• 제목/요약/키워드: Inner Rotor

검색결과 138건 처리시간 0.032초

터빈로터 중심공 검사용 자기주행 공압형 로봇 개발 (Development of Self-Driven Pneumatic Robot for Boresonic Examination of Turbine Rotor)

  • 강배준;안명재;이철희
    • 드라이브 ㆍ 컨트롤
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    • 제18권1호
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    • pp.31-38
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    • 2021
  • This study presents a new principle for driving the robot aimed at reducing the position error for the boresonic examination of turbine rotor. The conventional method of inspection is performed by installing manipulator onto the flange of the turbine rotor and connecting a pipe, which is then being pushed into the bore. The longer the pipe gets, the greater sagging and distortion appear, making it difficult for the ultrasonic sensor to contact with the internal surface of the bore. A pneumatic pressure will ensure the front or rear feet of the robot in close contact with the inner wall to prevent slipping, while the ball screw on the body of the robot will rotate to drive it in the axial direction. The compression force required for tight contact was calculated in the form of a three-point support, and a static structural simulation analysis was performed by designing and modeling the robot mechanism. The driving performance and ultrasonic detection ability have been tested by fabricating the robot, the test piece for ultrasonic calibration and the transparent mock-up for robot demonstration. The tests have confirmed that no slipping occurs at a certain pneumatic pressure or over.

풍력 발전기용 3MW 매립형 영구자석동기발전기 해석 (The Analysis of 3MW Embedded Type PMSG for Wind Turbine)

  • 원정현;이상우;김동언;정진화;박현철
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2010년도 추계학술대회 초록집
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    • pp.180.1-180.1
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    • 2010
  • This paper introduces a 3MW embedded Permanent Magnet Synchronous Generator(PMSG) for wind turbine. The generator features 313mm stator inner radius and 974mm stator length. The blade rotor angular velocity is 15.7 rpm and the gear ratio is set to be 92.93. The nominal generator rpm at rated load is about 1459. The number of poles is six and embedded in the generator rotor. Embedded permanent magnet excitation shows higher reliability, and better efficiency. Using the finite element method, electromagnetic and thermal results are simulated by ANSYS and the results are summarized in this report.

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BLDC 모터의 열적 성능에 대한 설계 인자의 영향 (Effects of Design Parameters on the Thermal Performance of a Brushless DC Motor)

  • 김민수;이관수
    • 대한기계학회논문집B
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    • 제32권2호
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    • pp.141-148
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    • 2008
  • A numerical simulation of brushless DC motor is performed to elucidate thermo-flow characteristics in winding and bearing with heat generation. Rotation of rotor and blades drives influx of ambient air into the rotor inlet. Recirculation zone exists in the tiny interfaces between windings. The flow separation causes poor cooling performance in bearing part and therefore the redesign of the bearing groove is required. The design parameters such as the inlet location, geometry and bearing groove threshold angle have been selected in the present simulation. As the inlet location moves inward in the radial direction, total incoming flow rate and heat transfer rate are increased. Total incoming flow rate is increased with increasing the inlet inner length. The effect of the bearing groove threshold angle on the thermal performance is less than that of other design parameters.

A Mathematical Model Simulating A Grain-Straw Separation Process in an Axial-Flow Separator

  • Lee, Seung-Kyu-;Kim, Sung-Tae-;Park, Kyu-hong-
    • 한국농업기계학회:학술대회논문집
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    • 한국농업기계학회 1993년도 Proceedings of International Conference for Agricultural Machinery and Process Engineering
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    • pp.676-685
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    • 1993
  • A mathematical model was developed to quantify the separation process of threshed grain-straw mixtures. It was made to predict the separation loss from a separation unit consisted of stationary crimped sieve with rotating inner rotor. Experiments were performed to prove the mathematical model by changing various levels of pertinent variables for rice. Good Agreement between the simulated results and observed data under the various test conditions, such as inclination angle of the separator, vane pitch, rotor speed, MOG/G ratio, feed rate, and crop variety and moisture content, were confirmed.

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Mobile Storage용 초박형 Spindle Motor의 구조적 최적화 (Structural Optimization of Ultra Slim Spindle Motor for Mobile Storage)

  • 성부현;김수형;홍순교
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 추계학술대회논문집A
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    • pp.641-645
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    • 2001
  • Storage drives for mobile devices, such as laptop computers or PDAs, are changing now. The data density of storage drives is becoming higher and sizes of those are becoming smaller and thinner. Spindle motors for rotating disk are also becoming smaller and thinner. But, large torque is required to reduce seek time. In this research, inner rotor type spindle motor suitable for thin thickness has been developed. Rotor and stator are optimized structurally for large torque performance with small size. Especially, high vibration and shock performances, which are essential to mobile devices, are analyzed in detail.

