• Title/Summary/Keyword: 루엔버거 관측기

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Speed Sensorless Stator Flux-Oriented Control of Induction Motor in the Field Weakening Region Using Luenberger Observer (루엔버거 관측기를 이용한 약계자 영역에서 유도전동기의 속도 센서리스 고정자자속 기준제어)

  • Kuen Tae-Sung;Shin Myoung-Ho;Hyun Dong-Seok
    • Proceedings of the KIPE Conference
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    • 2002.11a
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    • pp.3-6
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    • 2002
  • In a conventional speed sensorless stator flux-oriented(SFO) induction motor drive system, when the estimated speed is transformed into the sample-data model using the first-forward difference approximation, the sampled data model has a modeling error which, in turn, produces an error in the rotor speed estimation. The error included in the estimated speed is removed by the use of a low pass filter (LPF). As the result, the delay of the estimated speed occurs in transients by the use of the LPF This paper investigates the problem of a conventional speed sensorless SFO system due to the delay of estimated speed in the filed weakening region. In addition, this paper proposes a method to estimate exactly speed by using Luenberger observer, The proposed method is verified by experiment with a 5-hp induction motor drive.

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Position Control of an Electro-hydraulic Servo System with Sliding Mode (전기유압 서보시스템의 슬라이딩 모드 위치제어)

  • Huh, Jun Young
    • Journal of Drive and Control
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    • v.18 no.3
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    • pp.16-22
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    • 2021
  • The variable structure controller has the characteristic that while in sliding mode, the system moves along the switching plane in the vicinity of the switching plane, so it is robust to the parameter fluctuations of the plant. However, a controller based on a variable structure may not meet the desired performance when it is commanded to track any input or exposed to disturbances. To solve this problem, a sliding mode controller based on the IVSC approach excluding an integrator is proposed in this study. The proposed sliding mode control was applied to the position control of a hydraulic cylinder piston. The sliding plane was determined by the pole placement and the control input was designed to ensure the existence of the sliding mode. The feasibility of the modeling and controller was reviewed by comparing it with a conventional proportional control through computer simulation using MATLAB software and experiment in the presence of significant plant parameter fluctuations and disturbances.

Speed Sensorless Stator Flux-Oriented Control of Induction Motor In the Field Weakening Region Using Luenberger Observer (약계자영역에서 루엔버기관측기를 이용한 유도전동기의 속도 센서리스 고정자자속 기준제어)

  • 권태성;신명호;현동석
    • The Transactions of the Korean Institute of Power Electronics
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    • v.8 no.5
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    • pp.375-380
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    • 2003
  • In a conventional speed sensorless stator flux-oriented (SFO) induction motor drive, when the estimated speed is transformed into the sample-data model using the first-forward difference approximation, the sampled data model has a modeling error which, in turn, produces an error in the rotor speed estimation. The error is removed by the use of a low pass filter (LPF). As a result, the delay of the estimated speed occurs in transients by the use of the LPF. This paper proposes a method to estimate exactly the speed by using Luenberger observer to solve the problem of a conventional method.

Position Controller Implementation Using the Fractional Order Derivative (유리차수 미분을 이용한 위치제어기 구현)

  • Kang, Jung-Yoog;Jeon, Yong-Ho
    • The Journal of the Korea institute of electronic communication sciences
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    • v.14 no.1
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    • pp.185-190
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    • 2019
  • This study aims to apply the mathematical method of fractional order derivatives to the controller that controls the system response. In general, the Laplace transform of the PID controller has an exponent of the integer order of s. The derivative of the fractional order has a fractional exponent of s when it is transformed by Laplace transform. Therefore, this controller proposes a design method with the result of discrete time conversion. Because controllers with fractional exponents of s are not easy to design. This controller is applied to a standard secondary system and its performance is examined. Then, it applies to solenoid valve which is widely used in industrial field. A Luenberger's observer was designed to estimate the disturbance state and the observed state was applied to the fractional order controller. As a result, uniform and precise control performance was obtained. It was confirmed that the position error of the steady state is within 0.1 [%] and the rising time is within about 0.03 [s].