• Title/Summary/Keyword: Linear force motor

Search Result 524, Processing Time 0.031 seconds

Chucking Compliance Compensation by Using Linear Motor (리니어 모터를 이용한 척킹 컴플라이언스 보상)

  • Lee, Seon-Gyu;Lee, Jin-Ho
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.26 no.1
    • /
    • pp.15-22
    • /
    • 2002
  • This paper introduces a compensating system for machining error, which is resulted from chucking with separated jaws. In machining the chucked cylindrical workpiece, the deterioration of machining accuracy, such as out-of-roundness is inevitable due to the variation of the radial compliance of the chuck workpiece system which is caused by the position of jaws with respect to the direction of the applied force. To compensate the chucking compliance induced error, firstly roundness profile of workpiece due to chucking compliance after machining needs to be predicted. Then using this predicted profile, the compensated tool feed trajectory can be generated. And by synchronizing the cutting tool feed system with workpiece rotation, the chucking compliance induced error can be compensated. To satisfy the condition that the cutting tool feed system must provide high speed and high position accuracy, brushless linear DC motor is used. In this study, firstly through the force-deflection experiment in workpiece chucked lathe, the variation of radial compliance of chuck workpiece system is obtained. Secondly using the mathematical equation and cutting experiment result, the predicted profile of workpiece and its compensation tool trajectory are generated. Thirdly the configuration of compensation system using linear motor is introduced, and to improve the system performance, PID controller is designed. Finally the tracking performance of system is examined by experiment. Through the real cutting experiment, roundness is significantly improved.

The research to improve Thrust and Levitation Force characteristic of Linear Synchronous Motor for High-speed Maglev train (초고속 자기부상열차용 선형 동기 전동기의 추력 및 부상력 특성 개선을 위한 연구)

  • Hong, Hyun-Seok;Oh, Se-Young;Han, Jung-Ho;Lee, Ju
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.28 no.6
    • /
    • pp.75-84
    • /
    • 2014
  • A linear synchronous motor (Linear Synchronous Motor, under LSM) is suitable for Maglev train. This is 500km/h or more for running high-speed propulsion system of high-efficiency, high-output characteristics. Also, as high-speed running, it is needed solution to reduce output ripple component cause bad riding like noise and vibration. So this paper was designed 500km/h-class Maglev train and analyzed characteristics of the LSM base model using finite element analysis method. Further, improved model is designed to improve characteristics of thrust and levitation force by enforcing design parameters analysis and sensitivity analysis. And it was applied skew on field in order to reduce the ripple component still remaining. Skew interpretation of the two-dimensional is proposed and this is verified by carrying out three-dimensional finite element analysis comparing two values. It proved to be valid of skew of the two-dimensional analysis.

Analysis of Magnetic Flux Path and Static Thrust Force of the Double-Side Linear Pulse Motor (양측식 리니어 펄스 모터의 자로와 정특성 해석)

  • Kim, Seong-Jong;Lee, Eun-Ung;Kim, Seong-Heon;Kim, Jun-Ho
    • The Transactions of the Korean Institute of Electrical Engineers B
    • /
    • v.51 no.9
    • /
    • pp.493-498
    • /
    • 2002
  • Double-side linear pulse motor(DSLPM) has more advantages than single-side linear pulse motor because noise and vibration can be considerably decreased by countervailing the normal forces, which is generated between two stators and mover. However, DSLPM has more complicated magnetic flux path and layout of stator pole toot/mover tooth rather than single-side linear pulse motor In this paper, DSLPM is designed and fabricated by considering the air gap magnetic density, shape of tooth and slot. In order to verify the characteristics of DSLPM, the air gap magnetic flux density is analyzed by 2D FEM and the magnetic flux path is analyzed by 3D FEM. Also the static thrust forces is obtained with the analyzed results.

Effect on characteristics of thrust forte using arc type tester in linear induction motor (선형 유도 전동기의 회전형 시험기가 추력 특성에 미치는 영향)

  • Ham, Sang-Hwan;Lee, Sung-Gu;Lee, Hyung-Woo;Lee, Ju
    • Proceedings of the KSR Conference
    • /
    • 2009.05a
    • /
    • pp.1661-1666
    • /
    • 2009
  • This paper is analyzed the effect on characteristics of thrust force of linear induction motor(LIM) by arc type tester. Many kinds of tester have a rotational shape because of a finite length of railroad. Whereas effects by using rotational type tester are generally unknown. For reason of that, this paper is analyzed the effect on characteristics by rotational type tester using 2D finite element method(FEM), and then is compared a thrust force between linear type tester and rotational type tester. Analysis model is decided by numerical modeling for fitting the LIM for propulsion system of light rail, and it is changed to proper arc model. And then we analyzed the arc and the linear model. Consequently, arc type tester is not only useful experiment but also efficient simulation method, and small error is occurred between linear and arc model.

