• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 추계학술대회 논문집
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• pp.1002-1005
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• 2000

The goal of this study is to develop a linear DC motor with high thrust, speed and stiffness for machine tool. In the first phase of this study, We has made a pilot model and measuring system. Using the measuring system, We could finished the performance test of the pilot model, which continuous thrust is 1, 391N. Experimental values agree with the theoretical results well. In a certain sense, We are expecting the realization of linear motor with continuous thrust of 6, 000 to 7, 000N next time.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1992년도 하계학술대회 논문집 B
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• pp.623-625
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• 1992

This study presents a design method for linear DC motor which substituted for rotary combined with conversion apparatus and the designed motor is analyzed. To design the linear DC motor, magnetic cicuit network method is introduced and characteristics of motor at steady state are analyzed using FEM. And the transient behavior is investigated by using the finite element analysis coupling voltage equation and dynamic equation.

• 수산해양기술연구
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• 제26권1호
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• pp.76-80
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• 1990

비선형의 특성을 갖고 있는 DC 서보 모터의 속도 제어에 퍼지 제어기의 사용을 제안하였다. 퍼지 제어기는 퍼지 모델로부터 설계되며, 그 퍼지 모델은 시스템의 입출력 데이터로 인식되고 비선형 시스템의 표현에 뛰어난 능력을 갖고 있다. 따라서 퍼지 모델로부터 설계되는 퍼지 제어기는 시스템의 비선형 특성이 잘 반영되어지며 그러한 점은 서보 모터의 속도 제어에 응용한 결과 잘 알 수 있었다. 즉 퍼지 제어기에 비해 고속 제어가 가능해졌으며 정상 리플(ripple)이 감소하였다. 또한 이 퍼지 제어기에서 사용되는 퍼지 집합의 멤버쉽 함수는 간단한 선형 구분 함수이므로 퍼지 제어기도 간략한 형태로 표현되었다

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 춘계학술대회 논문집
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• pp.73-77
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• 2002

The requirements for higher productivity call for high speed of the machine tool axes. Iron core type linear DC motor is growly accepted far a viable candidate of the high speed machine tool feed unit. LDM, however, has inherent disturbance force components: cogging and force ripple. These disturbance force directly affects tracking accuracy of the carrage and must be eliminated or reduced. Reducing motor ripple, this paper adapted the feed forward compensation method and neural network control. Experiments carried 7ut on the linear motor test setup show that this control methods is usable in order to reduce the motor ripple.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2001년도 춘계학술대회 논문집
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• pp.71-73
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• 2001

The requirements for higher productivity call for high speed of the machine tool axes. Iron core type linear DC motor is growly accepted for a viable candidate of the high speed machine tool feed unit. LDM, however, has inherent disturbance force components: cogging and force ripple. These disturbance force directly affects the carrage tracking accuracy and must be eliminated or reduced. Reducing motor ripple, this paper adapted the feed forward compensation method. Experiments carried out on the linear motor test setup show that this compensation method is usable in order to reduce the motor ripple.

• 전기학회논문지
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• 제57권4호
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• pp.603-609
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• 2008

Slotless linear brushless DC motor are widely used in precision machine applications because of their advantages such as low of detent force, negligible iron loss. But they have a disadvantage such as low thrust density, thrust ripple, and excessive use of permanent magnet materials. These lead to undesirable performance and high production cost. In this paper, we deal with the design and characteristics investigation of a air-core tubular linear brushless DC(TLBLDC) motor with air-core stator and permanent magnet mover. And to investigate the static and dynamic characteristics of air-core TLBLDC motor, the prototype machine is manufactured and analyzed by F.E.M. and Matlab simulink simulations. Especially, dynamic characteristics of air-core TLBLDC motor driven with 6 step inverter are simulated by F.E.M.coupling with external circuit and Matlab simulink program, and measured for the prototype motor. The simulation results are compared to the experimental results such as current waves, thrust and speed curve.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.19-21
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• 2006

This paper presents the control method that inverter output keeps to linear to reference voltage of Synchronous Reluctance Motor using DC Link voltage Synthesis. The Inverter output voltage cannot be displayed to linear about inverter reference voltage if Real DC Link voltage is different from DC Link voltage of PWM amplitude. Also, the overmodulation that there is linearity broken if reference voltage is out of range that inverter can output voltage. Torque ripple generates the vibration and noise of a motor. This paper proposes the control method so that torque ripple decreases and the linearity of inverter output keeps using the DC Link voltage Synthesis.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2004년도 추계학술대회 논문집
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• pp.358-362
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• 2004

Higher productivity requires high-speed motion of machine tool axes. The iron core linear DC motor (LDM) is widely accepted as a viable candidate for high-speed machine tool feed unit. LDM, however, has two inherent disturbance force components, namely cogging and thrust force ripple. These disturbance forces directly affect the tracking accuracy of the feeding system and must be eliminated or reduced. In order to reduce motor ripple, this research adapted the feedforward compensation method and neural network control. Experiments carried out with the linear motor test setup show that these control methods are effective in reducing motor ripple.

• 제어로봇시스템학회논문지
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• 제14권4호
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• pp.385-391
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• 2008

To effectively cope with a complexity of kinematic metrology due to workspace enlargement of the planar stage, the linear induction motor is suggested as its new driving source. Especially, the linear induction motor under uniform plate type of secondary doesn't inherently have a periodical force ripple which is generally shown in the brushless DC motor. But, it presents a poor transient characteristic at zero or low speed zone owing to time delay of flux settling, resulting in slow response. To improve the servo property of linear induction motor and apply successfully it to the precision stage, this paper discusses a modified vector control methodology. The controller has a novel input form, fixed d-axis current, q-axis current and forward-fed DC current, to control thrust force and normal force of the linear induction motor independently. Influence of the newly introduced input and the feasibility of controller are validated experimentally.

• 대한전자공학회논문지
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• 제22권3호
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• pp.31-42
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• 1985

DC motor를 제어하기 위하여, 두개의 feedback sensor 즉, potenfiometer와 tachometer를 사용하고 있다. 최적 제어치를 얻기위한 제어 방법으로써 선형계로써는 kalman regular type, 비 선형계로써는 on-off relay-type와 상태 제환을 적용하였다. 역시, 추적각의 측정 방법으로서는. 측정치를 이웅한 위치와 속도 미분치를 이용한 위치와 속도, 그리고 관측기를 이용한 위치, 속도와 오제곱 분산치를 추정하여 추적각의 제어치를 비교 분석하였다.