• Title, Summary, Keyword: Linear motor

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Large Thrust Linear Motor for Low-duty-cycle Operation (고추력 저가동률 리니어모터에 관한 연구)

  • Bang, Yeong-Bong;Lee, Gyeong-Min
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.8
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    • pp.161-171
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    • 2002
  • This paper presents a linear motor, which generates large thrust with a low operating rate. In industrial fields there is a need for actuators that work with a low duty cycle but generate large thrusts. An example of such a case is provided by the actuators for ejector mechanisms in electric injection molding machines. The ordinary LSM (linear synchronous motor) is unsuitable for this large-thrust and low-operating-rate usage, because of its large size and high cost. This paper contains experimental results on linear motors that can generate large thrusts for a short time, and which can be cheaply produced. The described linear motor could be contained space of $250mm \times250mm\times 250mm$ and generate a maximum thrust of about 20000 N at a current of 250 A.

Force Characteristic Analysis of Linear Switched Reluctance Motor using Dynamic Simulation (동특성 시뮬레이션을 이용한 리니어 스위치드 릴럭턴스 전동기의 힘 특성 해석)

  • Jang, Seok-Myeong;Park, Ji-Hoon;Park, Yu-Seop;Kim, Jin-Soon;Choi, Ji-Hwan
    • Proceedings of the KIEE Conference
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    • pp.58-60
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    • 2009
  • This paper deals with force characteristic analysis of linear switched reluctance motor using dynamic simulation. First, we calculated flux density of linear switched reluctance motor according to position. Second, analyzed normal force from flux density of linear switched reluctance motor according to position. Also, analysis result compares with data that is derived through a finite element analysis, and proved validity. However, linear switched reluctance motor has non linear characteristic, hence, analysis of propulsion force do not easy using analytical method. Therefore, we presented dynamic characteristic analysis model which is consisted at motor and sensor signal part, etc., and substitute circuit constant that get using magnetic equivalent circuit method, we confirmed propulsion force.

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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.

Efficiency Improvement of Linear Ultrasonic Motor Using Arrangement for Magnification of Displacement (변위확대기구를 이용한 선형 초음파 전동기의 효율 개선)

  • 이명훈;우상호;김진수
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.177-180
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    • 2000
  • In this paper, we studied efficiency improvement of linear ultrasonic motor using projection. The principle of ultrasonic motor is to use an elliptic motion generated at the side of the vibrator, and the elliptic motion of the ultrasonic motor was obtained by complex oscillation of L$_1$-B$_4$ mode. As the experimental results, the efficiency of linear ultrasonic motor without projection was 1.52[%] when applied voltage was 56[V] in resonance frequency 58.4[kHz]. The efficiency of linear ultrasonic motor using projection was 3.36[%] when applied voltage was 56[V] in resonance frequency 58.4[kHz]. The efficiency was improved by projection.

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The Simulation of Constant Speed Control Characteristics for Linear Induction Motor using Matlab Simulink (Matlab Simulink를 이용한 선형 유도전동기의 속도제어특성)

  • Kim Seong Kyeol;Na Jong Duk;Cho Geum Bae;Baek Hyung Lae
    • Proceedings of the KIEE Conference
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    • pp.1223-1225
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    • 2004
  • In difference with the rotary type electrical machinery, the linear induction motor(LIM) that generates the direct thrust directly, is widely used for the operation system of electrified railroad, elevation system, conveyer system, and so on. The operational principle of linear induction motor is constructively similar to the general rotary induction motor. It is difficult to realize the complicate linear induction motor which is applied SVPWM system, but widely used in vector motor control system or servo control system because of its high performance in current control. In this paper, we presented the dynamic characteristic analyzing methode, and calculated efficiently the end effect by using equivalent circuit methode in the operating linear induction motor control system for Maltlab simulink modeling.

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A Primary Permanent-Magnet Linear Motor for Urban Rail Transit

  • Cao, Ruiwu;Cheng, Ming;Mi, Chris;Hua, Wei;Zhao, Wenxiang
    • Journal of international Conference on Electrical Machines and Systems
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    • v.1 no.1
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    • pp.54-60
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    • 2012
  • In this paper, a new permanent-magnet (PM) linear motor is proposed, in which both the magnets and armature windings are placed in the short mover, while the long stator consists of iron core only. Hence, this new PM linear motor can be called a primary permanent-magnet linear motor. It exhibits the advantages of robustness, low cost, high efficiency, high power factor, and high thrust force density. It is especially suitable for long stator applications such as urban rail transit. In this paper, the topology and operation principle of this motor are discussed in detail. The steady-state characteristics including field distributions, flux-linkage, back-EMF, phase inductance and thrust force are investigated. In addition, the technique of skewing stator teeth is adopted to improve the electromagnetic performance. Results from finite element method (FEM) verified the theoretical analysis results.

Optimization of the Thermal Behavior of Linear Motors with High Speed and Force ($2^{nd}$ Paper) (고속.대추력 리니어모터의 열특성 최적화 [2])

  • Eun, In-Ung
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.7
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    • pp.163-170
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    • 2002
  • This paper presents some measures far the optimization of the thermal behavior of linear motors, which are used as a high speed feed mechanism in machine tools. Thermo-Sandwich-Construction using two cooling circuits and an insulation layer shows an effective cooling system for linear motors. Conducting sheet can be also used to reduce heat flow from linear motor to machine table. Cooling pipe is a simple and effective cooling system for the secondary part of synchronous linear motor. Through the combination of the Thermo-Sandwich-Construction, conducting sheet and cooling pipe the thermally optimized linear motor shows a well improved thermal behavior in comparison with the prototype motor.

A Study on the Multipolarization of a Moving Magnet Type Linear DC Motor (가동 자석형 선형 직류 전동기의 다극화에 관한 연구)

  • Jung, H.J.;Kim, Y.;Baek, S.H.;Kim, P.S.
    • Proceedings of the KIEE Conference
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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.

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Study on a Linear Motor Dynamometer for Positioning Performance Test (Linear Motor 위치 제어 성능 시험을 위한 장치 연구)

  • Roh C.Y.;Kim J.K;Roh M.H.;Lee E.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.305-308
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    • 2005
  • Linear motor has been developed for linear motion of machine tools. Linear motor is useful to design the linear motion, high speed and high accuracy, because of the simple system not required the additional mechanical part such as coupling and ballscrew. This paper tested performance of linear motor such as velocity response, position tracing performance, subordinate Traction force change and positional accuracy.

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