• Title/Summary/Keyword: Linear force motor

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Structural Design of a Mover considering the Thermal Analysis of a Stator Module (스테이터 모듈의 열해석을 고려한 이동체의 구조설계)

  • Lee, Jeong-Myeong;Han, Dong-Seop;Lee, Seong-Uk;Han, Geun-Jo;Lee, Gwon-Sun
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • v.1
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    • pp.367-372
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    • 2006
  • When we design a linear motor, the thermal behavior investigation is one of great important considerations with respect to uniform thrust force and thermal deformation of a linear motor. In this study, we conduct the research for the structural design of the linear motor for LMTT(Linear Motor-based Transfer Technology) which is the next generation of container horizontal transfer system in order to automate a container terminal. After the dimensions of main parts for a linear motor were set up, we carried out the thermal-structural analysis of the linear motor considering the thermal analysis of the stator module.

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The Characteristics of High-speed Noncircular Machining Tool Feed Systme using Linear Motor (리니어 모터를 이용한 고속비진원 가공용 공구이송장치의 특성연구)

  • 서준호;민승환;김성식;이선규
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.985-990
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    • 1995
  • Recently, the development of high speed and high precision NC-lathe for piston head machining is needed for the complexity and diversity of the piston head shape used in automobile reciprocating engine. THe piston head has many complex shapes in the aspect of fuel economy, such as ovality, profile, double ovality and recess. Among them, for the maching of the over shape of 0.1~1mm the cutting tool should move periodically symchronized with the rotation of piston workpiece. The cutting tool feeed system must have high positioning accuracy for the precise machining, high speed for the fast maching and high dynamic stiffness for the cutting force. The linear brushless DC motor is used for satisfying these coditions. The ballbush guide and supporting guide using turcite is used for the guidance of the feed drive system. Linear encoder, digital servo ampllifer and controller are used for driving the motor. THis paper presents the design and simulation of the new tool feed system for noncircular machining.

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Development of Iron Core Type Linear Motor for Machine Tool (공작기계용 철심형 리피어모터 기술 개발)

  • Joung, Jae-Han;Park, Jae-Wan;Lee, Sang-Ryong
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.9
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    • pp.82-89
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    • 2002
  • There is an intensifying demand fur linear motors in vast range of industry applications such as in factory automation and semi-conductor manufacturing equipment due to their high positioning accuracy, high static stiffness, high thrust and excellent dynamic characteristics. This paper presents an iron core type linear motor for machine tool whose rated thrust is up to 6000N. For electromagnetic field and dynamic analysis, finite element method (FEM) is implemented to predict motor performance. Various design parameters are considered to reduce thrust ripple and to improve dynamic performance with the least sacrifice of effective thrust. Experimental results on thrust and static stiffness are also followed to confirmed the validity of the analysis.

Optimal Construction of Rotary-Linear Induction Motor (회전-리니어 병용 유도전동기의 특성해석)

  • Onuki, Takashi;Jeon, Woo-Jin;Tanabiki, Masamoto;Yoo, Ji-Yoon
    • Proceedings of the KIEE Conference
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    • 1997.07a
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    • pp.130-132
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    • 1997
  • In this paper, we propose a new type of tubular linear induction motor(TLIM) with two-dimensional motion. The proposed motor consists of four short primary LIMs arranged on a same circumference and a common secondary. By adopting independently energized ring-windings to the primary, we can expect the reduction of coil-end region and the freedom of alternating current supply. The secondary conductor is capable of producing anyone of rotary, linear, and helical motions by controlling the phase of supply currents in each primary winding. From the 3-D finite element analysis and the experiment, we derive the feeding conditions to increase the subsidiary rotary-force and an optimal arrangement of primary currents to reduce the number of slot.

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Design of Linear XY Stage using Planar Configuration and Linear Motors with Halbach Magnet Array (평면형 구조와 Halbach 자석배열 선형모터를 이용한 리니어 XY 스테이지의 설계)

  • Kim, Ki-Hyun;Lee, Moon-G.
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.19 no.4
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    • pp.553-561
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    • 2010
  • In flat panel display or semiconductor industries, they install the equipments with fine line width and high throughput for fabrication and inspection. The equipments are required to have the linear stage which can position the work-piece with high speed, fine resolution on wide range of motion. In this paper, a precision planar linear XY stage is proposed. The stage has a symmetric planar window configuration and is guided by air-bearings on granite plate. The symmetric planar window configuration makes the stage has robustness against dynamic and thermal disturbances. The air-bearings let the stage move smooth on straight guide bar and flat granite surface. The stage is actuated by linear motor with Halbach magnet array (HMA). HMA generates more confined magnetic flux than conventional array. The linear motors are optimized by using sequential quadratic programming (SQP) with the several constraints that are thermal dissipation, required power, force ripple and so on. The planar linear XY stage with the symmetric planar configuration and the linear motors is implemented and then the performance such as force ripple, resolution and stroke are evaluated.

