• Title/Summary/Keyword: Linear motor

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Analysis for the Thermal Behavior of Synchronous Linear Motor by EEM (FEM을 이용한 동기식 리니어모터 열특성의 해석)

  • Eun, In-Ung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.8
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    • pp.1461-1471
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    • 2002
  • Linear motor has a lot of advantages in comparison with conventional feed mechanisms: high velocity, high acceleration, good positioning accuracy and a long lifetime. An important disadvantage of linear motor is its high power loss and heating up of motor and neighboring machine components in operation. For the application of the linear motors to precision machine tools an effective cooling method and thermal optimizing measures are required. In this paper Finite-Element-Method for the thermal behavior of synchronous linear motor is introduced, which is useful for the design and manufacturing of linear motors. By modeling the linear motor the orthotropic physical properties of the sheet metal and windings were considered and convective coefficient in the water cooler and to the surroundings was defined by analytical and experimental method. The calculated isothermal lines could analyze the heat flow in the linear motor.

A Study on Heat and Vibration of Nano Precision Linear Motors (나노 구동용 선형 모터의 열.진동에 관한 연구)

  • Kim H.Y.;LEE W.Y.;Rim K.H.;Seol J.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.254-259
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    • 2005
  • The heat and vibration effect is known to cause a serious deformation in linear motor system. The paper presents a heat and vibration characteristics that compare a advanced linear motor with developed linear motor through experiment and analyses. The heat in linear motor system is identified for experimental data and analytic data using the Finite Volume Method (FVM). Also, it shows that the optimum standard analyzed the acceleration patterns of the moving part cause the vibration source in linear motor. It presents the analyzed dynamics of linear motor in compliance with a deformation of the non-linear factor.

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Lambda shape multiway moving ultrasonic linear motor (람다형 다방향 초음파 선형 모터)

  • Do, Young-Soo;Nam, Hyo-Duk;Kim, Young-Duk
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.06a
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    • pp.263-265
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    • 2007
  • An ultrasonic linear motor using lambda shape vibrators has been designed and fabricated. The multiway ultrasonic motors mainly consist of an lambda shape ultrasonic vibrator which generates elliptical motions in beat. The lambda shape ultrasonic linear motor use longitudinal and bending vibration mode. In order to high precision motion control and multiway moving, piezoceramics were adhered to lambda shape brass elastic material. The finite element method was used to optimize dimension of ultrasonic vibrator and direction of vibratory displacement. As a result of estimating the characteristics of the ultrasonic linear motor, The results have shown that the lambda shape ultrasonic linear motor can be moved multiwav by using the phase control. Close agreement between the FEM results and experimental results obtained for the lambda shape ultrasonic linear motor.

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The Finite Element Analysis and the Optimum Geometric Design of Linear Motor

  • Lee Tae-Won
    • International Journal of Precision Engineering and Manufacturing
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    • v.6 no.4
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    • pp.73-77
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    • 2005
  • Linear motor has been considered to be the most suitable electric machine for linear control with high speed and high precision. Thrust of linear motor is one of the important factors to specify motor performance. Maximum thrust can be obtained by increasing the magnitude of current in conductor and is relative to the sizes of conductor and magnet. However, the magnitude of current and the size of conductor have an effect on temperature of linear motor. Therefore, it is practically important to find optimum design that can effectively maximize thrust of linear motor within limited range of temperature. Finite element analysis was applied to calculate thrust and numerical solutions were compared with experiments. The temperature of the conductor was calculated from the experimentally determined thermal resistance. The ADPL of ANSYS was used for the optimum design process, which is commercial finite element analysis software. Design variables and constraints were chosen based on manufacturing feasibility and existing products. As a result, it is shown that temperature of linear motor plays an important role in determining optimum design.

Dynamic Response of Linear Actuator with the Thrust Force of Transverse Flux Linear Motor (횡자속 선형전동기의 추력특성에 따른 선형액추에이터의 동특성)

  • Woo Byung-Chul;Kang Do-Hyun;Hong Do-Kwan
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.1
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    • pp.16-20
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    • 2006
  • The proposed paper presents an integrated linear actuator which combines Transverse Flux Linear Motor(TFLM) for Household elelctric applications. They both use the same primary magnetic circuit, but they have different secondary movers. The paper presents a new design of linear motor for a new electromagnetic linear actuator, an tintegrated TFLM. The calculated tthrust force is good agreement with experiments. We have studied a transient response of a linear actuator with a damping ratio, spring constant and specially a pressed power patterns for a constant stroke control.

