• Title/Summary/Keyword: moving-coil-type

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Design and Extraction of Control Parameters of a Moving-Coil-Type Linear Actuator for Driving of Linear Reciprocating Motion Control Systems (리니어 왕복운동 제어시스템 구동용 가동코일형 리니어 액츄에이터의 설계제작 및 제어정수 도출)

  • Jang, Seok-Myeong;Jeong, Sang-Seop;Park, Hui-Chang;Mun, Seok-Jun;Park, Chan-Il;Jeong, Tae-Yeong
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.48 no.5
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    • pp.241-248
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    • 1999
  • Recently, many linear motion generators and motors are rapidly finding applications that ranges from short stroke linear motion vibrators, such as dynamic cone type loudspeakers to stirling engine driven linear reciprocating alternators, compressors, textile machines etc. The stroke-length may go up to 2m, and the maximum speed is in the range of 5 to 10m/s with oscillating frequency as high as 15 kHz. Therefore, the linear oscillating actuators(LOAs) may be considered as variable speed drivers of precise controller with stoke-length and reversal periods during the reciprocating motion. In this paper, the design, fabrication, experiments, and extraction of control parameters of a moving coil type LOA for driving of linear reciprocating motion control systems, are treated. The actuator consists of the NdFeB permanent magnets with high specific energy as the stator produced magnetic field, a coil-wrapped nonmagnetic hollow rectangular bobbin structure, and an iron core as a pathway for magnetic flux. Actually, the design is accomplished by using FEM analysis for the basic configuration of a magnetic circuit, and characteristic equations for coil design. In order to apply as the drivers of a linear motion reciprocating control system, the control parameters and circuit parameters, such as input voltage-stoke, exciting frequency-stoke, coil inductance and so on, are extracted from the analysis and experiments on concerning a fabricating LOA.

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Design and Characteristic Analysis of Linear Oscillating Actuator with Structure (직선 왕복 액추에이터의 구조에 따른 설계 및 특성 검토)

  • Kim, Hae-Joong;Lee, Choong-Sung;Hong, Jung-Pyo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.4
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    • pp.537-544
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    • 2015
  • This paper provided two types of design method on moving core type LOA and one type of design method on moving coil type LOA, and compared and examined each of its characteristics. In order to conduct parametric design process, voltage equation was used to schematize Lmin/K and L/M map, and the schematized map was used to determine Lmin, K or L, M. In order to meet requirements such as thrust force and input voltage and to satisfy the target values of Lmin, K or L, M, the types and sizes of each type were designed using geometry design process. 2-FEA was conducted for each of the designed model. After examining thrust force based on the location of the mover, Type-1 showed radical change in thrust force as movers moved, and Type-2 and Type-3 showed constant appearance of thrust force. The total volume of the designed LOA model was compared to select the model with highest thrust force density. Also, the weight of the mover for each model was compared in order to select the model that was predicted to have highest mechanical responsiveness and stroke characteristics.

A Performance Analysis of Active Mount with Moving-Coil type Electromagnetic Actuator Installed on the Elastic Foundation (탄성지지된 가동코일형 능동마운트의 성능 분석)

  • Jung, Woo-Jin;Bae, Soo-Ryong;Jeon, Jae-Jin
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2014.10a
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    • pp.227-231
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    • 2014
  • Underwater radiated noise is one of the vital factors in underwater weapon systems like submarine. A passive elastic mount is an effective reduction method for the vibration from a ship-board machinery transmitted to the hull which is radiated as noise outside the hull. A passive elastic mount shows the limitation on the vibration reduction and needs multi stage mounting system including double stage one to meet the required underwater radiated noise criteria. It is necessary for the multi stage mounting system to consider the large displacement in the underwater shock explosion. So it is difficult to apply the multi stage mounting system in submarine because of space limitation. Also recent navy sonar system are trying to have the capability to detect the ship-borne acoustic signals in the low frequency range. An alternative to the passive mount is an active mount with moving-coil type electromagnetic actuator based on a conventional rubber mount in the low frequency range. In the previous paper, 4 active mounts with moving-coil type electromagnetic actuator based on the rubber mount were installed on the hard floor of the facility, which means no consideration on the elastic foundation effect for the control of the active mounts was taken into account. In this study, an experimental performance analysis on the active mount was carried out using 4 active mounts installed on the cylindrical structure to investigate the elastic foundation effect.

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Development of a Hybrid Haptic Master System Without Using a Force Sensor (힘 센서를 이용하지 않는 혼합형 햅틱 마스터 시스템의 개발)

  • Park, Gi-Hwan;Bae, Byeong-Hun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.25 no.8
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    • pp.1308-1316
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    • 2001
  • A hybrid type master system is proposed to take the advantage of the link mechanism and magnetic levitation mechanism without using a force sensor. Two different types of electromagnetic actuators, moving coil type and moving magnet types are used to drive the master system which is capable of 4-DOF actuation. It is designed that the rotation motions about x-y axis are decoupled and the whole system is represented by simple dynamic equations. The force reflection is achieved by using the simple relation between the force and applied current and position. The simulation and experimental results are presented to show its performance.

