• Title, Summary, Keyword: Linear motor

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Topology Optimization of Linear Motor for Rope-less Elevator by Using Density Method and ON/OFF Method

  • Okamoto Yoshifumi;Takahashi Norio
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.5B no.3
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    • pp.233-237
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    • 2005
  • The reduction of the ripple of driving force is especially required for the practical utilization of linear synchronous motor for rope-less elevator. In this paper, the magnetic region of the linear motor is optimized by using topology optimization techniques (density method and ON/OFF method) in order to reduce the ripple of driving force. The optimal results of both methods are compared, and useful information for the optimal design of linear motor is obtained.

Improvement of the Thermal Characteristics of Synchronous Linear Motors through Structure Change (Synchronous Linear Motor의 구조변경에 의한 열특성에 개선)

  • 은인웅;이춘만;정원지;최영휴
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.367-370
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    • 1997
  • Linear motors can drive a linear motion without intermediate gears, screws or crank shafts. Linear motors can successfully replace ball lead screw in machine tools because they have a high velocity, acceleration and good positioning accuracy. On the other hand, linear motors emit large amounts of heat and have low efficiency. In this paper, the thermal behavior of a synchronous linear motor with high velocity and force is analyzed. To improve the thermal characteristics of the linear motor, structure of linear motor and cooler is changed. Some effects of an integrated cooler, an U-cooler and a thermal symmetrical cooler are presented.

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The Finite Element Analysis and the Geometric Optimal Design of Linear Motor (리니어 모터의 유한요소해석과 기하학적 최적설계)

  • Lee Tae Won;Jung Jae Han
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.12
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    • pp.67-74
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    • 2004
  • Linear motor has been considered to be the most suitable electric machine for high speed and high precision linear motion control. Thrust of linear motor is one of the important factor to specify motor performance. Maximum thrust can be obtained by increasing the current in conductor and is relative to the sizes of conductor and magnet. But, the current and the size of conductor have an effect on temperature of linear motor. Therefore, it is practically important to find design results that can effectively maximize the thrust of linear motor within limited range of temperature. Finite element analysis was applied to calculate thrust and numerical solutions were compared with experiment. The temperature of the conductor was calculated by the thermal resistance which was measured by experiment. The optimum design process was coded by the ADPL of ANSYS which is a 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 Stabilized Speed Control Modeling of Single-side Linear Induction Motor Considering End-effect (단부효과가 고려된 편측형 선형유도전동기의 안정속도제어 모델링)

  • Lim, Hong-Woo;Chae, Bong;Choi, Moon-Han;Lee, Kang-Yeon;Cho, Geum-Bae;Baek, Hyung-Lae
    • The Transactions of the Korean Institute of Power Electronics
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    • v.11 no.3
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    • pp.266-273
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    • 2006
  • 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.

Thermal Characteristic Analysis of a High-Speed HMC with Linear Motor and Magnetic Bearing (리니어모터와 자기베어링을 채용한 초고속 HMC의 열특성 해석)

  • Kim, S. I.;Lee, W. J.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.11-15
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    • 2002
  • This paper presents the thermal characteristic analysis of a high-speed HMC with spindle speed of 50,000rpm. The spindle is supported by two radial and axial magnetic bearings. and the built-in motor is located between the axial and rear radial magnetic bearings. The X-axis and Y-axis feeding systems are composed of linear motor and linear motion guides, and the Z-axis feeding system is composed of servo-motor, ballscrew and linear motion guide. The thermal analysis model of high-speed HMC is constructed by the finite element method, and the thermal characteristics in the design stage are estimated based on the temperature distribution and thermal deformation under the conditions related to the heat generation of built-in motor, magnetic bearings, linear motors, servo-motor, ballscrew, and so on.

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Research for ultra precision linear motor by using piezo stack actuators (적층형 압전재료를 이용한 초정밀 선형 모터에 관한 연구)

  • 임장환;김재환
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.649-654
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    • 2003
  • This paper is focused on the research of the ultra precision linear motor by using piezo stack actuators. The development of linear motor which can be controlled nano or micro scale is necessary for the precision manufacturing. Self-moving-cell principle is used for the design of linear motor Self-moving-cell linear motor is consisted of three cell structures, and each cell has two shells and one piezo-stack actuator. Each cell can do clamping and moving by two shell structures. The shell structure deformation by piezo stack actuator can move the linear motor by losing the clamping between the shall and guideway. This paper presents the design, manufacturing and test of the motor.

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Measurement and Analysis of Back-EMF and Thrust of a Linear Brushless DC Motor (선형 브러시리스 DC 모터의 역기전력과 추력 측정 및 분석)

  • 이춘호;김용일;현동석
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.8
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    • pp.183-192
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    • 1998
  • In this paper, we measure the back-EMF and the thrust of a linear brushless DC motor along the relative position between coils and magnets in various speed environments in order to obtain the back-EMF and the thrust as a function of a motor position. The measured back-EMF function and thrust function of the position differ from the analytical ones within 5%. The measured back-EMF and thrust function can, then, be employed in controlling the thrust ripple of the linear motor. Furthermore, to minimize the torque ripple of the linear motor, we suggest the design method to shape the back-EMF and thrust function of the linear motor.

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The Design of Long-Stator Linear Motor Drives for RailCab Test Track

  • Grotstollen Horst
    • Journal of Power Electronics
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    • v.5 no.2
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    • pp.166-172
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    • 2005
  • The basic equations of a doubly-fed long-stator linear motor for a shuttle-based railway system are established. They show which degrees of freedom exist for controlling the motor. The ratio of stator and rotor current proves to be an important parameter in determining the design of motors, converters and mechanics.

Study on Self-moving Cell Linear Motor Using Piezo-stack actuators (적층 압전 작동기를 이용한 Self-moving Cell 선형모터 연구)

  • 이진호;김재환;최관영
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.371-375
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    • 2001
  • The concept of a new linear motor that uses piezo-stack actuator is demonstrated. The working principle is far different from the conventional inchworm motor. This motor is based on the self-moving cell concept. The linear motor has three cells and each cell is constructed with one piezo-stack actuator and a shell structure. A cell train is constructed by connecting these cells and the cell train is fitted into a guide way with a proper interference. The cell train moves along the guide way, by activating each cell in succession. The moving motion of the motor is tested. Since this linear motor uses piezo-stack actuator with unified clamping cell, it can produce fast speed, high resolution and large push force.

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Novel Flexible Printed Circuit Windings for a Slotless Linear Motor Design

  • Hsu, Liang-Yi;Yan, Guo-Jhih;Tsai, Mi-Ching
    • Journal of international Conference on Electrical Machines and Systems
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    • v.1 no.1
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    • pp.61-66
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    • 2012
  • Linear motors has been developed for factory automation, transportation applications, among other applications. As the trend toward compact sizes in micro electronic products progresses, the required motor drives in these applications need to be downsized with increased power densities. It appears that the winding of miniature linear motors is the most awkward part to be scaled down from conventional motor designs when miniaturizing. This paper presents an alternative design for slotless linear motors. A novel flexible printed circuit winding has been applied to obtain a simplified but qualified result. Having explained the prototyping and inspection, a discussion is given to examine the achievement of this study.