• Title/Summary/Keyword: Torque Estimator

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Least Order Load Torque.Inertia Observer for Low Speed Drive of Motor Using (전동기 극저속 운전을 위한 최소차원 부하토크.관성 관측기)

  • Kim Young-Chun;Kim Eun-Gi;Cho Moon-Taek
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.7 no.4
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    • pp.575-579
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    • 2006
  • In this paper, an instantaneous speed observer with a reduced order is proposed to implement an indirect control for a motor with excellent dynamic stability and performance in a very low speed region. The proposed observer can estimate the instantaneous speed in very low speed region and simplify the system configuration by adopting an least order load torque-inertia observer to estimate the load torque and the motor speed. Simulation are carried out to illustrate the performance of the proposed estimator at very low speed.

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An Instrument Fault Diagnosis Scheme for Direct Torque Controlled Induction Motor Driven Servo Systems (직접토크제어 유도전동기 구동 서보시스템을 위한 장치고장 진단 기법)

  • Lee, Kee-Sang;Ryu , Ji-Su
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.51 no.6
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    • pp.241-251
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    • 2002
  • The effect of sensor faults in direct torque control(DTC) based induction motor drives is analyzed and a new Instrument fault detection isolation scheme(IFDIS) is proposed. The proposed IFDIS, which operated in real-time, detects and isolates the incipient fault(s) of speed sensor and current sensors that provide the feedback information. The scheme consists of an adaptive gain scheduling observer as a residual generator and a special sequential test logic unit. The observer provides not only the estimate of stator flux, a key variable in DTC system, but also the estimates of stator current and rotor speed that are useful for fault detection. With the test logic, the IFDIS has the functionality of fault isolation that only multiple estimator based IFDIS schemes can have. Simulation results for various type of sensor faults show the detection and isolation performance of the IFDIS and the applicability of this scheme to fault tolerant control system design.

A Speed Sensorless SPMSM Position Control System with Direct Torque Control (직접 토크제어에 의한 속도검출기 없는 SPMSM의 속도 제어 시스템)

  • Kim, Min-Ho;Kim, Nam-Hun;Kim, Dong-Hee;Kim, Min-Huei
    • Proceedings of the KIEE Conference
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    • 2001.04a
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    • pp.277-280
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    • 2001
  • This paper presents a speed sensorless implementation of digital speed control system of Surface Permanent-Magnet Synchronous Motor(SPMSM) drives with a direct torque control(DTC). The system presented are stator flux and torque observer of stator flux feedback control model that inputs are current and voltage sensing of motor terminal with estimated rotor angle for a low speed operating area, two hysteresis band controllers, an optimal switching look-up table, rotor speed estimator, and IGBT voltage source inverter by using fully integrated control software. The developed speed sensorless control system are shown a good motion control response characteristic results and high performance features using 1.0Kw purposed servo drive SPMSM.

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Low Speed Drive of Motor Using Least Order Load $Torque{\cdot}Inertia$ Observer (최소차원 토크${\cdot}$관성 관측기를 이용한 전동기 극저속 운전)

  • Kim, Eun-Gi;Jeon, Kee-Young;Oh, Bong-Hwan;Chung, Choon-Byeong;Lee, Hoon-Goo;Kim, Yong-Joo;Seo, Young-Soo;Han, Kyung-Hee
    • Proceedings of the KIPE Conference
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    • 2005.07a
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    • pp.234-236
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    • 2005
  • In this paper, an instantaneous speed observer with a reduced order is proposed to implement an indirect control for an motor with excellent dynamic stability and performance in a very low speed region. The proposed observer can estimate the instantaneous speed in very low speed region and simplify the system configuration by adopting a least order load torque-inertia observer to estimate the load torque and the rotor speed. Simulation are carried out to illustrate the performance of the proposed estimator at very low speed.

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A Sensorless Position Control System of SPMSM with Direct Torque Control (직접 토크제어에 의한 센서리스 SPMSM의 위치 제어 시스템)

  • Kim Min-Ho;Kim Nam-Hun;Kim Dong-Hee;Kim Min-Huei;Hwang Don-Ha
    • Proceedings of the KIPE Conference
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    • 2001.07a
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    • pp.397-400
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    • 2001
  • This paper presents a implementation of digital sensorless position control system of surface permanent-magnet synchronous motor (SPMSM) drive with a direct torque control (DTC). The system are stator flux and torque observer of stator flux feedback control model that inputs are current and voltage sensing of motor terminal with estimated rotor angle for a low speed operating area, two hysteresis band controllers, an optimal switching look-up table, rotor speed estimator, and IGBT voltage source inverter by using fully integrated control software. The developed sensorless control system are shown a good motion control response characteristic results and high performance features using 1.0 (kW) purposed servo drive SPMSM.

