• Title/Summary/Keyword: non-contact current sensor

Search Result 36, Processing Time 0.025 seconds

Vibration of rotating machinery due to proximity (Proximity에서 유도된 회전기계의 이상 진동)

  • 구재량;황재현;김두영;윤완노;김연환
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2003.05a
    • /
    • pp.532-535
    • /
    • 2003
  • Vibration of rotating machinery is a factor that is something to do with abnormal machinery. Former days, Perception of vibration at rotating machinery had used Shaft rider type. Shaft rider type was adhered to surface of shaft and detected vibration of rotating machinery. Recently, Perception of vibration at rotating machinery uses to non-contact sensor. Working principle of non-contact sensor is used of eddy current. Vibration at rotating machinery appears to deviation of eddy current. In this paper, We investigate abnormal vibration due to non-contact sensor.

  • PDF

Non-Contact Current Sensor Fabricated with LC Resonators (LC 공진소자를 이용한 비접촉 전류센서 연구)

  • Shin, Kwang-Ho
    • Journal of the Korean Magnetics Society
    • /
    • v.26 no.4
    • /
    • pp.137-141
    • /
    • 2016
  • There is a growing demand for non-contact current measurements for efficient use of electrical power and energy saving. In this study, I propose a non-contact current sensor using LC resonance by a resonance circuit composed of a sensor coil and 2 coupling coils for enabling a wireless measurement. The inductance of the sensor coil, which could be changed by applied current, causes the change of resonance frequency of the resonance circuit. A pair of magnet was attached to the ferrite core to apply a bias magnetic field that enabled the determination of the current direction. We obtained an output voltage change of 18 V with the current of -3~3 A. But, the output was nonlinear. In order to realize the non-contact current measuring method proposed in the present study, there is a need for a strict investigation of linearity and resolution for the future study.

Non-contact critical current measurement using hall probe (Hall probe를 이용한 비접촉 임계전류 측정)

  • Kim, Ho-Sup;Lee, Nam-Jin;Ha, Dong-Woo;Baik, Seung-Kyu;Kim, Tae-Hyung;Ko, Rock-Kil;Ha, Hong-Soo;Oh, Sang-Soo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2009.05a
    • /
    • pp.7-8
    • /
    • 2009
  • Non-contact critical current measurement apparatus was developed using hall probe which measures the magnetic field distribution across the width of superconducting tape. The hall probe consists of 7 independent hall sensors which lie in a line 600 ${\mu}m$. The difference between maximum and minimum magnetic field in the magnetic filed distribution is a main parameter to determine the critical current. As preliminary research, we calculated the magnetic field intensity at the middle sensor, which is a minimum magnetic field and generated by the circular shielding current modeled by Bean model. We confirmed that there are some parameters that affect on the minimum magnetic field; the distance between superconducting layer and hall sensor, the width of superconducting tape, and the critical current distribution across the width of superconducting tape. Among these parameters, the distance between superconducting layer and hall sensor highly influences on the minimum magnetic field.

  • PDF

Application of eddy current technique for the non-contact sensing of low concentration of electrolytic solution

  • Ismail, Abu Bakar Md.;Shida, Katsunor
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 1997.10a
    • /
    • pp.1310-1313
    • /
    • 1997
  • Application of eddy current sensing principle for the non-contact estimation of very low concentration of electrolytic solution is presented in this paper. for this application, a new, simple, low-cost, low-power structure for the eddy current sensor is proposed. By measuring the eddy current produced in the conducting electrolytic solution, the concentration is estimated. Therefore, the unknown concentration can be estimated comparing with the database which is prepared as the relation between the change in inductance and various concentrations of electrolytic solution. The concentration, as low as l ppm of the solutioin can be detected by this sensor. It was tested on various low concentration solutions of NaCl. It shows distinct response for various concentrations.

  • PDF

Proposition of copper-foil magnetic sensor for the two-axis remote measurement of bending vibration of a non-metallic cylinder (비금속 배관에서의 원격 2 축 굽힘 진동 측정을 위한 동박 패치형 자기 센서의 제안)

  • Kim, Jin-Ki;Han, Soon-Woo;Kim, Yoon-Young
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2007.11a
    • /
    • pp.322-325
    • /
    • 2007
  • This paper suggests a non-contact sensor for measuring bending vibration of a non-metallic cylinder in two orthogonal directions simultaneously. Recent research shows that a solenoid can pick up bending vibrations of a nonmetallic cylinder based on the reversed Lorentz force mechanism if an electrical conductive patch is attached to the cylinder. In this work, pairs of specially designed patches are used to make two independent paths for the current induced by bending vibrations, which enables the measurement of bending vibrations along two orthogonal directions simultaneously. The working performance of the developed sensor was verified by using two accelerometers.