A study on thermal characteristics of linear motor for high speed machining tools (공작기계 고속이송용 리니어 모터의 열 특성에 관한 연구)

  • 정일용;강은구;이석우;최헌종
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.98-101
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    • 2001
  • Linear motor feature a direct connection to the machine tool, therefore a direct route for heat transfer. The heat dissipation of linear motor machine is affected by the maximum temperature rise of the primary part, coil and the cooling method. To minimize temperature induced dimension changes and decrements of performance, linear motor machine require effective cooling mechanism. To evaluate cooling performance of existing linear motor machine, some experiments about temperature profile are performed using thermocouple recorder. Due to the lack of information about internal structure, only some finite element modeling is prepared and analyzed.

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A study on thermal and driving characteristics of linear motor for high speed machining tools (공작기계 고속이송용 리니어 모터의 열특성 및 운동특성에 관한 연구)

  • 최헌종;정일용;강은구;이석우
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.414-419
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    • 1997
  • Linear motor feature a direct connection to the machine tool, therefore a direct route for heat transfer. The heat dissipation of linear motor machine is affected by the maximum temperature rise of the primary part, coil and the cooling method. To minimize temperature induced dimension changes and decrements of performance, linear motor machine require effective cooling mechanism. 1'0 evaluate cooling performance of existing linear motor machine, some experiments about temperature profile are performed and evaluated using thermocouple recorder. Due to the lack of information about internal structure. only some finite element modelling is prepared and analyzed.

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Development of a Miniature Air-bearing Stage with a Moving-magnet Linear Motor

  • Ro, Seung-Kook;Park, Jong-Kweon
    • International Journal of Precision Engineering and Manufacturing
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    • v.9 no.1
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    • pp.19-24
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    • 2008
  • We propose a new miniature air-bearing stage with a moving-magnet slotless linear motor. This stage was developed to achieve the precise positioning required for submicron-level machining and miniaturization by introducing air bearings and a linear motor sufficient for mesoscale precision machine tools. The linear motor contained two permanent magnets and was designed to generate a preload force for the vertical air bearings and a thrust force for the stage movement. The characteristics of the air bearings, which used porous pads, were analyzed with numerical methods, and a magnetic circuit model was derived for the linear motor to calculate the required preload and thrust forces. A prototype of a single-axis miniature stage with dimensions of $120\;(W)\;{\times}\;120\;(L)\;{\times}\;50\;(H)\;mm$ was designed and fabricated, and its performance was examined, including its vertical stiffness, load capacity, thrust force, and positioning resolution.

Research for ultra precision linear motor by using piezo stack actuators (적층형 압전재료를 이용한 초정밀 선형 모터에 관한 연구)

  • 임장환;김재환
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.11a
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    • pp.649-654
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    • 2003
  • This paper is focused on the research of the ultra precision linear motor by using piezo stack actuators. The development of linear motor which can be controlled nano or micro scale is necessary for the precision manufacturing. Self-moving-cell principle is used for the design of linear motor Self-moving-cell linear motor is consisted of three cell structures, and each cell has two shells and one piezo-stack actuator. Each cell can do clamping and moving by two shell structures. The shell structure deformation by piezo stack actuator can move the linear motor by losing the clamping between the shall and guideway. This paper presents the design, manufacturing and test of the motor.

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A PM-type Linear Motor Capable of Self Magnetic Levitation (자체 자기부상이 가능한 영구자석형 리니어 모터)

  • Kim, Woo-Yeon;Kim, Seung-Jong;Lee, Jong-Min;Chung, Sung-Chong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.32 no.10
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    • pp.850-855
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    • 2008
  • This paper suggests a new linear motor which is able to levitate as well as move its mover without any linear bearing or even additive windings. Its structure is very similar to a well-known both-sided linear motor which consists of two stators and a common mover. And the movement principle is the same with that of conventional linear motor. But unlike the conventional one, the amplitudes of phase currents are controlled to levitate the mover. In this paper, the structure and principle of the suggested bearingless linear motor are introduced in detail and its feasibility is experimentally investigated. Using the prototype and a very simple controller, we succeeded in the levitation and linear movement of the mover at a time.