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직동식 오일 펌프의 소음 발생 메커니즘 규명과 개선에 관한 실험적 연구 (An Experimental Study on Identification of Noise Generation Mechanism And Its Improvement in Gerotor Oil Pump)

  • 정병환;정원조;신달흔
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2012년도 춘계학술대회 논문집
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    • pp.121-127
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    • 2012
  • Whine noise in engine oil pump system was issued in developing an engine. Generally, A noise of engine oil pump largely are classified two cases. The first one is a gearing noise caused by relative motion of inner rotor and outer rotor. The other is fluid pulsation noise caused by oil pressure fluctuation. The aim of the paper is to identify a noise mechanism in engine oil pump and improve its Noise. Also, it suggests to the guide line on the design of oil pump.

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내전형 BLDC 전동기의 코깅 토크 저감을 위한 영구자석의 형상 설계 (Permanent Magnet Design for Reduction of Cogging Torque in Innner Rotor Brushless DC Motor)

  • 김성철;주수원
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2000년도 하계학술대회 논문집 B
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    • pp.864-866
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    • 2000
  • In the slotted motor, cogging torque is generated due to the interaction between the rotor magnets and the slots on the stator. It is well known that cogging torque produces vibration and noise which may be detrimental to the performance of position and speed control system. Hence, the prediction of cogging torque is very important at the design stage of BLDC motor. In this paper, permanent magnets with different arc an91e of inner and outer radius is proposed. The cogging torque of proposed model and conventional one is analyzed by 2-D FEM and compared.

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초전도 베어링의 마찰계수 측정 (Friction of Superconductor Bearing)

  • 한영희;;한상철;정년호;오제명;성태현
    • 한국초전도저온공학회:학술대회논문집
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    • 한국초전도저온공학회 2003년도 추계학술대회 논문집
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    • pp.237-239
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    • 2003
  • A high-temperature superconductor (HTS) journal bearing was studied for loss. Two HTS bearings support the rotor at top and bottom. The rotor weight is 4 kg and the length is about 300 mm. Both the top and bottom bearings have two permanent magnet (PM) rings with an iron pole piece separating them. Each HTS journal bearing is composed of six pieces of superconductor blocks of size 35$\times$25$\times$10 mm. The HTS blocks are encased in a cryochamber through which liquid nitrogen flows. The inner spool of the cryochamber is made from G-10 to reduce eddy current loss, and the rest of the cryochamber is stainless steel. The magnetic field from the PM rings < 10 mT on the stainless part. The rotational drag was measured over the same speed range. Results indicate that the 10 mT design criteria for magnetic field on the stainless part of the cryochamber is too high.

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유로 형상에 따른 선박용 발전기의 냉각 통풍 해석 (A analysis of cooling system for generator according to ventilation path)

  • 이동조;임남혁;설신수;김진오
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 춘계학술대회
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    • pp.1250-1254
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    • 2004
  • To develop more compact and light generators which have high capacity, the most important thing that should be considered is the inner cooling system. Under all circumstances, the temperature of rotor and stator windings must be kept below the maximum temperature of insulation to maintain reliability and prolong durability of the machine. Therefore, the development of more effective cooling system and the exact prediction of windings are essential to produce our unique generator model which is reliable and competitive in international market. In this study, the flow of cooling air and the temperature distribution of winding is analyzed by using computational fluid dynamics. This analysis can lead to optimize the structure of cooling system and predict a local temperature rise.

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Multi-Objective Optimization of Rotor-Bearing System with dynamic Constraints Using IGA

  • Choi, Byung-Gun;Yang, Bo-Suk;Jun, Yeo-Dong
    • 한국지능시스템학회:학술대회논문집
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    • 한국퍼지및지능시스템학회 1998년도 추계학술대회 학술발표 논문집
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    • pp.403-410
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    • 1998
  • An immune system has powerful abilities such as memory recognition and learning how to respond to invading antigens, and has been applied to many engineering algorithms in recent year. In this paper, the combined optimization algorithm (Immune-Genetic Algorithm: IGA) is proposed for multi-optimization problems by introduction the capability of the immune system that controls the proliferation of clones to the genetic algorithm. The new combined algorithm is applied to minimize the total weight of the rotor shaft and the transmitted forces at the bearings in order to demonstrate the merit of the combined algorithm. The inner diameter of the shaft and the bearing stiffness are chosen as the design variables. the results show that the combined algorithm can reduce both the weight of the shaft and the transmitted forces at the bearing with dynamic constraints.

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