  • PDF

Proposition of Copper - Foil Magnetic Sensor for the Two-axis Remote Measurement of Bending Vibration of a Non-metallic Cylinder (비금속 배관에서의 원격 2축 굽힘 진동 측정을 위한 동박 패치형 자기 센서의 제안)

  • Kim, Jin-Ki;Han, Soon-Woo;Kim, Yoon-Young
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.18 no.4
    • /
    • pp.381-385
    • /
    • 2008
  • This paper suggests a non-contact sensor for measuring bending vibration of a non-metallic cylinder in two orthogonal directions simultaneously. Recent research shows that a solenoid can pick up bending vibrations of a nonmetallic cylinder based on the reversed Lorentz force mechanism if an electrically conductive patch is attached to the cylinder. In this work, pairs of specially designed patches are used to make two independent paths for the current induced by bending vibrations, which enables the measurement of bending vibrations along two orthogonal directions simultaneously. The working performance of the developed sensor was verified by using two accelerometers.

Current sharing measurement using non-contact method for parallel HTS tapes conductor according to tape array geometry (병렬도체에서 선재의 배열형상에 따른 비접촉식 전류분류 측정)

  • Byun, S.;Park, M.;Choi, S.;Park, S.;Lee, S.;Kim, W.;Lee, J.;Choi, K.
    • Progress in Superconductivity and Cryogenics
    • /
    • v.10 no.1
    • /
    • pp.32-36
    • /
    • 2008
  • An HTS conductor with parallel HTS tapes is essential for a large power HTS device to flow a large current. One of the most important factor for this conductor is a current distribution. Non-uniform current distribution in parallel tapes makes the critical current of the conductor low and the AC losses high. In this paper we proposed a non-contact method which measured each current in parallel tapes by using an array of Hall sensors. A matrix can be derived from this array for calibration. The current distributions of 4 and 6 parallel tapes were measured.

Development of Optical Fiber Displacement Sensor for Non-contact Vibration Measurement in the High Speed Rotation System (고속회전체의 진동 측정용 비접촉 광섬유 변위센서 개발)

  • Lee, Kee-Seok;Hong, Jun-Hee;Shin, Woo-Cheol
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.22 no.8 s.173
    • /
    • pp.50-56
    • /
    • 2005
  • This paper is described a development of an optical fiber displacement sensor. The optical fiber sensor using an intensity modulated measures the displacement between target and sensor. A prototype sensor is composed of a transmitting part, a receiving part and a signal processing circuit. The experiment was conducted not only the sensor performance but also factors that affect intensity. The main performance of this sensor is resolution of 0.37um and the non-linearity $0.7\%$ FS and the dynamic bandwidth of about 6.3kHz. As a result of rotation test, the prototype sensor showed an equivalent performance to a commercial eddy current sensor.

A Study on the Development and Characteristics Evaluation of Non-Contact HFCT Sensor for Partial Discharge Measurement (부분방전 측정용 비접촉식 HFCT 센서개발 및 특성평가에 관한 연구)

  • Sang-Bo Han
    • Journal of IKEEE
    • /
    • v.28 no.2
    • /
    • pp.131-135
    • /
    • 2024
  • In this study, the sensor such as current transformer type was developed for measuring non-contact partial discharge in power electrical facilities, and the results of the characteristic evaluation were discussed. The frequency response characteristics of the HFCT sensor were shown to be measurable from 20 [kHz] to 20 [MHz]. The average sensitivity for the positive direction was 0.308 [mV/pC], and the negative direction was 0.459 [mV/pC]. Which showed that the sensitivity for the negative direction was better than that for the positive direction. The developed HFCT sensor is possible to measure very small partial discharge pulse signals and can be measured various types of partial discharge that may occur at power electrical facilities.

Development of New Low Frequency ECT Sensor to Detect Inner Defects(I) - Characteristic of Loss of Induced Electromotive Force - (내부결함 검출 가능한 저주파 ECT 센서개발(I) - 전자기 유도기전력 손실량의 특성-)

  • Park, Jeong-Ung;Jang, Mun-Seok;Gim, Guk-Ju;Kim, Beom-Ki
    • Journal of Welding and Joining
    • /
    • v.33 no.4
    • /
    • pp.57-62
    • /
    • 2015
  • Non-destructive techniques are used widely in the metal industry in order to control the quality of materials. Eddy current testing(ECT) is one of the most extensively used non-destructive techniques for inspecting electrically conductive materials at very high speeds that does not require any contact between the test piece and the sensor. The New ECT sensor which can detect inner defects was developed regardless the condition of surface. This sensor is verified to do experiment which measure the loss of induced electromotive force. The loss of induced electromotive force was measured in 5.4% and this low frequency ECT device can detect internal defects at depth 20 mm.