• Title/Summary/Keyword: Model coil

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Multi-domain topology optimization of pulsed magnetic field generator (교번자기장 발생기의 다 영역 위상최적설계)

  • Lee, Jang-Won;Wang, Se-Myung
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.872-873
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    • 2011
  • This paper presents a multi-domain topology optimization using the harmonically excited coil and the iron in order to focus pulsed magnetic field (PMF). The design sensitivity of the harmonic magnetic field is derived by adjoint variable method. As a result of the optimization, PMF is considerably concentrated on the objective domain with much less leakage than the initial model.

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Positioning control of a redundant actuator

  • Sasaki, M.;Setta, M.;Satoh, K.;Fujisawa, F.
    • 제어로봇시스템학회:학술대회논문집
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    • 1994.10a
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    • pp.605-610
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    • 1994
  • This paper discusses the solution to the precise positioning control problem applied to a simple model of a dual stage or redundant positioner. The dual stage actuator presented here uses a VCM(Voice Coil Motor) as a coarse actuator and a piezoelectric actuator as a fine actuator. By adopting controllers with two-degree-of-freedom and by optimizing H$_{2}$ faster precise tracking can be realized. Experimental and numerical results are presented to demonstrate the control effects.

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4-Axis Decentralized Control of Magnetic Bearing Equipped whth Collocatd Capacitance Sensor (동위형 축전 센서가 장착된 자기베어링의 4 축 분산식 제어)

  • 신동원
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.04a
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    • pp.336-340
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    • 1996
  • This paper presents the development of a collocated capacitance sensor and its application to the decentralized PID controller design for 4-axis magnetic bearing system. The main feature of the sensor is that it is made of a compact printed circuit board (PCB) so that it can be built in to the actuator coil of the magnetic bearing unit. The signal processing unit has been also developed. Then, decentralized PED controller is designed using simplified rotor system model. Finally, the experimental results on the performance of the collocated sensor based decentralized PID controller for a magnetic bearing rotor system is presented.

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A Study on the Stabilization of Magnetically Auspended Bearing System (자기부상 베어링의 제어에 대한 연구)

  • 이교일;한동철;백승헌;이정훈;장인배
    • 제어로봇시스템학회:학술대회논문집
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    • 1990.10a
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    • pp.805-810
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    • 1990
  • Optimal control systems for a radial magnetic bearing are proposed and tested. An electromagnet system model is developed to predict bearing forces as functions of changing coil currents and rotor position. Models of the multi-mass rotor supported by the magnetic bearings are developed and confirmed, and theoretical relationships are expressed in the form of state equation. As a result of computer simulation, the state feedback with optimal procedure is considered to be more effective for magnetic bearing systems than the classical method.

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Displacement Sensorless Active Magnetic Bearing Control by Current Measurement (전류신호를 이용한 능동 자기 베어링계의 제어)

  • 권계시;정호섭;이종원
    • Journal of KSNVE
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    • v.5 no.1
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    • pp.49-57
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    • 1995
  • An electronic circuit device is developed such that the displacement between an electromagnet and a moving target can be estimated from the coil current measurement, and then applied to an active magnetic bearing system. In order to levitate the shaft without using displacement sensor the stable control gains are obtained from the linearized model which includes the gap estimation circuit. Experimental results show that the shaft, by the estimated gap feedback, can be levitated within $\pm$6 ${\mu}m$ positioning error.

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Optimization of Slotless type Permanent Magnet Linear Synchronous Meter using Genetic Algorithms (유전 알고리즘을 이용한 Slotless type PMLSM의 최적화)

  • Lee, Dong-Yeup;Moon, Jae-Youn;Yoon, Kang-Jun;Kim, Gyu-Tak
    • Proceedings of the KIEE Conference
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    • 2003.07b
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    • pp.849-851
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    • 2003
  • This paper is deal with the method of design for optimum thrust model using genetic algorithms in slotless Permanent Magnet Linear Synchrous Motor (PMLSM). Characteristic analysis method is used 3D space harmonic analysis method. Design parameters are PM width and coil width.

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Design of a VCM actuator for dual servo system

  • Choi, Hyeun-Seok;Han, Chang-Soo;Kim, Seung-Soo;Kim, Eung-Zu;Choi, Tae-Hoon;Na, Kyoung-Hwan
    • 제어로봇시스템학회:학술대회논문집
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    • 2004.08a
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    • pp.301-306
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    • 2004
  • In this study, Dual servo mechanism with VCM(Voice Coil Motor) and PZT is designed for a high precision force and position control. We designed the VCM actuator and dual servo mechanism with leaf spring. VCM actuators, with their high linearity, simple structure, low weight, and high efficiency, are increasingly being used in micro-positioning applications. There are many kinds of VCM with a structure. VCM actuators are divided into two types by moving parts. One is moving magnet type and the other moving coil type. We described the properties of these two types of VCM. Design parameters of VCM are defined through the FEM simulation analysis of magnetic field and dynamic model of dual servo mechanism. These researches help to for decreasing loss in the air gap of VCM. We present dual servo mechanism is effective mechanism for a force control in hi h precision, properties of designed VCM.

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Performance Loss & Heat Transfer Characteristics of Synchronous Motors under Various Driving Conditions (구동 조건 변화에 따른 동기 전동기의 성능 손실 및 내부 열전달 특성)

  • Choi, Moon Suk;Um, Sukkee
    • Transactions of the Korean Society of Automotive Engineers
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    • v.21 no.3
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    • pp.165-173
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    • 2013
  • Core loss has a major effect on heat generation in synchronous motors with surface-mounted permanent magnets (SPMs). It is essential to perform heat transfer analysis considering core loss in SPM because core loss is seriously affected by torque and speed of motors. In the present study, mechanical loss, core loss and coil loss are evaluated by measuring input and output energies under various driving conditions. For a better understanding heat transfer paths in synchronous motors, we developed a lumped thermal system analysis model. Subsequently, heat transfer analysis has been performed based on acquired energy loss, temperature data and thermal resistance with three types of SPM. It is shown that the torque constants decrease by Max. 10% as speed increase. At the rated torque, the core loss is Max. 10.9 times greater than the coil loss and the hysteresis loss of magnets is dominant in total loss.

Equivalent Impedance Modelling and Frequency Characteristic Analysis of Linear Oscillatory Actuator System Considering Mass/spring System (질량/스프링 계를 고려한 리니어 왕복 액추에이터 시스템의 등가 임피던스 모델링과 주파수 특성 해석)

  • Jeong, Sang-Seop;Jang, Seok-Myeong
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.7
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    • pp.370-378
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    • 2002
  • As resent trends in structural construction have been to build taller and larger structures than any time in the past, they have had high flexibility and low damping that can cause large vibration response under severe environmental loading such as earthquakes, winds, and mechanical excitations. The damper with mass and spring is one approach to safeguarding the structure against excessive vibrations. In this paper, the lumped electrical circuit approach of mass/spring system is used to model the mechanical aspects according to the frequency. Therefore, the mass/spring system can be dealt with here and linked with the equivalent circuit of electric linear oscillatory actuator(LOA). Analysis models are two types of vibration control system, active mass damper(AMD) and hybrid mass damper(HMD). AMD consists of the moving coil LOA with mass only The LOA of HMD with mass and spring is composed of the fixed coil and the movable permanent magnet(PM) field part. The PM field part composed magnet modules and iron coke, is the damper marts itself. We Present the motional resistance and reactance of mass/spring system and the system impedance of AMD and HMD according to the frequency.