• Title/Summary/Keyword: Magnetic sensor

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Study of Magnetic Sensor Harmonic Reduction to Improve Direct Driven Motors Performance Applied to Platform Screen Doors (스크린도어용 다이렉트 드라이브 모터 성능개선을 위한 자기식 센서의 고조파 저감 연구)

  • Kim, Yun-Soo;Lee, Ju
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.11
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    • pp.1645-1650
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    • 2015
  • This paper presents the 3-dimensional electromagnetic field analysis method and correction of sensor distortion that is used by a motor speed sensor. The magnetic sensors are being expanded due to lower price than the other speed sensors such as resolver and encoder. Magnetic sensor generates sine and cosine waves when the motor rotates. However, the sine and cosine signals are distorted due to magnetic noise, which makes the angle error of the sensor, generated near by the Hall element. This paper defines an optimal design variables by using the Taguchi method to minimize output distortion of the magnetic sensor and permanent magnet. To enhance reliability of the magnetic position sensor from sensitivity error, assembly amplitude mismatch and the electrical angle, 3-Dimensional electromagnetic finite element method and correction algorithm errors were performed in due of the magnetic sensor in order to improve the quality of the initial production model.

Highly-sensitive Magnetic Sensor using the Amplitude-Modulation (진폭변조를 이용한 고감도 자기센서)

  • 이상훈;남태철
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.90-95
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    • 1995
  • This paper describes the highly-sensitive Si magnetic sensor using the amplitude modulation in order to real ice the integrated magnetic sensor which to sensor a weak magnetic field. Generally, the most important two parameters in Hall IC which degrade the ability of magnetic detection are the variation of offset according to the variation of temperature and the noise of amplifiers. In this paper, we use a Hall element and compensator to reduce the offset and the nouse of amplifiers by Using amplititude modulation method.

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A Study on the Transmitter Design for Transmitting Output Power Enhancement of Active Magnetic Sensor (능동형 자기센서의 송신출력 향상을 위한 송신기 설계에 관한 연구)

  • Chung, Hyun-Ju;Yang, Chang-Seob;Jeon, Jae-Jin
    • Journal of the Korean Magnetics Society
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    • v.23 no.5
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    • pp.159-165
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    • 2013
  • A active magnetic sensor has been widely used in the underwater guided weapon system because it is able to detect a target accurately in close range, but the target doesn't have any good countermeasure to overcome the threat from the active magnetic sensor. Recently, in order to increase the damage area of target by shock wave with explosion of the underwater weapon system and to detect small target, the maximum target detection range of the active magnetic sensor needs to be increased. One method for improving maximum target detection range is to improve output power from transmitter through demagnetization factor minimization of a transmitting core. Thus, in this paper, we describe the study results on the transmitter core shape design to enhance output power of the active magnetic sensor.

Developing Wearable Joystick Device Using Magnetic Sensor (자기장 센서를 이용한 웨어러블 조이스틱 장치의 개발)

  • Yeo, Hee-Joo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.22 no.1
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    • pp.18-23
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    • 2021
  • There has been demand for many magnetic sensor applications, and to develop low-cost devices, it is critical to accurately understand the behavior of the magnetic field and the characteristics of magnetic sensors and target devices during initial development phase. The magnetic field has been known to have very complicated nonlinear data to calculate, so it has required expensive computing machines or research to accurately calculate the magnetic sensor values. However, this paper introduces a characteristic of a magnetic sensor called the giant magnetoresistance (GMR) and proposes simple and sufficient approaches to develop a wearable joystick device using a magnetic sensor. Particularly, this paper introduces the design factors for how to properly develop a low-cost wearable joystick device using magnetic sensors after carefully considering the mechanism of a real joystick and the characteristics of magnetic sensors. As a result, user test results are provided to show how users can operate this new wearable joystick device.

