• 제목/요약/키워드: Rotating machine

검색결과 451건 처리시간 0.023초

Development of a System for Diagnosing Faults in Rotating Machinery using Vibration Signals

  • Oh, Jae-Eung;Lee, Choong-Hwi;Sim, Hyoun-Jin;Lee, Hae-Jin;Kim, Seong-Hyeon;Lee, Jung-Youn
    • International Journal of Precision Engineering and Manufacturing
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    • 제8권3호
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    • pp.54-59
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    • 2007
  • It is widely recognized that increasing the accuracy and diversity of rotating machinery necessitates an appropriate diagnostic technique and maintenance system. Until now, operators have monitored machinery using their senses or by analyzing simple changes to root mean square output values. We developed an expert diagnostic system that uses fuzzy inference to expertly assess the condition of a machine and allow operators to make accurate judgments. This paper describes the hardware and software of the expert diagnostic system. An assessment of the diagnostic performance for five fault phenomena typically found in pumps is also described.

Iron Loss Analysis of a Permanent Magnet Rotating Machine Taking Account of the Vector Hysteretic Properties of Electrical Steel Sheet

  • Yoon, Heesung;Jang, Seok-Myeong;Koh, Chang Seop
    • Journal of international Conference on Electrical Machines and Systems
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    • 제2권2호
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    • pp.165-170
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    • 2013
  • This paper presents the iron loss prediction of rotating electric machines taking account of the vector hysteretic properties of electrical steel sheet. The E&S vector hysteresis model is adopted to describe the vector hysteretic properties of a non-oriented electrical steel sheet, and incorporated into finite element analysis (FEA) for magnetic field analysis and iron loss prediction. A permanent magnet synchronous generator is taken as a numerical model, and the analyzed magnetic field distribution and predicted iron loss by using the proposed method is compared with those from a conventional method which employs an empirical iron loss formula with FEA based on a non-linear B-H curve. Through the comparison the effectiveness of the presented method for the iron loss prediction of the rotating machine is verified.

prototype 패치 안테나를 이용한 고압 회전기의 부분방전 측정 연구 (PD Diagnosis on High Voltage Rotating by Using New Prototype Patch Antenna Sensor)

  • 키아우소 륀;신동훈;임광진;공태식;김회동;박노준;박대회
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 춘계학술대회 논문집 전기설비전문위원
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    • pp.169-171
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    • 2007
  • We studied the partial discharge detecting by sensing electromagnetic wave emitted from the partial discharge source in the HV Rotating Machine with the new prototype patch antenna sensor. In this study, we design new type of patch antenna based on microstrip technology and make many experiments of elaine testing compare with the existing HFCT and EM probe on stator winding of HV generator in the laboratory. This paper will mention comparison of experimental results based on the three kinds of sensors.

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대형 회전기 Axial Magnetic Force 해석 (The Analysis of the Axial Magnetic Force for Large Rotating Machines)

  • 이정일;김기찬;권중록;제준모
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2004년도 하계학술대회 논문집 B
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    • pp.827-829
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    • 2004
  • A characteristic of the rotating machine that has been receiving relatively little attention is the axial force on the rotor versus its axial displacement from magnetic neutral position. A knowledge of this force is essential to the economic application of thrust bearings for rotating machine and their connected loads. In this paper this axial force is analyzed and calculated and test values are verified with two different machines.

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영향계수를 이용한 고속 주축시스템의 자동밸런싱 기법에 관한 연구 (A Study on the Active Balancing Method for High Speed Spindle System Using Influence Coefficient)

  • 김봉석;김종수;이수훈
    • 한국정밀공학회지
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    • 제18권8호
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    • pp.48-53
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    • 2001
  • In order to increase productivity and efficiency, high-speed rotating machines become popular these days. The high-speed rotating machine is likely to vibrate and cause machine failure even though it has small unbalance. Therefore, a balancing technique is studied in this paper. Off-line balancing methods are inadequate to solve unbalance vibration problem occurring in the field due to flexible rotor effect, faster tool change, and shorter spin-up and down, etc. An active balancing is suggested to allow re-balancing of the entire rotating assembly in the machine when a tool is changed. This paper shows how to identify the dynamics of the system using influence coefficient and suggest an active balancing technique based on influence coefficient method for high-speed spindle system.

