• Title/Summary/Keyword: Hall-effect sensor

Search Result 109, Processing Time 0.031 seconds

A Study on InSb Magnetic Sensor using Hall Effect (Hall효과를 이용한 InSb가 자기 Sensor에 관한 연구)

  • Jeon, Chun-Saeng
    • Korean Journal of Materials Research
    • /
    • v.4 no.1
    • /
    • pp.113-116
    • /
    • 1994
  • InSb thin film magnetic sensor, which have been prepared on glass substrate by vacuum evaporation, is investigated in this paper. The dependance of Hall voltage on magnetic field and temperature is examined by Hall effect. The variation of Hall voltage with magnetic field is almost linear at constant current drive but it is deviated from the linearity at constant voltage drive. Hall voltage decreases as the ambient temperature increases, so it is necessary to take into account the temperature effect when the InSb thin film is used as magnetic sensor.

  • PDF

Innovative Differential Hall Effect Gap Sensor through Comparative Study for Precise Magnetic Levitation Transport System

  • Lee, Sang-Han;Park, Sang-Hui;Park, Se-Hong;Sohn, Yeong-Hoon;Cho, Gyu-Hyeong;Rim, Chun-Taek
    • Journal of Sensor Science and Technology
    • /
    • v.25 no.5
    • /
    • pp.310-319
    • /
    • 2016
  • Three types of gap sensors, a capacitive gap sensor, an eddy current gap sensor, and a Hall effect gap sensor are described and evaluated through experiments for the purpose of precise gap sensing for micrometer scale movement, and a novel type of differential hall effect gap sensor is proposed. Each gap sensor is analyzed in terms of resolution and environment dependency including temperature dependency. Furthermore, a transport system for AMOLED deposition is introduced as a typical application of gap sensors, which are recently receiving considerable attention. Based on the analyses, the proposed differential Hall effect gap sensor is found to be the most suitable gap sensor for precise gap sensing, especially for application to a transport system for AMOLED deposition. The sensor shows resolution of $0.63mV/{\mu}m$ for the overall range of the gap from 0 mm to 2.5 mm, temperature dependency of $3{\mu}m/^{\circ}C$ from $20^{\circ}C$ to $30^{\circ}C$, and a monotonic characteristic for the gap between the sensor and the target.

A Basic Study of Displacement Measurement of Magnetic Bearing System Using Hall Effect Sensor (자기베어링 시스템에서의 변위측정을 위한 홀 효과 센서의 기초 연구)

  • Yang, J.H.;Jeong, G.G.;Jeong, H.H.;Son, S.K.
    • Journal of Power System Engineering
    • /
    • v.11 no.2
    • /
    • pp.72-76
    • /
    • 2007
  • Since the magnetic bearing system has unstability inherently it is necessary to measure the displacement for stable operation. Normally the displacement measurement is implemented by using sensors. The sensor for the displacement measurement is selected by precision, installation space, effect of magnetic field and response speed. And the cost of displacement measurement sensor also is considered. At the cost the hall effect sensor has a large advantage comparing with the others. Therefore this study concern about the basis experimental test for the displacement measurement of the magnetic bearing system that uses the hall effect sensor coupled with a tiny permanent magnet. The experimental results confirm the validity and practicability for this displacement measurement sensor.

  • PDF

Optimal Angle Error Reduction of Magnetic Position Sensor by 3D Finite Element Method

  • Kim, Ki-Chan
    • Journal of Magnetics
    • /
    • v.18 no.4
    • /
    • pp.454-459
    • /
    • 2013
  • This paper deals with an optimal angle error reduction method of magnetic position sensor using hall effect elements. The angle detection simulation for the magnetic position sensor is performed by 3 dimensional finite element method and Taguchi method, one of the design of experiments. The magnetic position sensor is required to generate ideal sine and cosine waveforms from its hall effect elements according to rotation angle for precise angle information. However, the output signals are easy to include harmonics due to uneven magnetic field distribution from permanent magnet in the air-gap in the vicinity of hall effect elements. For the Taguchi method, three design parameters related to position of hall effect elements and shape of back yoke are selected. The characteristics of optimal magnetic position sensor are compared with those of original one in terms of simulation as well as experiment. Finally, the performances of the motor adopting original model and optimal model are represented for the purpose of verification of motor performance due to signals from magnetic position sensor.

A New Velocity Measurement Method using Linear Type Hall-effect Sensor for Electro-mechanical Fin Actuator (선형홀센서를 이용한 전기식 구동장치의 속도 신호 구현)

  • Gu, Jeong-Hoi;Song, Chi-Young
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.59 no.1
    • /
    • pp.70-75
    • /
    • 2010
  • The objective of this paper is to propose a new velocity measurement method for an electro-mechanical fin actuator. The model of the electro-mechanical fin actuator includes uncertainties such as unknown disturbances and parameter variations in flight condition. So, an electro-mechanical fin actuator system needs robust control algorithm which requires not only position information but also velocity information. Usually, analog tachometers have been used for velocity feedback in an electro-mechanical fin actuator. However, using these types of sensors have problems such as the cost, space, and malfunction. These problems lead to propose a new velocity measurement method using linear type Hall-effect sensor. In order to verify the proposed method, several experiments are performed using Model Following Sliding Mode Controller(MFSMC). It is shown that the MFSMC with a new velocity measurement method using linear type Hall-effect sensor can satisfy the requirements without using of velocity sensor.

