• Title, Summary, Keyword: permanent magnet position

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Design of the Magnetization System of the Permanent Magnet in Magnetic Sensors (마그네틱 위치 센서용 영구자석의 착자 시스템 설계)

  • Jeong, Seung-Ho;Lee, Chul-Kyu;Kwon, Byung-Il
    • Proceedings of the KIEE Conference
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    • pp.1029-1031
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    • 2005
  • A magnetic position sensor is a apparatus that detect the rotating position by measuring the value of the flux density of the rotating position. In this paper, the magnetization system of the permanent magnet in the magnetic position sensor which detects the rotating position was designed. The permanent magnet was magnetized for the flux density into the hole element to be sinusoidal distribution according to the rotating position. To make the sinusoidal distribution of flux density, the magnetization values according to the position in permanent magnet were varied by adjusting the air gap between the pole of the magnetization fixture and the surface of the permanent magnet.

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Analysis of Detent Force Reduction Method in a Permanent Magnet Linear Synchronous Motor

  • Jang, Seok-Myeong;Yoon, In-Ki;Lee, Sung-Ho;Kang, Do-Hyun;Jeong, Yeon-Ho
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.12B no.1
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    • pp.1-6
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    • 2002
  • The severe problem in improving the positioning precision of a permanent magnet linear synchronous motor (PMLSM) is the large detent farce caused by the permanent magnet arrangement. It is generally an undesired effect that contributes to the torque ripple, vibration and noise of machine. The detent force is arisen from the difference of the position of a permanent magnet end and a tooth position. In this paper, the four methods to reduce detent force were studied and analyzed. The methods are adjusting the width of permanent magnet, varying the shape of armature teeth, relocating the permanent magnet, and adjusting the width of permanent magnet and relocating the permanent magnet at the same time. To analyze the detent farce according to flour methods, a two-dimensional Finite Element Analysis [FEA] was used and we compared with the ratio of reduction of the detent farce according to the flour methods.

A Study on Navigation Sensor System for Outdoor AGV Using AMR Sensors (AMR센서를 이용한 옥외용 AGV 주행센서 시스템에 관한 연구)

  • 김성호;박경섭
    • Journal of Institute of Control, Robotics and Systems
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    • v.9 no.2
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    • pp.140-144
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    • 2003
  • A navigation sensor system for outdoor AGV(Automatic Guided Vehicle) using AMR(Anisotropic Magnetoresitive) sensors is described. We derive a formula of the position of AMR sensor using the measured magnetic field intensity due to permanent magnet with constant distance. The system consists of sensor board. sensor control board and position processing board. The sensor board measures magnetic field intensity, the sensor control board controls the measurement of six sensors sequentially, and the position processing board computes the accurate position of the permanent magnet using Least Square Method. We arranged six sensors at intervals of 30cm and measured the position of the permanent magnet moving at intervals of 30cm. Experimental results showed that we can get standard deviation of 2mm and error of &\pm&4.5mm at a height of 20cm from the permanent magnet.

The Study on the improvement of Characteristics of Permanent Magnet Synchronous Motor for Washing Machine (세탁기용 영구자석 동기전동기의 특성 향상에 관한 연구)

  • Jung, Dae-Sung
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.10
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    • pp.47-53
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    • 2015
  • IPMSM(Insert Permanent Magnet Synchronous Motor) is a very high degree of freedom in the design according to the permanent magnet insertion position. And the performance of IPMSM is affected a lot on barrier shape which determines the magnetic flux path from magnet. Thus the position of permanent magnet and the barrier shape has to be designed by considering both specification and operation condition. In the paper, the permanent magnet and barrier shape which is suitable for direct drive motor of washing machine has been studied. In addition, in order to verify the validity of the study, the test was evaluated by making a prototype motor.

Analysis of the Reduction of Detent Force in a Permanent Magnet Linear Synchronous Motor (영구자석형 선형 동기전동기의 디텐트력 저감방식에 관한 특성해석 및 상호 비교)

  • Jang, S.M.;Yoon, I.K.;Lee, S.H.;Lee, J.H.
    • Proceedings of the KIEE Conference
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    • pp.757-759
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    • 2000
  • The problem in improving the positioning precision of a permanent magnet linear synchronous motor(PMLSM) is the large detent force caused by the permanent magnet. The detent force is thought to arise from the difference of the position of a permanent magnet end and a tooth position. In this paper, Three methods of reducing detent force is presented The first method is adjusting the width of permanent magnet. The second method is varying the shape of armature teeth. The third method is the arrangement of the permanent magnet end. This paper compares with the ratio of reducing the detent force according to the three methods.

