Comparison between Asynchronous and Synchronous Linear Motors as to Thermal Behavior

Eun, In-Ung Korean Society for Precision Engineering 2001 International Journal of Precision Engineering and Vol.2 No.3

A linear motor has a lot of advantages in comparison with conventional feed mechanisms: high transitional speed, acceleration, high control performance and good positioning at high speed. Through the omission of a power transfer element, the linear motor shows no wear and no backlash, has along lifetime and is easy to assemble. Recently, the two types of linear motors, asynchronous and synchronous linear motors, are often applied to machine tools as a fast feed mechanism. In this paper, a comparison between the two types of linear motors as to power loss and thermal behavior is made. The heat sources of the linear motor-the electrical power loss in the motor and the frictional heat on the linear guidance-are measured and compared. Also, the temperature on the linear motor and machine structure is measured and presented.

A New and Effective Controller for Inductor Motor Drives using Direct–Decoupling Methodology based on exact linearization algorithm and Adaptive Back Stepping Technology

Anh Tuan DINH,Phung Quang NGUYEN,Minh-Duc LE 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10

Control of Inductor Motors is a difficult task because of the motors’ non-linear nature. Hence, the Inductor Motors are usually expressed by complicated non-linear models. This paper presents a new and effective method for modeling stator current and estimating rotor flux of an induction motor by applying Direct?ecoupling Methodology. A nonlinear control approach with full state feedback linearization has been used to construct the decoupling form of the induction motors. A new current controller named “irect-decoupling” based on exact linearization algorithm of the motor current model has been proposed. The obtained linear system in a new state-space is very convenient to design the current controller and the rotor flux estimator for induction motors. A linear Kalman filter has also been derived to construct an observer for rotor flux. Effectiveness of the new adaptive backstepping controller for induction motors and Kalman filter for observation of rotor flux has been verified by simulations and experiments in wide ranges of motor speed. Simulations and experiment results show clearly that the rotor flux can be well estimated in all operating conditions and performance of induction motors under all dynamic modes can be improved by using the new developed controller.

단부효과가 고려된 편측형 선형유도전동기의안정속도제어 모델링

임홍우,채봉,최문한,이강연,조금배,백형래 전력전자학회 2006 전력전자학회 논문지 Vol.11 No.3

In difference with the rotary type electrical machinery, the single-sided linear induction motor(SLIM) that generates the direct thrust, is widely used for the operation system of electrified railroad, lope-less elevation system, conveyer system, and so on. The operational principle of single-sided 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 space vector pulse width modulation(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 has modeled the dynamic characteristic analyzing methode, and calculated efficiently the end effect by using equivalent circuit methode in the operating linear induction motor control system. 선형유도전동기의 순시 속도에서의 1,2차 상대 위치이동으로 나타나는 동 특성과 이 때의 단부효과를 고려한 등가회로 해석방법을 이용하여 시스템을 모델링하고 SVPWM 구동시스템에 적용한 정속도 제어 특성을 부하조건에 따른 동작특성으로 시뮬레이션하여 SVPWM 구동 편측형 선형유도전동기시스템에 적용가능성을 입증하였다.

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

Tae-Won Lee 한국정밀공학회 2005 International Journal of Precision Engineering and Vol.6 No.4

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.

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

Lee Tae-Won Korean Society for Precision Engineering 2005 International Journal of Precision Engineering and Vol.6 No.4

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.

Optimum design of the cored linear motor using experiment design

서성일,김낙수 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.8

Recently, a linear motor has been becoming widely popular in office automation (OA) and factory automation (FA) systems due to its simple structure, high-speed operation, and precise positioning. In this study, a cored linear motor was designed to have a large thrust and small ripple because these are considered as indicators of motor performance. The thrust and ripple of the linear motor can be calculated by a finite element method (FEM) commercial program such as ANSYS. To design the cored linear motor, first, the design variables were selected through ANOM and ANOVA. The response surface method was applied to formulate the cost function of the second-order regression model, which can evaluate motor performance. By optimizing the cost function, it was possible to realize quickly the optimum design for a cored linear motor. As a result, the performance of the motor was improved.

