• Journal of the Korean Society for Precision Engineering
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• v.20 no.9
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• pp.40-46
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• 2003

Synchronizing errors between the spindle motor and the z-axis motor directly influences the cutting characteristics and the thread quality in tapping, because the tapping process is accomplished by synchronizing the movement of the z-axis with the revolutionary spindle motion. Generally synchronizing errors are decided by tile parameters of the servo system and commanded velocity. The excessive synchronizing errors which are induced by the parameter mismatch and high cutting velocity can cause tap breakage due to the abrupt increase of cutting torque or damage the thread accuracy by overcutting the already cut threads. In this paper, the influences of the synchronizing errors on the tapping characteristics in the ultra high-speed tapping will be described and a minimum level of synchronizing errors necessary to maintain the quality of the cut thread will be presented.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2003.04a
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• pp.448-453
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• 2003

This paper researched about technique of Opened CNC that were able to adapt themselves to rapid development of software and hardware. It is basic research what develop a scheme whereby technic make property. This paper theorized about to realize Opened CNC Software which is developing CNC Software flow from building Windows CE operating system's image that is possible realtime acting and multitasking. And Opened CNC Software's component designed independent classified modules. Classify Opened CNC Software's component which was consisted of basic OS Kernel, NC Code parser, Servo Motor Control, Software PLC, MMI(Man-Machine Interftce). And show there's functional example

• Journal of the Korea Computer Industry Society
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• v.9 no.3
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• pp.129-136
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• 2008

This paper implement image gradient detection algorithm with high-performance DSP. First the NTSC color image convert to B/W image. The image gradient detect with Hough transform after edge detection image from the B/W images. The value of image gradient detection control the servo motor to original position of the NTSC camera if camera base to the left or right tilt.

• Proceedings of the KIPE Conference
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• 2002.07a
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• pp.138-141
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• 2002

BLDCM(Brushless D.C. Motor) is widely used for industrial application because of high efficiency and high power density Especially, in servo system and home appliance, BLBCM is very useful due to high control performance and low acoustic noise. In this paper, 2.5HP rated BLDCM controller and drive was developed for tread mill application. The prototype BLDCM has 4 poles rotor and 24 slots stator. Ferrite was used as a rotor magnet due to the cost and temperature characteristic. For the stable operation of tread mill, over current and high temperature can be detected by the DSP controller. For the commutation signal, switching patterns from the sensorless circuit and hall sensor signal are used in the DSP controller.

• Proceedings of the KIPE Conference
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• 2002.07a
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• pp.142-145
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• 2002

A new scheme to estimate machine inertia in low speed is proposed in this paper. It is necessary to consider the machine parameter of low speed instantaneous observer to precise control in servo system, which has frequent load variation and speed change. To estimate machine parameter, especially the moment of inertia, Reduced-Order Extended Luenberger Observer (ROELO) is applied. The effectiveness of the proposed ROELO is showed by simulation.

• Proceedings of the KIPE Conference
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• 2002.07a
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• pp.170-173
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• 2002

시스템이 슬라이딩모드의 존재조건을 만족하는 경우, 전동기의 상태가 전동기의 파라미터에 의존하지 않고 결정되는 절환 초평면에 수렴하기 때문에 파라미터에 불감한 응답을 나타낸다. 본 연구는 소형 유도전동기에 의한 외란 및 파라미터의 변동에 대하여 로바스트(robust)와 동시에 정확한 응답을 나타내는 교류서보 전동기 구동시스템을 실현하는 것이다. 이를 실현하기 위해서 가변구조 제어이론에 기초한 슬라이딩모드 제어를 적용하여 유도전동기 자계 슬립주파수형 벡터제어를 실현한다. 이상적인 전동기에 대한 시뮬레이션의 결과에 의해서 관성, 점성마찰계수, 부하 토오크 등 의 파라미터의 변동 및 외란에 대하여 로바스터성이 있다는 것을 알 수 있고 슬라이딩모드 제어의 도입이 교류전동기 서보제어에 유효한 것을 확인하였다.

• Proceedings of the KIPE Conference
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• 2003.07b
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• pp.799-802
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• 2003

시스템이 슬라이딩모드의 존재조건을 만족하는 경우, 전동기의 상태가 전동기의 파라미터에 의존 하지 않고 결정되는 절환 초평면에 수렴하기 때문에 파라미터에 불감한 응답을 나타낸다. 본 연구는 소형 유도전동기에 의한 외란 및 파라미터의 변동에 대하여 로바스트(robust)와 동시에 정확한 응답을 나타내는 교류서보 전동기를 이용한 서보 시스템을 설계한 것이다. 이를 실현하기 위해서 가변구조 제어 이론에 기초한 슬라이딩모드 제어규칙을 결정하고 유도전동기 자계 슬립주파수형 벡터제어를 실현한다.

• Proceedings of the KIEE Conference
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• 2002.11c
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• pp.218-223
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• 2002

광 디스크 드라이브에서의 서보 제어시스템에는 광 픽업에서 발생된 레이저 빔을 디스크 기록면의 데이터 트랙에 정확히 위치시키기 위한 제어 계를 갖고 있다. 광 디스크의 고배속화에 따른 외란의 주파수 대역의 증가에 따라 더욱 더 높은 샘플링 주파수로 레이저 빔의 위치 제어를 필요로 하게 되고, 여러 가지 알고리즘의 증가로 인해 DSP의 연산 부담은 증가하게 된다. 본 논문에서는 서보 제어에 필요한 알고리즘의 최적화된 하드웨어/소프트웨어 시스템을 구현하고 이를 이용한 실험 결과를 제시한다.

• Proceedings of the KIEE Conference
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• 2002.11d
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• pp.109-111
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• 2002

It requires to study on accurate control skill for the technical improvement of servo system require. It needs to study on brake that has constant-torque speed range as load. In this paper, braking torque of eddy current brake between electromagnet stator and rotating disk are analyzed. The torque-speed characteristics and proper disk construction are presented in here. From the computer simulation results, it was found that eddy current braking torque is linear or approximately constant over the desired speed range depending on the rotor material, disk construction, pole number and pole displacement of stator, these are confirmed by experimental results.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1996.11a
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• pp.658-661
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• 1996

For ultraprecision positioning, the use of the twist roller-type friction drive is proposed. In our study, it is difficult to decrease the resolution of positioning below 100 nm when we use general servo motors. Therefore we propose the feed hive with a small lead like a the cam-roller type traction drive leadscrew and modify it more accurately. By using the semi-loop control system, the positioning resolution of the drive can be 22.4 nm, where the pulse per revolution of the motor is 655360 and the the lead is 0.734 mm.