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The Design and Experiment of a Planar Patch Sensor for Partial Discharge Diagnostics in 6.6 kV Rotating Machine Stator Windings

  • Yang, Sang-Hyun;Park, Noh-Joon;Park, Dae-Hee;Kim, Hee-Dong;Lim, Kwang-Jin
    • Transactions on Electrical and Electronic Materials
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    • 제10권5호
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    • pp.173-176
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    • 2009
  • In the stator windings of a 6.6 kV rotating machine, internal discharges, slot discharges, and surface discharges are mainly caused by internal voids and insulation degradation. If a partial discharge(PD) occurs in an inner-part of the stator windings, it will cause electromagnetic pulses with wide frequency ranges. Discharge sparks and electromagnetic pulses generated from a discharge source, can be detected using various RF resonators like an EM sensor. In order to detect these types of electromagnetic sources, a planar patch sensor was designed and fabricated using a CST-MWS simulation, and PD signals from an artificially defected stator winding were also measured by the sensor proposed in this study. Furthermore, an HFCT was used as a reference sensor and compared with the proposed new planar patch sensor. In the results of the experiment, the planar patch sensor showed a similar performance to the HFCT sensor.

세라믹 커플러를 이용한 고전압회전기 고정자권선의 On-line 및 off-line 부분방전 특성 시험 및 분석 (Analysis and lest of On-line and off-line PD Testing for High Voltage Rotating Machines Stator Windings using Ceramic Coupler)

  • 오봉근;김현일;강성화;임기조
    • 한국전기전자재료학회논문지
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    • 제20권10호
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    • pp.895-900
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    • 2007
  • Partial discharge(PD) test can be performed either when the rotating machine is not operating(off-line) or during normal machine operation(on-line). This paper presents an on-line and off-line PD test on a large hydro-generator and induction motor using the same PD acquisition system(PDAS) and ceramic coupler(CC) sensor. PD signal characteristics of CC sensor proved similar with that of epoxy mica coupler(EMC) sensor as a results of PD test for simulated defect winding and frequency response test. A comparison of on-line and off-line PD test for PD characteristic parameters-phase resolved PD(PRPD), maximum PD value(Qmax) and PD occurrence energy(POE)-indicated that on-line PD test could reliably and effectively diagnose insulation conditions which were verified by off-line PD test.

Runout Control of a Magnetically Suspended High Speed Spindle Using Adaptive Feedforward Method

  • Ro Seung-Kook;Kyung Jin-Ho;Park Jong-Kwon
    • International Journal of Precision Engineering and Manufacturing
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    • 제6권2호
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    • pp.19-25
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    • 2005
  • In this paper, the feedforward control with least mean square (LMS) adaptive algorithm is proposed and examined to reduce rotating error by runout of an active magnetic bearing system. Using eddy-current type gap sensors for control, the electrical runout caused by non-uniform material properties of sensor target produces rotational error amplified in feedback control loop, so this runout should be eliminated to increase rotating accuracy. The adaptive feedforward controller is designed and examined its tracking performances and stability numerically with established frequency response function. The designed feedforward controller was applied to a grinding spindle system which is manufactured with a 5.5 kW internal motor and 5-axis active magnetic bearing system including 5 eddy current gap sensors which have approximately 15∼30㎛ of electrical runout. According to the experimental results, the error signal in radial bearings is reduced to less than 5 ,Urn when it is rotating up to 50,000 rpm due to applying the feedforward control for first order harmonic frequency, and corresponding vibration of the spindle is also removed.

전도 냉각을 이용한 고온 초전도 회전기용 모델 코일의 특성 평가 (Evaluation of a model coil characteristics for HTS rotating machine using conduction-cooled)

  • 이재득;백승규;손명환;이언용;김영춘;권영길;박민원;유인근
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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    • pp.725-726
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    • 2006
  • In large scale superconducting rotating machine, HTS field coils are constructed with many stacks of single or double pancake coils connected in series. In spite of its higher thermal stability, HTS field coil experiences some quench, which results in some part of burn-out in the field coils. Thus in the view point of the HTS rotating machine field coil design and testing, it was very important to predict the possibility of quench occurrence in the designed field coils. In this paper, a HTS racetrack coil constructed with two single pancake coils and one double pancake coil was tested in LN2 and cooling by GM refrigerator. It is wound using the Bi-2223 tape. The experimental details and results are presented in this paper.

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분리된 6.6kV급 고정자 권선의 부분방전 측정을 위한 Spiral 패치 안테나 센서 적용 연구 (Dismantled PD diagnosis on 6.6kV Stator Winding by Using Spiral Patch Antenna Sensor)

  • 키아우소 륀;신동훈;임광진;양훈;공태식;김희동;박노준;박대희
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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    • pp.211-212
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    • 2007
  • There have three kinds of partial discharge diagnosis testing: online, offline and dismantled testing on high voltage rotating machine. Our lab testing is dismantled testing, taking off pieces into individual parts of stator coil of high voltage rotating machine in laboratory. We investigate internal discharge, slot discharge, corona discharge and normal state on pre-made stator winding by using spiral patch antenna sensor. In this lab test we compare the experimental results of our spiral patch antenna sensor and reference commercial HFCT sensor.

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