A Simple Fault Correction Method for Rotor Position Detection of Brushless DC Motor using a Latch Type Hall Effect Sensor

  • Baik In-Cheol;Joo Hyeong-Gil
    • Journal of Power Electronics
    • /
    • v.5 no.1
    • /
    • pp.62-66
    • /
    • 2005
  • A simple fault correction method for rotor position detection of a brushless DC(BLDC) motor with trapezoidal back EMF(electromotive force) using a Hall effect latch unit is presented. The reason why the Hall effect latch unit does not operate properly during the startup of a BLDC motor is thoroughly explained. To solve this problem, a simple code change method and its hardware implementation issues are proposed and discussed.

3D Electromagnetic Analysis of Magnetic Sensor for Improvement of Motor (모터의 성능향상을 위한 마그네틱 센서의 3차원 전자장 해석)

  • Shim, Sang-Oh;Kim, Ki-Chan
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.14 no.5
    • /
    • pp.2381-2387
    • /
    • 2013
  • This paper deals with an optimal angle error reduction method of magnetic hall sensor using hall effect elements with yoke. The magnetic position sensor is required to generate ideal sine and cosine waveforms from its hall effect elements according to rotation angle for precise angle information. However, the output signals are easy to include harmonics due to uneven magnetic field distribution from disturbance in the vicinity of hall effect elements. Thus, The paper studies a way which makes sine and cosine waveforms robust in disturbance and reduces harmonics by installing a yoke around Hall effect elements. The angle detection simulation for the magnetic hall sensor is performed by 3 dimensional finite element method and Taguchi method, one of the design of experiments. For the Taguchi method, three design parameters related to position of hall effect elements and shape of hall effect element yoke are selected.

Position Error Compensation Method of Hall Sensors for Sunroof System using BLDC Motor (선루프용 BLDC 전동기 홀센서 위치 오차 보상 기법)

  • An, Jeong-Yeol
    • The Transactions of the Korean Institute of Electrical Engineers P
    • /
    • v.66 no.2
    • /
    • pp.53-57
    • /
    • 2017
  • This papers propose a Hall-effect sensors position error compensation method in a sunroof system using a BLDC motor with a low-cost MCU. If the BLDC motor is controlled with this wrong position, the torque ripple and operating current can be increased and the average torque also decreases. Generally, sunroof system has characteristics that operate at constant load for several seconds. It is possible to find the minimum operating current value while changing the position of the Hall-effect sensor during the sunroof operation by using these characteristics. Therefore, propose a method to change the Hall-effect sensor position and find the minimum current value. The validity of the proposed algorithm is verified through experiments.

Bluetooth Low-Energy Current Sensor Compensated Using Piecewise Linear Model

  • Shin, Jung-Won
    • Journal of Sensor Science and Technology
    • /
    • v.29 no.5
    • /
    • pp.283-292
    • /
    • 2020
  • Current sensors that use a Hall element and Hall IC to measure the magnetic fields generated in steel silicon core gaps do not distinguish between direct and alternating currents. Thus, they are primarily used to measure direct current (DC) in industrial equipment. Although such sensors can measure the DC when installed in expensive equipment, ascertaining problems becomes difficult if the equipment is set up in an unexposed space. The control box is only opened during scheduled maintenance or when anomalies occur. Therefore, in this paper, a method is proposed for facilitating the safety management and maintenance of equipment when necessary, instead of waiting for anomalies or scheduled maintenance. A Bluetooth 4.0 low-energy current-sensor system based on near-field communication is used, which compensates for the nonlinearity of the current-sensor output signal using a piecewise linear model. The sensor is controlled using its generic attribute profile. Sensor nodes and cell phones used to check the signals obtained from the sensor at 50-A input currents showed an accuracy of ±1%, exhibiting linearity in all communications within the range of 0 to 50 A, with a stable output voltage for each communication segment.

Compensation Method of Position Signal Error with Misaligned Hall-Effect Sensors of BLDC Motor

  • Park, Joon Sung;Choi, Jun-Hyuk;Lee, Ju
    • Journal of Electrical Engineering and Technology
    • /
    • v.11 no.4
    • /
    • pp.889-897
    • /
    • 2016
  • This paper presents an improved approach for compensating rotor position signal displacement in brushless DC (BLDC) motors with misaligned hall-effect sensors. Typically, the hall-effect sensors in BLDC motors are located in each phase and positioned exactly 120 electrical degrees apart. However, limitations in mechanical tolerances make it difficult to place hall-effect sensors at the correct location. In this paper, a position error compensator to counteract the hall-effect sensor positioning error is proposed. The proposed position error compensator uses least squares error analysis to adjust the relative position error and back-EMF information to reduce the absolute offset error. The effectiveness of the proposed approach is verified through several experiments.