• The Transactions of the Korean Institute of Electrical Engineers B
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• v.48 no.11
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• pp.597-603
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• 1999

Due to its simple construction, operation steadiness and low cost, claw pole step motor is widely used for OA machine and automobile. This paper deals with analysis fo claw pole motor, especially eyeing to dynamic characteristics. To analyze dynamic characteristics of claw pole step motor, torque development in each angular step of rotor are surveyed and torque equation is drived using permeance method. To adopt the airgap MMF, the magnetic equivalent circuit of the motor is introduced. On the base of the magnetic equivalent circuit, the air gap flux equation is derived. To get a optimum design of the motor, the torque characteristic is studied in variation of coil data and remanence value of permanent magnetic material.

• Proceedings of the KIEE Conference
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• 2000.07b
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• pp.870-872
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• 2000

This paper deals with the effect of rotor thickness variation and winding method in high torque hybrid Permanent Magnet(PM) step motor. As these parameters vary. The flux distribution in airgap and torque characteristics are influenced, which is related to output power. efficiency and cost. These parameters and characteristic variations were evaluated by using Finite Element Method (FEM) and experiment method. From these results. Characteristic analysis for the optimum design was studied and prototype motor was made to test performance analysis.

• Proceedings of the KSME Conference
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• 2001.06b
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• pp.70-75
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• 2001

In this study, we developed a measuring system utilizing machine vision for measuring the precision of positioning of micro stepping motor. The measuring system equipped with CCD Camera, ring illumination and diffuser measures the repeatability and the hysterisis of a micro stepping motor by means of the pointer attached to the motor directly. With the measuring system, it was possible to measure the precision of the micro stepping motor in the resolution of $50{\mu}m$.

• Journal of the Korean Institute of Telematics and Electronics D
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• v.35D no.12
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• pp.75-82
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• 1998

Many multiplexing techniques are proposed for high storage densities in a volume hologram. In this paper, we present a hybrid angularly and spatially multiplexed volume holographic memory system. Multiple holograms are recorded by using reference and object waves with different incident angles and positions that are changed by step motors. A hologram is written by exposing the crystal with recording time schedule to the interference pattern of the object beam and a reference plane wave. Finally, we show experimental results of the storage of three layers of 300 multiplexed holograms in a LiNbO$_3$ : Fe crystal.

• Proceedings of the Acoustical Society of Korea Conference
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• spring
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• pp.345-348
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• 2002

본 연구에서는 128개의 능동소자로 구성된 convex형 초음파 탐촉자를 회전시켜 3차원 입체영상을 구현 할 수 있도록 하는 구동부를 설계 및 제작하여, 3차원 입체 영상 진단용 초음파 섹터 트랜스듀서를 개발하였다. 탐촉자는 중심주파수 4.5Mhz, 대역폭 $66\%$로 제작되었으며, 구동부는 탐촉자의 축을 스텝모터와 평기어를 이용해 회전시킴으로써 3차원 입체영상을 획득할 수 있게 고안하였다. 그리고 피부와 유사한 고분자재료를 사용하여 탐촉자의 회전반경과 동일하게 음향커버를 설계 및 제작하였다. 제작된 초음파 섹터 트랜스듀서는 정밀한 각도 제어 및 구조적 안정성이 확보되었음을 확인 할 수 있었다.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.38 no.1
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• pp.1-9
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• 1989

In this paper, an efficient method of a hybrid stepping motor is proposed using permeance method. To be specific, hybrid stepping motor is modelled firstly as an equivalent nonlinear magnetic circuit including the saturation effects of iron parts, and then the static holding torque of the motor is calculated as a function of each design factor via Newton-Raphson's method. To show the validities of the proposed method, a prototype of hybrid stepping motor for 5 1/4 inches FDD header drive is made and tested in laboratory. As a result, the experimental data for the static holding torque is shown to be within 10% error compared with that of the simulated results.

• Proceedings of the KIEE Conference
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• 2001.10a
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• pp.230-232
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• 2001

The camera system we researched has two stepping motors for the pan and tilt operation, and the human face tracking algorithm. Recently, this kind of the camera is used in PC communication, telecommunication vision meeting and tele-lecture. This paper discusses the smooth speed control method of this camera when the face is moved to up, down, left and right direction. We used a mean shift algorithm for the face-tracking, proposed the speed control algorithm using a fuzzy logic and certified this characteristics with the experiment.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2231-2233
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• 2001

현대사회에서 네트윅이 차지하는 비중은 점점 커져가고 있다. 따라서 네트윅을 활용할 수 있는 많은 노력들이 이루어지고 있다. 네트웍 프로토콜의 하나인 TCP/IP프로토콜을 이용한 LAN은 다른 정보를 처리하는 장치들을 연결하고, 자원을 공유하며, 고속의 통신을 가능하게하는 시스템이다. 본 논문은 TCP/IP 프로토콜과 장비와 장비 사이의 직렬 통신 방법인 RS232를 연계하는 게이트웨이를 통한 시스템 제어와 모니터링을 목적으로 하고자 한다. 제어 대상 시스템은 여러 가지의 적용이 가능하지만 본 논문을 위해 80C19SKC CPU로 제어되는 스텝 모터를 사용하였다.

• Proceedings of the KIEE Conference
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• summer
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• pp.749-751
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• 2004

This paper analyzed the characteristics of the claw pole PM step motor by using 3D FEM. In case of analysing this type of motor, 3 dimensional analysis is necessary for an accurate analysis due to the magnetizing component of the z-axis direction. As a main design variable, the magnetization, width and the effects of skewing was selected. The variation of the detent torque and the back EMF depending on the shape of the pole is also shown.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2245-2247
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• 2003

The present DC Motor or STEP Motor have been used in electronic work or products. There have been researches that let those Motor improved more conveniently in controlling and measuring those than before. By controlling and measuring those, the convenience of users and the functions of products can be improved. In addition, the responding speed of whole system can be increased by improving it of controlling and measuring. Therefore it is necessary that we develop motor motion application. Because of this necessity, Neural-Network was used to improve the responding speed of controlling and measuring, and a new application was developed for the convenience of users. This thesis showed efficiency of controlling methodology by Neural-Network superior to others in correctness and speed. We are intend to verify its appropriateness though experimentations.