A Study on Transmitter and Receiver Design of Proximity Magnetic Sensor for Enhancement of Target Detection Range (표적 탐지거리 향상을 위한 근접자기센서 송수신기 설계에 관한 연구)

  • Ju, Hye-Sun;Chung, Hyun-Ju;Yang, Chang-Seob;Jeon, Jae-Jin
    • Journal of the Korea Institute of Military Science and Technology
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    • v.14 no.6
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    • pp.1151-1158
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    • 2011
  • Proximity magnetic sensor is able to detect the object target accurately in close range and it has been widely used in the underwater guided weapon system because there is no countermeasures from the target. In order to increase the damage of target by shock wave due to explosion of the underwater guided weapon system, the maximum detection range of the proximity magnetic sensor needs to be increased. In this paper, we describe the techniques of the optimum transmitting and receiving coils design using the Finite Element Method for the output power enhancement of the transmitter and the sensitivity improvement of the receiver. Finally, the proposed design techniques of the transmitter and the receiver were verified using a experimental setup and a prototype.

Vibration Measurement of an Automobile Exhaust System in Operation (구동중인 자동차 배기계의 진동 특성 측정)

  • Kim, Sung-Kook;Lee, Jong-Nam;Han, Soon-Woo;Chung, Tae-Jin;Lee, Sin-Young;Jang, Gang-Won
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.17 no.3
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    • pp.235-240
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    • 2007
  • In this work, the operational deflection shape(ODS) of an automobile exhaust system is measured by using a recently-developed magnetic sensor. The magnetic sensor is composed of a solenoid and two pairs of permanent magnets generating an antisymmetric magnetic field in the lateral direction inside the solenoid. Lateral movement of a ferromagnetic pipe inside the magnetic field of the suggested sensor induces an electromotive force in the solenoid corresponding to the lateral velocity of the pipe. Due to the simplicity and non-contact characteristics of the magnetic sensor, dynamic behaviors of the structures operating under high temperature such as an exhaust pipe can be efficiently observed. It is shown that the lateral ODS of an exhaust system can be successfully measured by the suggested sensors.

Magnetic-Shielding Effectiveness Analysis of the Trigger Assembly of Small Arms (소구경 개인화기 격발신호 발생장치의 자기차폐효과 분석)

  • Lee, Kisu;Ahn, Joon Mo;Chae, Je-Wook
    • Journal of the Korea Institute of Military Science and Technology
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    • v.21 no.4
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    • pp.456-463
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    • 2018
  • With the development of weapon systems by mounting various sensors, it makes important to analyze the precise functioning of sensor to external environment. In the case of small arms with magnetic sensor, the malfunction of small arms might be caused by strong external magnetic fields. In this study, the effects of magnetic sensor on external magnetic fields were analyzed, and optimal magnetic shield and shield structure were designed through M&S. In addition, the magnetic-shielding effectiveness of magnetic sensor in small arms was verified with commercial shielding materials. As a result, it was demonstrated that the Fe-Cu-Si-Nd-B with the structure of multi-layer metallic shields was shown the magnetic-shielding effectiveness of 83 % for an external permanent magnet and 19 % for an alternating magnetic field of 180 dBpT at 60 Hz, respectively.

The Position Decision Experiment of Magnetic Sensor in Ball-screw Driven Linear Stage (볼나사 구동 리니어 스테이지의 마그네틱 센서 위치결정 실험)

  • Cha, Young-Youp
    • Journal of Institute of Control, Robotics and Systems
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    • v.19 no.1
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    • pp.10-14
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    • 2013
  • High precision machining technology has become one of the important parts in the development of a precision machine. Such a machine requires high precision positioning as well as high speed on a large workspace. For machining systems having a high precision positioning with a long stroke, it is necessary to examine the repeatability of reference position decision. Though ball-screw driven linear stages equipped linear scale have high precision feed drivers and a long stroke, they have some limitations for reference position decision if they have not equipped the accurate home sensor. This study is performed to experimentally examine the repeatability for home position decision of a magnetic sensor as a home switch of ball-screw driven linear stage by using capacitance probe.

Gyroless Yaw Angle Compassing of Earth-Pointing Spacecraft Using Magnetic Sensor

  • Lee, Seon-Ho;Ahn, Hyo-Sung;Rhee, Seung-Wu
    • 제어로봇시스템학회:학술대회논문집
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    • pp.2055-2058
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    • 2004
  • This paper formulates a yaw angle determination algorithm for earth-point satellite. The algorithm based on vector observation, is implemented with the limited vector measurements. The proposed algorithm doesn't require gyro measurement data but magnetic sensor measurement data. In order to confirm the usefulness of the proposed method, we investigate the simulated telemetry data of the KOMPSAT-2, a satellite that is scheduled to be launched into a 685km altitude sun synchronous circular orbit in 2005.

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