• Title/Summary/Keyword: Inductive Sensor

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Shape Design Optimization of Inductive Position Sensor to Improve Sensitivity (유도형 변위 센서의 민감도 향상을 위한 형상 최적 설계)

  • 홍준희;이동주;신우철
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2001.10a
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    • pp.250-254
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    • 2001
  • The resolution of analog sensor is determined by its sensitivity and amplitude of noise. This paper presents modeling of inductive gap sensor base on equivalent magnetic circuit and analysis of sensitivity. We can simulate static characteristic of inductive gap sensor using this model. Computer simulation show that sensor's sensitivity is affected by magnetic flux's leakage and fringing, and that they are affected by shape of sensor probe. Base on this, we designed shape of inductive position sensor probe.

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Modeling of Inductive Position Sensor and its Analysis (유도형 변위 센서의 모델링 및 해석)

  • 신우철;홍준희;이동주
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.249-252
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    • 1997
  • The resolution of analog sensor is determined by its sensitivity and amplitude of noise. This paper presents modeling of inductive gap sensor base on equivalent magnetic circuit and analysis of sensitivity. The model of inductive gap sensor is verified by the experimental results. Then we can simulate static characteristic of inductive gap sensor using this model. Computer simulation show that sensor's sensitivity and linearity are affected by magnetic flux's leakage and fringing, and that they are affected by shape of sensor probe.

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An Inductive Position Sensor for Self-sensing Magnetic Suspension System (셀프센싱 자기 부상계를 위한 인덕턴스형 변위센서)

  • 윤형진;이상헌;백윤수
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1038-1041
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    • 2003
  • The magnetic suspension system is used in many areas, because it has great advantages. such as no friction, no noise, no lubrication and so on, but it is a unstable system in natural. It must have a feedback control with the position is measured for a stable levitation. There are an eddy-current sensor, a capacitive sensor, an inductive sensor, and an optical sensor with a laser as the sensor which measures displacements without contact. Among them, an inductive sensor is made with lower price than others. And it has a good linearity. In this paper, a magnetic circuit leads a linear equation between an input as a displacement and an output as a voltage. Experiments establish that voltage change according to displacement is linear. This paper presents the preliminary study of an inductive position sensing for self-sensing magnetic suspension system.

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Control of a Magnetic Suspension System with Inductive Sensors for a High Vacuum Turbomolecular Pump (Inductive Sensor를 이용한 고진공 분자펌프용 자기부상계의 제어)

  • 노승국;박병철;정민경;노명규;박종권;경진호;구본학
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.361-365
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    • 2002
  • In this paper, a magnetic suspension system with inductive sensors fur a high vacuum turbomolecular pump(TMP) is discussed. The performance of designed inductive position sensor is evaluated by static and dynamic test, and the test results show sensitivity of about 6,000 V/m and dynamic bandwidth of 750 ㎐. The protype of magnetic suspension system is designed and constructed with 5-axis magnetic bearing, inductive sensor and BLDC internal motor. With DSP based digital PID control system, the prototype is examined its high damping ratio and stable operation up to 20,000 rpm of rotation.

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The Effects of Eddy Currents and Hysteresis on the Performance of Inductive Position Sensor for Magnetic Bearings (자기베어링용 유도형 위치 센서의 성능에 미치는 와전류와 히스테레시스의 영향)

  • Noh, Myoung-Gyu;Jeong, Min-Kyoung
    • Proceedings of the KSME Conference
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    • 2001.06b
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    • pp.36-41
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    • 2001
  • The performance of an inductive position sensor is described by the accuracy and the dynamic characteristics of the sensor. Both of these performance indices are affected by magnetic hysteresis and eddy currents. In this paper, a model of an inductive sensor is presented. This model includes the effects of hysteresis and eddy currents. Computer simulation shows that the sensitivity of the sensor is greatly affected by hysteresis and eddy currents. Repeability error increases with hysteresis and eddy currents effects. Results also show that eddy currents influence more on the sensor performance than hysteresis does. To reduce the effects of hysteresis and eddy currents, the sensor should be made out of thin laminations with high resistivity.

