• Title/Summary/Keyword: Eccentric Rotor

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A Study on the Prevention of Cracks on the Trepan Area of Motor Bearing

  • Lee, Kyung-Won;Ban, Jae-Sam;Kang, Heyong-Seon;Cho, Kyu-Zong
    • Journal of Mechanical Science and Technology
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    • v.17 no.2
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    • pp.215-220
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    • 2003
  • Trepan prevents the wear of the inside part of a bearing when the initial shaft rotates. It continuously contacts with the eccentric part of the shaft in rotation and is loaded repeatedly. Therefore, even if an early crack of a trepan part is small, the crack may progress by the repeated load. If the crack progresses, very small chips come out. This Is put in the rotor and prevents the rotation of the compressor, There can be leaks in a microgroove and extreme wear can occur due to lack of oil on the surface contact part. Therefore, this study was carried out to compare and investigate the trepan strength and deflection characteristics between trepan locations and dimension changes using the finite element method and search a motor bearing for a model with bigger stiffness of a trepan part and the same deflection.

RVDT Phase Error Compensation for Absolute Displacement Measurement (절대 변위 측정용 RVDT의 위상 오차 보상)

  • Shin Dong-Yun;Yang Yoon-Gi;Lee Chang-Su
    • Journal of Institute of Control, Robotics and Systems
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    • v.12 no.7
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    • pp.658-665
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    • 2006
  • RVDT is a transducer that presents rotary phase angle according to the displacement of eccentric rotor such as press machine. However a study on the phase error of RVDT that affects precision is not enough. This paper analyzes RVDT phase error and obtains compensation curves with serial or parallel resistance through simulation. First, error compensation procedure that analyses errors due to the unbalance of reference inductances of each pole and uses parallel resistance as a compensation is proposed. Second, error compensation procedure due to the amplitude unbalance of the sensor driving currents is examined by serial compensation resistance. Experimentally, we got stable RVDT with phase error under $1^{\circ}$ by the proposed method.

TREPAN SHAPE MODIFICATION OF MOTOR BEARING (모터 베어링의 트레판 형상 수정에 관한 연구)

  • 이경원;반재삼;강형선;조규종
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.950-953
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    • 2002
  • Trepan prevents wear of an inside part of a bearing when the initial shaft rotates. It continuously contacts with the eccentric part of the shaft in rotation and is loaded repeatedly. Therefore, even if an early crack of a trepan part is small, a crack progresses by a repeated load. If a crack progresses, very small chips come out. This is pill in the rotor and prevents rotation of the compressor. There can be leaks in a microgroove and extreme wear can occur due to lack of oil on the surface contact pan. Therefore, this study was carried out to compare and investigate trepan strength and deflection characteristics between trepan locations and dimension changes using a finite element method and search a motor bearing for a model with bigger stiffness of a trepan part and the same deflection. And then. five different types of the oil groove model were chosen to prevent small crack and considered also machining ability and the analysis was carried out on oil feeding flow.

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Dynamical behavior of the eccentric rotor system using mathematical modeling (동역학적 모델링을 통한 편심 회전체의 거동 해석)

  • 조문갑;조용구;김동원;이정윤;오재응
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.05a
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    • pp.313-318
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    • 2003
  • The vibration of washing machine at spinning cycle is important problem that affects the performance of a product. In this raper, the inner structure of the washing machine is modeled as a rigid body suspension system and transfer farce caused by rotating unbalance mass is obtained using Newton's the 2nd law. and this model is used to predict the verge of walking instability during the spinning cycle. The walk of the drum washing machine is suggested by calculating the force transmissibility between drum and the cabinet. As calculating the resultant force exerted for cabinet, the friction coefficient of the pad is suggested to avoid the walk. In addition, relation between translational slip and rotational slip is derived and method to avoid the rotational slip is introduced.

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Proportional Resonant Feedforward Contrl Algorithm for Speed Ripple Reduction of 3-phase SPMSM (3상 영구자석 동기전동기의 속도 맥동 저감을 위한 비례공진 전향보상 제어 알고리즘)

  • Lee, Seon-Yeong;Hwang, Seon-Hwan;Kim, Gyung-Yub;Park, Jong-Won
    • Journal of IKEEE
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    • v.24 no.4
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    • pp.1104-1108
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    • 2020
  • This paper propose a variable proportional resonant feedforward algorithm for reducing the speed ripple of a three-phase permanent magnet synchronous motor. In general, the torque ripples can be generated by electrical pulsation due to current measurement errors and dead time and mechanical pulsation because of rotor eccentricity and eccentric load. These torque pulsations can cause speed pulsations of the motor and degrade the operating performance of the motor drive system. Therefore, in this paper, the factors of the speed ripple is analyzed and an algorithm to reduce the speed ripple is proposed. The proposed algorithm applied a variable proportional resonant controller in order to reduce the specific operating frequency included in the speed pulsation, and utilized a feedforward compensation controller structure to perform the compensation operation. The proposed algorithm is verified through various experiments.