유한요소법을 이용한 1열 및 2열 수직 배열형 선형 동기전동기의 특성 비교

김병찬(Byeong-Chan Kim),김창업(Chang-Eob Kim) 호서대학교 공업기술연구소 2021 공업기술연구 논문집 Vol.40 No.2

수직 배열형 선형 동기전동기는 기존의 선형 동기전동기에 비해 수직력을 줄일 수 있으며, 제작이 쉽고 작은 공간에서 큰 힘을 낼 수 있다. 본 논문에서는 2열 수직 배열형 영구자석 선형 동기전동기의 특성을 유한요소법을 이용하여 특성을 해석하고 1열 수직 배열형 선형 동기전동기의 특성과 비교하였다. 추력을 증가시키기 위해 1열 선형 동기전동기의 구조를 변경하여 2열 수직 배열형 선형 동기전동기의 구조를 제안하고 추력 및 디텐트력을 해석하고 비교하였다. 해석 결과 2열 수직 배열형 영구자석 선형 동기전동기는 1열 수직 배열형 영구자석 선형 동기전동기보다 추력/중량이 73.55 N/kg에서 84.54 N/kg에서 약 15% 증가함을 확인하였다. Compared with the conventional linear synchronous motor, the perpendicular type linear synchronous motor can reduce the normal force, and it is easy to manufacture and can generate a large force in a small space. In this paper, the characteristics of 2-line perpendicular permanent magnet linear synchronous motor were analyzed using the finite element method and compared with the characteristics of a 1-line perpendicular linear synchronous motor. In order to increase the thrust, a 2-line perpendicular linear synchronous motor was designed and analyzed. The analysis results showed that the thrust/weight was increased about 15% : 73.55 N/kg for 1-line perpendicular linear synchronous motor, 84.54 N/kg for 2-line perpendicular linear synchronous motor.

스테이터 모듈의 열해석을 고려한 이동체의 구조설계

이정명(J. M. Lee),한동섭(D. S. Han),이성욱(S. W. Lee),한근조(G. J. Han),이권순(K. S. Lee) 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.3 No.1

선형모터의 설계에 있어서 열적 거동의 파악은 모터의 연속 추력 및 열변형과 관련하여 중요한 고려요소 중의 하나이다. 본 연구에서는 항만자동화를 위한 차세대 컨테이너의 수평이송시스템인 LMTT (Linear Motor-based Transfer Technology)용 선형모터의 설계를 위해 고정자의 코일에서 발생되는 열에 의한 이동체의 온도분포를 분석하여 고정자 모듈의 열해석을 고려한 이동체의 구조설계에 관한 연구를 수행하였다. 먼저, 선형모터의 주요부품의 치수를 설계하고, 다음으로 고정자 모듈의 발열을 고려한 이동체의 온도분포를 분석하여 열-구조 연성해석을 수행하였다. 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-analysis of the linear motor considering the thermal analysis of the stator module.

주행 집전계 시험기의 주행 대차용 선형 유도전동기 설계에 관한 연구

함상환(Sang-Hwan Ham),조수연(Su-Yeon Cho),이주(Ju Lee) 대한전기학회 2011 전기학회논문지 Vol.60 No.4

This paper presents design process of linear induction motor in dynamic tester for catenary-current collection. To minimize length of rail for dynamic tester for catenary-current collection, accelerating performance of the linear induction motor is very important. So the design process of linear induction motor considered in this paper is different with general design process of linear induction motor, because dynamic tester has three type driving region, as accelerating region, constant speed region, and braking region. Considering accelerating performance of motor, distance and time from starting point to constant speed region were concerned for load condition of motor. Designed linear induction motor was analyzed by 2-dimensional finite element method. Using mechanical dynamics simulation with analysis result of 2-dimensional finite element method and accelerating performance of designed motor was proved.

교육매체 활용 : Linear Force Motor를 이용한 설계와 해석 교육매체 개발

박창순 ( Chang Soon Park ) 한국실천공학교육학회 2012 실천공학교육논문지 Vol.4 No.1

전기기기 설계는 전통적이고 고전적인 방식을 이용하여 자기회로를 고려한 기기의 크기를 결정하고 권선방식과 권선을 정하고 해석프로그람을 이용하여 자속밀도와 토크를 계산하는 절차로 진행된다. 그러나 전기기기는 형상이복잡하여 학생들이 설계하는 절차를 이해하고 해석하는데 많은 어려움을 겪고 있어 교육매체 개발이 매우 필요하다. 본 논문에서는 비교적 형상이 단순하여 자기회로 계산이 복잡하지 않고 전자기적 크기에 의한 추력의 발생과 해석을 쉽게 이해할 수 있는 Linear Force motor를 이용하여 설계절차를 설명하고 각 부위의 자속밀도를 설계프로그람을 이용하여 도시함으로써 쉽게 이해할 수 있도록 하였다. For design of a electrical Machine it is used conventional design methode to determine size with considering of magnetical circuit and windings. After this process, Flux density and Torque are calculated with FEM program. But most electrical machines are complicated in their configuration, therefore it is not easy to understand the design process and analyzing methode. We need to develop a educational material. In this paper using Linear force motor, which is relatively not complicated in their configuration and easy to understand the relationship between electro magnetics and force, will be explained the design process and calculating process with Finite element methode. And with FEM program will be calculated and illustrated flux density in each part and Force of the Linear force motor easy to understand.