Design of Hybrid Mount to Naval Shipboard Considering Shock Resistance (내충격 성능을 고려한 함정용 하이브리드 마운트의 설계)

  • Jo, Hye-Young;Shin, Yun-Ho;Moon, Seok-Jun;Jung, Woo-Jin
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2012.10a
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    • pp.102-107
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    • 2012
  • In this study, the design procedure of hybrid active mount by an electro-magnetic actuator is proposed to reduce the transmitted force from naval shipboard equipment to ship hull structure. The hybrid type mount which is composed of a passive rubber element and an electro-magnetic actuator is introduced and, through the vibration measurement for the objective pump system, the required force of the actuator is computed and discussed in detail. The initial designs were supposed for three types, one is moving coil type actuator and the others are moving permanent magnet type actuators. Based on the initial design concept, the final designs considering shock resistance and interference with mover and stator are proposed and examined.

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Design and Analysis of a Linear Motor for Slim-line ODD (소형 광디스크 드라이브용 선형 구동기의 설계 및 특성 해석)

  • Shim, Min-Taek;Park, Joon-Hyuk;Baek, Yoon Su
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11b
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    • pp.794-798
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    • 2002
  • This paper deals with a moving coil type linear motor for fast access of the miniature ODD. This slim-line motor is composed of the mover supported by guide mechanism, the coil wound into it, and the yoke attached to the permanent magnet for stator. The driving force is generated by the PM of the stator and the current in the coils of the mover. Magnetic circuit analysis and Finite Element Method are applied to estimate the thrust force at air gap. In order to compare the force characteristics between two methods, various experiment results are applied to verify on a prototype. Also the flexible modes of the motor are predicted through the FEM and the structural components are modified to locate this on high frequency region.

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A Study of Bending Using Long Type Coil by Discrete Method (다분할 해석법에 의한 장형코일의 곡가공 연구)

  • Lee, Young-Hwa;Jang, Chang-Doo
    • Journal of the Society of Naval Architects of Korea
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    • v.45 no.3
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    • pp.303-308
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    • 2008
  • The induction heating is more efficient for a plate bending because of its easy operation and control of working parameters, compared with the heating by a gas torch. The existing axis symmetric analysis method could neither handle initial curved plates nor be used in the optimization of coil shapes because of its limit of an axis symmetric coil shape. But the proposed method using some discrete part models and analysis processes could overcome these difficulties and show more accurate results in temperatures and deflections of flat or curved plates with initial curvature than those in the existing axis symmetric analysis method. This method is composed of the multi-disciplinary analyses such as an electro magnetic analysis, a heat transfer analysis and a deformation analysis based on inherent strain approach per each step. Traditionally, the coil shape in the induction heating is circular shape and it needs the moving process along heating lines. To overcome this, the 'Long Type Coil' with some linear parallel coils was proposed. It did not need the moving process along heating lines and reduced the heating process time. The results of experiments were compared with those of the simulation.

Improvement of Dynamic Characteristics for Optical Pickup Actuator by Changing Coil Shape (코일형상 변화에 의한 광픽업 액츄에이터의 동특성 개선)

  • Kim Choong;Song Myeong-Gyu;Lee Dong-Ju;Park No-Cheol;Park Young-Pil
    • 정보저장시스템학회:학술대회논문집
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    • 2005.10a
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    • pp.69-70
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    • 2005
  • In this paper, slim type optical pickup actuator was fabricated and its FE model was tuned to experimental results through precise coil models. In order to widen its control bandwidth, stiffness of moving parts was increased by changing shape of coil section. Finally, we checked that flexible mode frequency and gain margin was increased.

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Design Optimization of Moving-Coil Type Linear Actuator Using Level Set Method and Phase-Field Model (레벨셋법과 페이즈 필드 모델을 이용한 가동코일형 리니어 액추에이터 최적설계)

  • Lim, Sung-Hoon;Oh, Se-Ahn;Min, Seung-Jae;Hong, Jung-Pyo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.10
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    • pp.1223-1228
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    • 2011
  • A moving-coil type linear actuator has been widely used in the system reciprocating short stroke because of its several advantages, such as the structural simplicity, low weight and a fast control response speed. This paper presents a design approach for improving the actuating performance with a clear expression of optimal configuration represented by a level set function. The optimization problem is formulated to minimize the variation of magnetic force at every moving displacement of the mover for fast and easy control. To consider the manufacturability of actuator, the concept of phase-field model is incorporated to control the complexity of structural boundaries. To verify the usefulness of the proposed method, the core design example of cylindrical linear actuator is performed.

Stability Analysis of Dunnage for Transportation of a Steel Roll Coil using Powder of Waste Tire and Cord-rubber Scrap (폐타이어 고무분말과 코드-고무 스크랩을 이용한 철재 롤코일 선박운송용 Dunnage 안정성 해석)

  • Kwac, Lee-Ku;Kim, Hang-Woo;Ha, Jae-Ho;Kim, Jae-Yeol;Kim, Hong-Gun
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.15 no.6
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    • pp.22-31
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    • 2006
  • When ironwork, especially steel roll coil, is transported to customers, land transportation and sea transportation are usually used. To transport steel roll coil fast and safe without damaging it, it is necessary that the steel roll coil has to be in stable condition. These days, apitong, which is all imported from overseas, is being used to support the steel roll coil, but because of apitong's rigidity, it damages the coil and when the coil is damaged, it is hard to fix. Due to the fact that recovering damage of the coil is almost impossible, we have to find the new type of dunnage that can substitute the apitong. In this paper, the arrays and the kinds of reinforcements, and rectangular type and trapezoid of dunnage will be talked about. The phenomenon of rolling and the impact when the carrier start moving and stop will be talked about as well. Therefore, we are going to develop a dunnage that does not damage ironwork and has better recovery and softness than existing apitong dunnage.