 연결 케이블을 차폐시키고 전자파가 차단되는 컴퓨터로 교체하였다.

• 한국정밀공학회지
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• 제11권1호
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• pp.150-156
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• 1994

To meet the process requirement of semiconductor device manufacturing, it is necessary to improve the alignment accuracy in exposure equipments. We developed the excimer laser stepper and will describe the methodology for alignment measurement and experimental results. Our wafer alignment system consists of off-axis optics, TTL(Through The Lens) optics and high precision stage. Off-axis alignment utilizes the image processing and /or diffraction from thealign marks of off-centered chip area. On the other hand, TTL alignment can be used for the die-by-die alignment using dual beam interferometry. When only off-axis alignment was used, the experimental alignment error(lml+3 .sigma. ) was 0.26-0.29 .mu. m, and will be reduced down to 0.15 .mu. m by adding TTL alignment.

• Journal of Welding and Joining
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• 제31권4호
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• pp.17-22
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• 2013

The excellent beam quality of high power fiber lasers are commonly used for remote welding applications in body job applications. The Welding speed and productivity is unmatched with any other welding technology including resistance spot welding or traditional laser welding. High tooling cost for clamping and bulky safety enclosures are obstacles which are limiting the use. With the newly developed Laser stitch welding gun we have an integrated clamping in the process tool and the laser welding is shielded in a way that no external enclosure is needed. Operation of this laser welding gun is comparable with resistance spot welding but 2-times faster. Laser stitch welding is faster than spot welding and slower than remote welding. It is a laser welding tool with all the laser benefits like welding of short flanges, weld ability of Ultra High Strength steel, 3 layers welding and Aluminium welding. Together with low energy consumption and minimum operation cost of IPG fiber laser it is a new and sharp tool for economic car body assembly.