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Mathematical Analysis and Simulation Based Survey on Initial Pole Position Estimation of Surface Permanent Magnet Synchronous Motor

  • Kim, Tae-Woong;Wheeler, Patrick;Choi, Jae-Ho
    • Journal of Power Electronics
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    • v.9 no.3
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    • pp.499-506
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    • 2009
  • In this paper, the initial pole-position estimation of a surface (non-salient) permanent magnet synchronous motor is mathematically analyzed and surveyed on the basis of simulation analysis, and developed for accurate servo motor drive. This algorithm is well carried out under the full closed-loop position control without any pole sensors and is completely insensitive to any motor parameters. This estimation is based on the principle that the initial pole-position is simply calculated by the reverse trigonometric function using the two feedback currents in the full closed-loop position control. The proposed algorithm consists of the predefined reference position profile, the information of feedback currents, speed, and relative position, and the reverse trigonometric function for the initial-pole position estimation. Comparing with the existing researches, the mathematical analysis is introduced to get a more accurate initial pole-position of the surface permanent magnet motor under the closed-loop position control. It is found that the proposed algorithm can be easily applied in servo drive applications because it satisfies the following user's specifications; accuracy and moving distance.

Design of Rotary Magnetic Position Sensor with Sinusoidally Magnetized Permanent Magnet (정현적으로 착자된 영구자석을 갖는 마그네틱 위치센서 설계)

  • Jeong, Seung-Ho;Rhyu, Se-Hyun;Kwon, Byung-Il
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.3
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    • pp.506-513
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    • 2007
  • This paper proposes a rotary magnetic position sensor which has a sinusoidally magnetized permanent magnet with a small number of poles. To make the sinusoidal magnetic flux density distribution from the permanent magnet, a magnetizing future is optimized by the DOE(Design of Experiments) method. The magnetization process is analyzed using the Preisach model and 2 dimensional finite element method. The magnetic flux density distribution from the magnetized permanent magnet is very similar to ideal sine wave. The simulation result of the magnetic flux density distribution is compared with the experimental one. Also the availability of the proposed rotary type magnetic position sensor is confirmed by position calculation technique.

MRAS Based Sensorless Speed Control of Permanent Magnet Synchronous Motor (MRAS에 의한 영구자석 동기전동기의 센서리스 속도제어)

  • 김영삼;권영안
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.52 no.11
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    • pp.541-547
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    • 2003
  • Speed and torque controls of permanent magnet synchronous motors are usually attained by the application of position and speed sensors. However, speed and position sensors require the additional mounting space, reduce the reliability in harsh environments and increase the cost of a motor. Therefore, many studies have been peformed for the elimination of speed and position sensors. This paper investigates a novel speed sensorless control of a permanent magnet synchronous motor. The proposed control strategy is based on the MRAS(Model Reference Adaptive System) using the state observer model with the current error feedback and the magnet flux model as two models for the back-emf estimation. The proposed algorithm is verified through the simulation and experiment.

Current-Sensorless Maximum Torque per Ampere Control for a Surface Mounted Permanent Magnet Synchronous Motor with Low-Resolution Position Sensor (저분해능 위치센서를 갖는 표면부착형 영구자석 동기전동기의 전류센서 없는 단위 전류 당 최대 토크 제어)

  • Lee, Kwang-Woon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.14 no.3
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    • pp.204-210
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    • 2009
  • This paper proposes a novel current-sensorless maximum torque per ampere control for a surface mounted permanent magnet synchronous motor with low-resolution position sensor. A direct axis current is estimated from the mathematical model of the permanent magnet synchronous motor and the phase angle between direct and quadrature axis voltage commands is controlled to adjust the estimated direct axis current to zero, thus a maximum torque per ampere control can be achieved. The proposed method is suitable for low cost applications with slow dynamic response characteristics.

Sensorless Control of Non-salient Permanent Magnet Synchronous Motor Drives using Rotor Position Tracking PI Controller

  • Lee Jong-Kun;Seok Jul-Ki
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.5B no.2
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    • pp.189-195
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    • 2005
  • This paper presents a new velocity estimation strategy for a non-salient permanent magnet synchronous motor drive without high frequency signal injection or special PWM pattern. This approach is based on the d-axis current regulator output voltage of the drive system, which contains the rotor position error information. The rotor velocity can be estimated through a rotor position tracking PI controller that controls the position error at zero. For zero and low speed operation, the PI gain of the rotor position tracking controller has a variable structure according to the estimated rotor velocity. Then, at zero speed, the rotor position and velocity have sluggish dynamics because the varying gains are very low in this region. In order to boost the bandwidth of the PI controller during zero speed, the loop recovery technique is applied to the control system. The PI tuning formulas are also derived by analyzing this control system by frequency domain specifications such as phase margin and bandwidth assignment.