• The Transactions of the Korean Institute of Power Electronics
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• v.9 no.2
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• pp.142-149
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• 2004

PMLSM(Permanent Magnet linear Synchronous Motor) has widely applied to industrial automations, machine tools and semiconductor equipments due to the merit on the reduction of noise, vibration and the superior dynamic characteristics in comparison to the conventional method, which uses mechanical transfer equipments. Especially, in the case of applying to Z-axis operation structure, control system needs the method of an initial angle setting and the improvement of up/down operation characteristics. This paper proposes an initial angle setting algorithm and a variable gain schedule using real speed and moving direction to improve up/down operation characteristics. The effectiveness of proposed algorithms Is demonstrated by comparing to a conventional gain system via 4-point absolute positions profile with each velocity, acceleration and deceleration.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.5
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• pp.68-73
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• 2005

This paper presents the characteristics analysis of an electromagnetic pump using the linear induction motor(LIM). The electromagnetic pump can be used to transfer the molten metals by the electromagnetic force of LIM. The characteristics of the pump are analyzed solving a hydrodynamic equation with an electromagnetic one.

• The Transactions of the Korean Institute of Power Electronics
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• v.4 no.4
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• pp.318-324
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• 1999

In this paper. a control method based on finite element analysis is presented to improve the control characteristics of t the permanent magnet linear synchronous motor (PMLSM). In the control method. additional compensation current is a added to the conventional control current according to the position of mover. The characteristics of thrust ripple a according to the position of mover and the current are analyzed by using finite element method (FEM). And. the value of current to compensate the thrust ripple due to the cog밍ng force is calculated from the analysis results. The c characteristics according to control method are compared in case of speed control. and to conform the validity of the p presented method, a test set is built and experiments are performed.

• Journal of the Korean Society for Railway
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• v.11 no.4
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• pp.398-403
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• 2008

The propulsion for locomotive application has changed from the DC motor system to the induction motor system. Although the induction motor system has almost reached the stage of maturity, this system also needs to be changed to the PM motor system for the direct drive without using reduction gear. Thus, the IPMSM (Interior buried Permanent Magnet Synchronous Motor) has been adopted to meet the locomotive driving specification. Where the wheel is directly dirven by the traction motor. In this paper, the investigation on IPMSM satisfying driving specifications for the direct drive has been performed using the advanced FEM.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.106-107
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• 2013

고속 자기부상열차의 추진전동기로 사용되는 선형동기전동기의 구동 알고리즘으로는 추력의 제어를 위해 벡터제어를 사용한다. 벡터제어를 위해서는 위치 정보가 필요하기 때문에 바코드 등의 센서를 이용한다. 바코드에 의한 위치정보시스템은 정보가 이산형이고 통신을 이용하기 때문에 실제 위치 정보를 취득하는데 지연이 발생하여 벡터제어에 영향을 주게 된다. 본 논문에서는 바코드 정보취득시스템의 ldus에 의한 영향을 분석하고 이에 대한 보상알고리즘을 제안하였다. 시물레이션을 통해 문제점을 분석하고 제안한 알고리즘의 타당성을 검증하였다.

• The Journal of the Korea institute of electronic communication sciences
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• v.7 no.5
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• pp.1067-1072
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• 2012

Recently, linear motors have been widely researched and have been increasingly used in various industrial applications. Especially, permanent magnet linear synchronous motors(PMLSMs) have been getting the spotlight in the transportation system. A PMLSM is structurally simple and has a lot of merits such as high speed, high thrust force, etc. However, in case of a long stator system which arranges armature to the full length of transportation lines, a PMLSM has some disadvantages such as the material cost increase and long manufacturing time. Hence, in order to overcome these problems, the PMLSM with stationary discontinuous armature structure and concentrated windings was proposed. However, this method occurs undesirable cogging force by outlet edge effect. The cogging force causes thrust force ripples and generates noise and vibration. Therefore, in this paper, we proposed installation method of auxiliary pole PMLSM with concentrated winding applying bifurcating in order to reduce cogging force by the outlet edge when the armature is placed in a discontinuous arrangement. Also, we have examined characteristics of outlet edge cogging force using 2-D finite element analysis(FEA).

• The Transactions of the Korean Institute of Power Electronics
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• v.11 no.2
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• pp.159-163
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• 2006

In order to tune the speed controller in the linear servo applications an accurate information of a mover mass including a load mass is always required. This paper suggests the mass estimation method of a permanent magnet linear synchronous motor(PMLSM) 4y using the parameter estimation method of Least-Squares algorithm. First, the deterministic autoregressive moving average(DARMA) model of the mechanical dynamic system is derived. Then the application of the Least-Squares algorithm shows that the mass can be accurately estimated both in the simulation results and in the experimental results.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.812_813
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• 2009

본 논문에서 로프리스 엘리베이터용 영구자석형(PM) 선형동기전동기(LSM)의 디텐트력을 저감하기 위하여 반응표면법(RSM)을 이용한 디텐트력의 최소화 설계 방법을 제안하였다. RSM을 이용하여 정수 슬롯형과 분수 슬롯형 PM-LSM의 설계변수를 추론하고 유한요소법(FEM)으로 디텐트력을 구하였다. 반응표면법과 유한요소법의 해석결과를 토대로 분수 슬롯형 PM-LSM이 주어진 체적의 엘리베이터 시스템에 적합한 형상임을 입증한다.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.778-779
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• 2008

본 논문에서는 보극을 이용한 영구자석형 선형동기전동기 (PMLSM)의 디텐트력 저감에 관한 새로운 기술을 제안하고자 한다. 디텐트력은 입력전류 없이 영구자석과 철심 코어의 상호 작용으로 발생되며 2개의 성분 즉 슬롯효과와 단부효과로 나눌 수 있다. 슬롯효과와 단부효과를 줄이기 위하여 보극의 위치와 반폐슬롯 길이 변화에 따른 디텐트력 특성을 2차원 유한요소법(FEM)을 이용하여 해석한다. 그리하여 수치해석과 실험결과를 이용하여 보극 설치가 디텐트력을 줄이기 위한 효과적인 방법임을 입증하고자 한다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.810_811
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• 2009

본 논문에서는 하이브리드 전기자동차 구동에 적용되는 비선형 자기포화특성이 두드러진 매입형 영구자석 동기전동기의 돌극비에 따른 특성해석에 대해 나타낸다. 영구자석의 층수에 따라 달라지는 돌극비 특성을 구하기 위해 고정자, 회전자 형상 및 재질 등을 동일하게 두고 유한요소해석을 통해 자계해석을 하였다.