• Title/Summary/Keyword: speed-sensorless control

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Vector Control of Induction Motor without Speed Sensor Using a New Reduced-Order Extended Luenberger Observer (새로운 축소 차원 확장 루엔버거 관측기를 이용한 유도 전동기의 센서리스 벡터 제어)

  • Song, Joo-Ho;Lee, Kyo-Beum;Song, Joong-Ho;Choy, Ick;Lim, Myo-Taeg
    • Proceedings of the KIEE Conference
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    • 2000.07b
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    • pp.1105-1107
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    • 2000
  • This paper proposes the new reduced-order extended Luenberger observer and presents the application to sensorless vector control of induction motor. The main features of the proposed observer are discussed and compared with the other observers.

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Sensorless Vector Control of Induction Motors Using a New Reduced-Order Extended Luenberger Observer (새로운 축소 차원 확장 루엔버거 관측기를 이용한 유도 전동기의 센서리스 벡터제어)

  • Lee, Kyo-Beum;Song, Joo-Ho;Song, Joong-Ho;Choy, Ick
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.3
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    • pp.173-179
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    • 2004
  • A synthesis method of the reduced-order extended Luenberger observer (ROELO) and its design procedure for a nonlinear dynamic system are presented. This paper proposes a method to reduce the order of the observer and to ! elect the observer gain matrix. The proposed algorithm is applied for high performance induction motor drives without a speed sensor The simulation and experiment results show that the proposed ROELO provides both rotor flux and rotor speed estimation with good performance.

Parameters Estimation and Torque Monitoring for the Induction Spindle Motor (주축용 유도전동기의 매개변수 추정과 토크 모니터링 시스템)

  • Kwon, Won-Tae;Kim, Gyu-Sik
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.28 no.3
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    • pp.238-244
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    • 2004
  • To monitor the torque of an induction motor using current, the accurate identification of the motor parameters is very important. In this study, the motor parameters such as rotor resistance, stator and rotor leakage inductance, mutual inductance are estimated for torque monitoring and indirect vector control. Estimated parameters are used to monitor the torque of vector controlled induction motor without any speed measuring sensor. Stator current is measured to estimate the magnetizing current which is used to calculate flux linkage, rotor velocity and motor torque. From the experiments, the proposed method shows a good estimation of the motor parameters and torque under the normal rotational speed.

Suction Detection in Left Ventricular Assist System: Data Fusion Approach

  • Park, Seongjin
    • International Journal of Control, Automation, and Systems
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    • v.1 no.3
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    • pp.368-375
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    • 2003
  • Data fusion approach is investigated to avoid suction in the left ventricular assist system (LVAS) using a nonpulsatile pump. LVAS requires careful control of pump speed to support the heart while preventing suction in the left ventricle and providing proper cardiac output at adequate perfusion pressure to the body. Since the implanted sensors are usually unreliable for long-term use, a sensorless approach is adopted to detect suction. The pump model is developed to provide the load coefficient as a necessary signal to the data fusion system without the implanted sensors. The load coefficient of the pump mimics the pulsatility property of the actual pump flow and provides more comparable information than the pump flow after suction occurs. Four signals are generated from the load coefficient as inputs to the data fusion system for suction detection and a neural fuzzy method is implemented to construct the data fusion system. The data fusion approach has a good ability to classify suction status and it can also be used to design a controller for LVAS.

Speed Sensorless Vector Control of a Linear Induction Motor using Stator-Flux Oriented Control Scheme (고정자 자속 기준 제어 기법을 이용한 선형 유도 전동기의 속도 센서리스 벡터제어)

  • 오성철
    • Proceedings of the KIPE Conference
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    • 2000.07a
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    • pp.596-599
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    • 2000
  • 벡터 제어이론은 교류전동기의 토오크와 자속을 독립적으로 제어할 수 있는 특징이 있으므로 토오크 제어를 주로 하는 견인용 전동기의 제어에 적용하기 위한 연구가 활발히 수행되어 왔다 그러나 선형 유도전동기 구동에는 아직 널리 사용되지 않은 실정이다 벡터 제어이론은 일반적으로 회전자자속 기준제어(Rotor flux oriented control)을 의미하며 이를 구현하기 위한 방법은 자속을 직접 측정 혹은 연산하는 직접제어 방식과 속도를 측정하여 슬립주파수 명령을 제어하는 간접방식으로 분류된다. 최근에는 기존의 회전자자속 기준방식뿐만 아니라 고정자자속(Stator flux oriented) 공극자속(Air gap flux oriented) 기준 방식등이 제안되고 있다. 본연구에서는 자기부상열차의 추진용 선형 유도 전동기의 추진에 가장 적합하다고 생각되는 고정자자속 기준벡터제어 방식과 이를 구현하기 위한 고정자 자속을 추정하는 방법에 대하여 설명한다. 또한 속도제어를 위한 속도 추정방식도 안내코일 등 부장치 없이 전동기 파라미터로 추정할 수 있는 기법에 대하여 논한다.