  • PDF

Dynamic Characteristics Analysis of Linear BLOC motor using Finite Element Method Coupling with External Circuit Model (외부회로가 결합된 선형 BLDC 전동기의 유한요소법을 이용한 동특성 해석)

  • Chung, Koon-Seok;Kim, Mi-Jung;Moon, Ji-Woo;Cho, Yun-Hyun
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.56 no.7
    • /
    • pp.1231-1235
    • /
    • 2007
  • This paper presents the dynamic characteristics of a linear brushless dc (BLDC) motor with permanent magnet excitation for the precision conveyor according to the load condition. Dynamic performance of the linear BLDC motor driven with 6 step inverter such as thrust force and speed is simulated by finite element method coupling with external circuit and measured for the prototype motor. The results of finite element analysis are compared to the experimental results and verify reliability.

Optimum Design of Linear Motor by Using Taguchi Method (다구찌 기법을 이용한 선형 모터의 최적 설계)

  • Seol, Jin-Soo;Lee, Woo-Young;Rim, Kyung-Hwa
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2005.11a
    • /
    • pp.192-195
    • /
    • 2005
  • Nanometer operating linear motor is difficult to control the nano-positioning because of the vibration between structures changing of mechanical friction force happened by properties of the vibration and heat caused by operating of a mover. Therefore, it is required to analysis the vibration and heat about a mover. In this paper, we will analyze the property of vibration through analyzing by using FEM a mover of linear motor developed in the non-load situation and suggest the direction of optimal design about a mover by using method of DOE, also try to find the solution to operate the linear motor stabilized through the reducing weight of mover considering the vibration.

  • PDF

Driving Algorithm for Contact-free Linear Actuator (비접촉 선형 구동기를 위한 구동 알고리즘)

  • 이상헌;백윤수
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2003.06a
    • /
    • pp.1034-1037
    • /
    • 2003
  • Recently in the field of precision positioning device, the contact-free actuators are gaining focuses with their outstanding performances by eliminating mechanical frictions. Th is paper is about the driving algorithm for contact-free linear actuator. The proposed driving algorithm has similar structure of drives of switched reluctance motor and reduces the normal forces and force ripple. The simulation and experiment are executed to verify the proposed method.

  • PDF

Development of a Aerostatic Guideway Driven by the Linear Motor (리니어모터를 이용한 초정밀 공기정압안내면 개발)

  • 박종하;황주호;박천홍;홍준희
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 2003.10a
    • /
    • pp.36-40
    • /
    • 2003
  • In order to discuss the availability of aerostatic guideways 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 156N and a laser scale with the resolution of $0.01\mu\textrm{m}$ 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 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 $0.01\mu\textrm{m}$ resolution step command. The velocity variation of feeding system is less than 0.6%. From these results, it is confirmed that the aerostatic guideway driven by the coreless linear motion is very useful for the ultra precision machine tools.

  • PDF

Magnetic and Thermal Analysis of a Water-cooled Permanent Magnet Linear Synchronous Motor

  • Zhang, Xinmin;Lu, Qinfen;Cheng, Chuanying;Ye, Yunyue
    • Journal of international Conference on Electrical Machines and Systems
    • /
    • v.1 no.4
    • /
    • pp.498-504
    • /
    • 2012
  • The water-cooled Permanent Magnet Linear Synchronous Motor (PMLSM) has a wide range of applications due to high efficiency, high thrust force density and high acceleration. In order to ensure normal operation and maximum output, both the magnetic and thermal performance are vital to be considered. Based on ANSYS software, electromagnetic and thermal finite-element analysis (FEA) models of a 14-pole, 12-slot water-cooled PMLSM are erected adopting suitable assumptions. Firstly, the thrust force and force ripple with different current densities are calculated. Secondly, the influence of different water flow on the motor heat dissipation and force performance under different operationional conditions are investigated and optimized. Furthermore, for continuous operation, the temperature rise and thrust feature are studied under the rated load 8A, the proper temperature $120^{\circ}C$ and the limited temperature $155^{\circ}C$. Likewise, for short-time operation, the maximum duration is calculated when applied with a certain large current. Similarly, for intermittent operation, load time as well as standstill time are determined with the optimal current to achieve better thrust performance.