A Design of Optimal Interval between Armatures in Long Distance Transportation PMLSM for End Cogging Force Reduction

  • Park, Eui-Jong;Jung, Sang-Yong;Kim, Yong-Jae
    • Journal of Electrical Engineering and Technology
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    • v.11 no.2
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    • pp.361-366
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    • 2016
  • Although the permanent magnet linear synchronous motor is a motor useful for transportation systems thanks to its high speed, high acceleration and deceleration, the linear motor generally has armatures installed on the full length of the transport path. It results in the increase in material costs and manufacturing time. As a means to solve this problem a stationary discontinuous armature system is suggested. However, it involves the following two issues. The first issue is it is impossible to control the mover in the section where any armature is not installed as armatures are distributed. The second one is increasing cogging force due to the ends of the armatures. Therefore, this study aims to solve these problems by adjusting intervals between armatures to control the mover anywhere, and to design the interval between armatures optimally to minimize the end cogging force. The suitable distance was deduced. It addressed the problems and showed suitability for long distance transportation PMLSM.

Transverse Flux Linear Machine with High Thrust for Direct Drive Applications

  • Chang, Jung-Hwan;Kim, Ji-Won;Kang, Do-Hyun;Bang, Deok-Je
    • Journal of Magnetics
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    • v.15 no.2
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    • pp.64-69
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    • 2010
  • This paper describes the development of a novel transverse flux linear motor (TFLM) excited by permanent magnets (PMs). It combines the advantage of two different TFLMs and produces high thrust with reduced normal force. The magnetic field is analyzed by combining the three-dimensional (3D) equivalent magnetic circuit network (EMCN) method with 2D finite element analysis. The experimental findings of the prototype motors are in good agreements with the analysis results, and demonstrate the potential of the proposed motor as a direct drive requiring relatively long displacement of a mover.

Design of a Transverse Flux Linear Motor

  • Chang, Jung-Hwan;Kim, Ji-Won;Kang, Do-Hyun
    • Journal of Magnetics
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    • v.16 no.1
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    • pp.58-63
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    • 2011
  • This paper presents design procedures of a transverse flux linear motor (TFLM). The minimum and maximum flux linkage was determined by the simplified equivalent magnetic circuit and estimated average magnetic flux density at the air gap region by considering the shape of applied magnetomotive force (MMF). With this information, the number of turns of each phase winding was calculated based on the amplitude of applied voltage and speed of a mover. The rated current, coil diameter, and winding area were obtained with the aid of an empirical formula for determining the required MMF. The usefulness of the proposed design method for TFLM is verified by the three-dimensional equivalent magnetic circuit network (EMCN) method and the experimental results of prototyped machine.

Radial Force Control of a Novel Hybrid Pole BLSRM

  • Wang, Hui-Jun;Lee, Dong-Hee;Ahn, Jin-Woo
    • Journal of Power Electronics
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    • v.9 no.6
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    • pp.845-853
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    • 2009
  • This paper presents a novel hybrid pole BLSRM (Bearingless Switched Reluctance Motor) and its radial force control scheme. The proposed hybrid pole BLSRM has separated radial force poles and rotating torque poles. According to the FEM analysis, the proposed BLSRM has an excellent linear characteristic of radial force and controllability that is independent from the torque current. The radial force can be produced by the radial force winding which is wound at the separated radial force poles. The rotating torque is produced by the excitation current of the torque windings which are wound at the torque pole. The proposed radial force control scheme is independent of the phase torque winding current. A simple PID controller and look-up table are used to maintain a constant rotor air-gap. The proposed BLSRM and its radial force control scheme are verified by FEM analysis and experimental tests.

Development of a Hydrostatic Guideway Driven by the Linear Motor (리니어모터를 이용한 초정밀 유정압안내면 개발)

  • 박천홍;황주호;오윤진;이찬홍
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.343-346
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    • 2003
  • In order to discuss the availability of the hydrostatic guideway driven by the coreless linear motor to ultra precision machine tools, a prototype of guideway is designed and tested in this research. A coreless linear DC motor with the continuous force of 156 N and a laser scale with the resulution of 10 nm are used as the feeding system. The experiments are performed on the static stiffness. motion accuracy, positioning accuracy. microstep response and variation of velocity. The guideway has the infinite axial stiffness within 50 N of applied load, and has 0.08 ${\mu}{\textrm}{m}$ of linear motion error and 0.1 arcsec of angular motion error. It also has 0.21 ${\mu}{\textrm}{m}$ of positioning error and 0.09 ${\mu}{\textrm}{m}$ of repeatability, and it shows the stable response against the 10 nm resolution step command. The velocity variation of feeding system is less than 5%. From these results, it is confirmed that the hydrostatic guideway driven by the coreless linear motor is very useful for the ultra precision machine tools.

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