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A Theoretical Investigation for Improving Dynamic Characteristics of Inductive position sensor (유도형 변위 센서의 동적 특성 향상을 위한 이론적 고찰)

  • 신우철;홍준희;이동주
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.04a
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    • pp.149-154
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    • 2002
  • In a high speed spindle system, it is very important to monitor the state of rotating rotor. Particularly in active control spindle system, the position sensor must provide feedback to the control system on the exact position of the rotor. In order to monitor the state of a high speed spindle exactly, high accuracy and wide frequency bandwidth of sensors are important. This paper observes the factors which has an effect on dynamic performances of inductive position sensor.

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A Magnetic Circuit Model of Inductive Sensor Considering Eddy Currents and Hysteresis (와전류와 히스테리시스를 고려한 유도형 변위 센서의 자기회로 모델 개발)

  • 노명규;정민경;박병철
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.267-270
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    • 2002
  • The accuracy and the dynamic bandwidth are the two most important indices that an inductive position sensor is evaluated with. Eddy currents and magnetic hysteresis affect both of these performance indices. As the modulation frequency of the sensor increases to improve the dynamic bandwidth, the effects of eddy currents and hysteresis also increases, which results in the loss of accuracy. In this paper, a magnetic circuit model of the differential inductive sensor is developed. This model includes the effects of hysteresis and eddy currents. Experimental results confirm the validity of the model. The model predicts that the eddy current effects are not significant below the modulation frequency of 50kHz, as long as the lamination thickness is adequate.

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Characteristics Evaluation of Inductive Position Sensor for the State monitoring of a High Speed Spindle (고속 주축 상태 모니터링용 유도형 변위 센서의 특성 평가)

  • 신우철;홍준희;이동주
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.65-68
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    • 2002
  • In a high speed spindle system, it is very important to monitor the state of rotating rotor. Particularly in active control spindle system, the position sensor must provide feedback to the control system on the exact position of the rotor. In order to monitor the state of a high speed spindle exactly, High accuracy and wide frequency bandwidth of sensors are important. This paper describes the factors which has an effect on performances of inductive position sensor. We also report the experimental results that characterize the performances of the inductive position sensor.

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Application of a Textile-based Inductive Sensor for the Vital Sign Monitoring

  • Gi, Sun Ok;Lee, Young Jae;Koo, Hye Ran;Khang, Seonah;Kim, Kyung-Nam;Kang, Seung-Jin;Lee, Joo Hyeon;Lee, Jeong-Whan
    • Journal of Electrical Engineering and Technology
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    • v.10 no.1
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    • pp.364-371
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    • 2015
  • In this study, we developed a feasible structure of a textile-based inductive sensor using a machine embroidery method, and applied it to a non-contact type vital sign sensing device based on the principle of magnetic-induced conductivity. The mechanical heart activity signals acquired through the inductive sensor embroidered with conductive textile on fabric were compared with the Lead II ECG signals and with respiration signals, which were simultaneously measured in every case with five subjects. The analysis result showed that the locations of the R-peak in the ECG signal were highly associated with sharp peaks in the signals obtained through the textile-based inductive sensor (r=0.9681). Based on the results, we determined the feasibility of the developed textile-based inductive sensor as a measurement device for the heart rate and respiration characteristics.

RLSE Based Batteryless Telemetry Capacitive Sensor System

  • Lee, Joon-Tark;Kim, Kyung-Yup
    • Proceedings of the Korean Institute of Intelligent Systems Conference
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    • 2003.09a
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    • pp.318-321
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    • 2003
  • In case, sensor system performs where it is difficult to access physically and it is in the poor environment, it is limited to communicate by using wire and installing power module in sensor system. In this paper, it suggests how information is obtained from telemetry sensor by means of inductive coupling without battery. Comparing with the telemetry sensor system of inductive coupling by the power supply, this system estimates the capacitance of sensor with high precision in using RLSE, not the process of modulation and demodulation. In order to activate this system, inductive model is used and in case of time variant parameter, telemetry sensor system which has got high rate in accuracy is implemented by using the forgetting factor.

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