• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 A
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• pp.224-227
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• 1998

Linear motors are increasingly employed as direct actuators replacing the more conventional systems composed by a rotating motor and a mechanical device. Linear DC motor is useful in a high speed and high accuracy positioning system with a feedback controller. Because of these advantages, linear DC motors have already been used as motors of pen recorders and magnetic disk storage devices, these are moving coil type linear DC motors as these movers are light. Moving magnet type linear DC motor has advantages at long stroke motors because its mover's feeding wires for driving is not necessary. This paper is concerned with the analysis of linear DC motor that is moving magnet type with unipolar. In order to analyze the dynamic behaviour a mathematical model based on a simplified field analysis developed. A two dimensional finite element field solution is employed in order to illustrate the effect of yoke saturation and motor performance. It is deduced the relation between the limit value of the thrust of the linear DC motor and the dimension of the yokes.

• 제어로봇시스템학회논문지
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• 제1권2호
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• pp.94-98
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• 1995

This paper proposes an optimal design method for the weight and cost of a moving magnet typer linear DC motor (MM-LDM). The optimal design condition such as type and size of MM-LDM were determined by the trinary search algorithm after adjusting a standard function and its related parameters. In order to verigy results of the optimal design by the computer simulation, the designed values such as a thrust, a current, a velocity, and etc. of the fabricated MM-LDM were measured. And the measurement results are in good agreement with the designed ones.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1993년도 하계학술대회 논문집 B
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• pp.951-953
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• 1993

This study presents a design methods for linear DC motor and the designed motor is analyzed. To design the linear DC motor, magnetic circuit design is introduced and characteristics of LDM is analyzed by using the voltage equation aid dynamic equation. And the thrust characteristics are investigated using MEXWELL 2D.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부A
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• pp.85-87
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• 1998

In the industrial field, the necessity for the linear motion is increasing. Because of the motion converting mechanism there exist many losses. So the application of linear machines instead of rotating machines is increasing. As compared with a mono-polar type linear DC motor, it is possible for a multi-polar type linear BC motor to have a longer stroke and more thrust with thin shape. However, there are thrust ripple on multi-polar type one. In this paper, a design to multi-polarize of the linear DC motor is discussed. In order to make a smoother thrust on multi-polar type linear BC motor. a method is proposed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 A
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• pp.9-11
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• 1999

A brushless and slotless DC linear motor(LDM)employing a movable set of neodymium-iron-boron type of magnets has high performances in advantages of large thrust per weights and accurate position control. But the Moving Magnet LDM produces thrust ripples owing to mainly end-effects, shape and magnetization of permanent magnets and so on. This paper represents the improvements of thrust ripples using the finite elements methods and phase control topology.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제48권2호
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• pp.56-62
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• 1999

This paper is concerned with the design and the construction of a moving magnet type linear DC motor(MM type LDM) for instrumentation. A mathematical model for the design of a LDM is developed and a permeance method is used to calculate the effective flux density in the air gap. The flux distribution in the air gap is analyzed and the width of iron core should be determined in order not to saturate the iron core by caluclating maxmum flux density. The design data culculated by a permeance method are compared with the analyzed results using FEM(MAXWELL 2D). The errors between two results are corrected. The tested LDM is constructed using the corrected design data. The results of experiment for thrust characteristics are compared with simulation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 추계학술대회 논문집 학회본부
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• pp.6-9
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• 1997

The study is analyzed the thrust fon:e of moving type Linear DC Motor(MM-LDM). The MM-LDM consists of a stator (platen) and mover (forcer). One of the method for calculating tile thrust of an MM-LDM is to analyze the energy gradient which is determined by the distribution of magnet flux. However, this method is very difficult when used to calculate the thrust force of this kind of LDM. The stored energy in the MM-LDM can be obtained by measuring the self-inductance and mutual-inductance of equivalent circuit of the MM-LOM and this energy gradient gives the thrust. The calculation of thrust force included in this motor shows that the mutual inductance has large influence on the generation of thrust force.

• 조명전기설비학회논문지
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• 제16권4호
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• pp.64-72
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• 2002

산업의 발달에 따라 선형 직류 모터의 용용이 확대되고 있다. 본 연구에서는 가동차석형 양측식 다분할 여자 LDM의 해석을 연구대상으로 하였다. 본 LDM의 구조에서 가동자는 큰 추력을 얻도록 영구지석 6개를 사용하였으며, 고정자는 철심의 포화를 억제 하도록 다 분할형 권선을 성층하였다. 또한 양측 여자 권선은 지그재그형으로 성 층하여 추력의 리플을 억제하고, 정추력을 발생할 수 있도록 설계하였다. 여기에 다 분할시 영구자석대 권선 폭의 비가 중요하므로 본 연구에서는 똑비를 1 : 1, 1 : 0.84 및 1 : 0.5의 3개 부분으로 나누어 해석하였다. 해석 방법은 복잡한 수치해석의 유한요소법 보다는 퍼미언스 및 자기저항 법을 이용하여 파라며터를 계산하였다. 제작된 실험장 치를 통하여 추력을 측정한 결과는 전 변위에 대해서 정추력이 발생함을 알 수 있었다.