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IPMSM Vector Control using an I/F Initial Operating Method for Drum Washing Machine (I/F 초기 기동 방법을 적용한 드럼세탁기용 IPMSM의 벡터제어)

  • Park, Jin-Ho;Lee, Jung-Hyo;Kim, Kyung-Min;Won, Chung-Yuen
    • Proceedings of the KIPE Conference
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    • 2009.11a
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    • pp.271-273
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    • 2009
  • Because few signals are generated using low resolution position sensor at low speed, rotor position estimation is difficult in drum washing machine application. Besides, inertia of water and drum affect the initial operation load up to two times of rated load. Therefore overcurrent can be occurred at initial operation. In this paper, IPMSM vector control for drum washing machine is proposed by applying I/F initial operating method and sensorless control. And we verify the performance through experiment.

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Initial Rotor Position Detection of Single-phase Permanent Magnet Synchronous Motor using Offset Voltage (옵셋 전압을 이용한 단상 영구자석 동기 전동기의 초기 회전자 위치 검출)

  • Hwang, Seon-Hwan;Seo, Sung-Woo;Jung, Tae-Uk
    • Journal of IKEEE
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    • v.23 no.2
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    • pp.622-627
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    • 2019
  • This paper propose an initial rotor position detection method for sensorless operation of a single-phase permanent magnet synchronous motor(SP-PMSM) with asymmetric air-gap. In general, the sensorless control based on back-emf estimation is difficult to estimate the back-emf at the zero and low speed regions. For this reason, an open loop start-up technique is indispensable, and it is also necessary to detect the initial position of the rotor in order to rotate in a certain direction. In this paper, we propose a method to detect rotor polarity by adding offset voltage to high frequency voltage signal based on the magnetic characteristics of SP-PMSM. The validity and usefulness of the proposed algorithm are verified through several experimental results.

Position Sensorless Cotrol of SRM using Evolutionary Sliding (진화 슬라이딩 모드 관측기를 사용한 SRM의 위치 센서리스 제어)

  • 박진현;박한웅;최영규
    • Journal of the Korean Institute of Intelligent Systems
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    • v.11 no.6
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    • pp.516-523
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    • 2001
  • This paper introduces a indirect rotor position and speed estimation algorithm for the SRM(switched reluctance motor) sensorless control based on the sliding mode observer and evolutionary programming The information of position and speed is generally provided by encoder or resolve. However, the position sensor not only adds complexity, cost and size to the whole drive system, but also causes limitation for industrial applications. In this paper, in order to eliminate the position sensor, indirect position sensing, indirect position sensing method using sliding mode observer is used for SRM drives. But if sliding mode observer parameters are selected to be large, the corresponding rapid changes of estimated position and velocity result in chattering phenomenon. Therefore in order to reduce the chattering, this observer parameters are optimized by evolutionary programming. And PID controller is also optimized to track precisely for the SRM using evolutionary programming.

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Sensorless Control of PMSM using Rotor Position Tracking PI Controller (회전자 위치 추정 PI 제어기를 이용한 PMSM 센서리스 제어)

  • Lee, Jong-Kun;Seok, Jul-Ki;Lee, Dong-Choon
    • Proceedings of the KIEE Conference
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    • 2003.04a
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    • pp.176-178
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    • 2003
  • This paper presents a new velocity estimation strategy of a non-salient permanent magnet synchronous motor(PMSM) 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 has the information of rotor position error. The rotor velocity can be estimated through a rotor position tracking PI controller that controls the position error to aero. For zero and low speed operation, the PI gains of rotor position tracking controller have a variable structure. The PI tuning formulas are derived by analyzing this control system using the frequency domain specifications such as phase margin and bandwidth assignment.

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A Neutral-Voltage-Compensated Sensorless Control of Brushless DC Motor

  • Won, Chang-Hee;Song, Joong-Ho;Ick Choy;Lim, Myo-Taeg
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.3B no.1
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    • pp.59-64
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    • 2003
  • This paper presents a new rotor position estimation method for brushless DC motors. The estimation error of the rotor position clearly provokes the phase shift angle misaligned between the phase current and the back-EMF waveforms, which causes torque ripple in brushless DC motor drives. Such an estimation error can be reduced with the help of the proposed neutral-voltage-based estimation method, which is structured as a closed loop observer. A neutral voltage appearing during the normal mode of the inverter operation is found to be an observable and control table measure, which can be used for estimating an exact rotor position. This neutral voltage is obtained from the DC-link current, the switching logic, and the motor speed values. The proposed algorithm, which can be easily implemented by using a single DC-link current and the motor terminal voltage sensors, is verified by simulation and experiment results.