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Sensorless Fuzzy Direct Torque Control for High Performance Electric Vehicle with Four In-Wheel Motors

  • Sekour, M'hamed;Hartani, Kada;Draou, Azeddine;Allali, Ahmed
    • Journal of Electrical Engineering and Technology
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    • v.8 no.3
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    • pp.530-543
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    • 2013
  • This paper describes a control scheme of speed sensorless fuzzy direct torque control (FDTC) of permanent magnet synchronous motor for electric vehicle (EV). Electric vehicle requires fast torque response and high efficiency of the drive. Speed sensorless FDTC In-wheel PMSM drives without mechanical speed sensors at the motor shaft have the attractions of low cost, quick response and high reliability in electric vehicle application. This paper presents a new approach to estimate the speed of in-wheel electrical vehicles based on Model Reference Adaptive System (MRAS). The direct torque control suffers in low speeds due to the effect of changes in stator resistance on the flux measurements. To improve the system performance at low speeds, a PI-fuzzy resistance estimator is proposed to eliminate the error due to changes in stator resistance. High performance sensorless drive of the in-wheel motor based on MRAS with on line stator resistance tuning is established for four motorized wheels electric vehicle and the whole system is simulated by matalb/simulink. The simulation results show the effectiveness of the new control strategy. This proposed control strategy is extensively used in electric vehicle application.

Nonlinear and Adaptive Back-Stepping Speed Control of IPMSM (IPMSM의 비선형 적응 백스텝핑 속도 제어)

  • Jeon, Yong-Ho;Jung, Seung-Hwan;Choy, Ick;Cho, Whang
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.1
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    • pp.18-25
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    • 2013
  • In this paper, a nonlinear controller based on adaptive back-stepping method is proposed for high performance operation of Interior Permanent Magnet Synchronous Motor (IPMSM). First, in order to improve the performance of speed tracking, a nonlinear back-stepping controller is designed. In addition, since it is difficult to achieve the high quality control performance without considering parameter variation, a parameter estimator is included to adapt to the variation of load torque in real time. Finally, for the efficiency of power consumption of the motor, controller is designed to operate motor with the minimum current for the required maximum torque. The proposed controller is tested through experiment with a 1-hp Interior Permanent Magnet Synchronous Motor (IPMSM) for the angular velocity reference tracking performance and load torque volatility estimation, and to test the Maximum Torque per Ampere (MTPA) operation. The result verifies the efficacy of the proposed controller.

Nonlinear and Adaptive Back-Stepping Speed Control of IPMSM (IPMSM 전동기의 비선형 적응 백스텝핑 속도 제어)

  • Jeon, Yong-Ho;Cho, Whang
    • The Journal of the Korea institute of electronic communication sciences
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    • v.6 no.6
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    • pp.855-864
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    • 2011
  • In this paper, a nonlinear controller based on adaptive back-stepping method is proposed for high performance operation of IPMSM(Interior Permanent Magnet Synchronous Motor). First, in order to improve the performance of speed tracking a nonlinear back-stepping controller is designed. Since it is difficult to control the high performance driving without considering parameter variation, a parameter estimator is included to adapt to the variation of load torque in real time. In addition, for the efficiency of power consumption of the motor, controller is designed to operate motor with minimum current for maximum torque. The proposed controller is applied through simulation to the a 2-hp IPMSM for the angular velocity reference tracking performance and load torque volatility estimation, and to test the MTPA(Maximum Torque per Ampere) operation in constant torque operation region. The result verifies the efficacy of the proposed controller.

A Motion Control System of Reluctance Synchronous Motor with Direct Torque Control (직접 토크제어에 의한 리럭턴스 동기전동기의 위치제어 시스템)

  • Kim Min-Huei;Kim Nam-Hun;Choi Kyeong-Ho;Kim Dong-Hee;Lee Sang-Ho;Hwang Don-Ha
    • Proceedings of the KIPE Conference
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    • 2001.12a
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    • pp.23-26
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    • 2001
  • This paper presents a digital motion control system for Reluctance Synchronous Motor (RSM) drives with direct torque control (DTC). The system consists of stator flux observer, torque estimator: two hysteresis band controllers, an optimal switching look-up table, IGBT voltage source inverter(VSI), and TMS320C31 DSP controller by using fully integrated control software. The stator flux observer is based on the combined voltage and current model with stator flux feedback adaptive control of which inputs are current, voltage and actual rotor angle for wide speed range. In order to prove the suggested motion control algorithm, There are some simulation and testing at actual experimental system. The developed digitally high-performance motion control system are shown a good motion control response characteristic results and high performance features using 1.0Kw RSM.

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A High-Performance Motion Control System of Reluctance Synchronous Motor with Direct Torque Control (직접토크제어에 의한 리럭턴스 동기전동기의 고성능 위치제어 시스템)

  • Kim, Min-Hoe;Kim, Nam-Hun;Choe, Gyeong-Ho
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.3
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    • pp.150-157
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    • 2002
  • This paper presents preliminarily an implementation of digital high-performance motion control system of Reluctance Synchronous Motor (RSM) drives with direct torque control (DTC). The system consist of stator flux observer, torque estimator, two hysteresis band controllers, an optimal switching look-up table, IGBT voltage source inverter, and TMS320F240 DSP controller made by Texas Instruments. The stator fluff observer is based on the combined voltage and current model with stator flux feedback adaptive control, and the input of the observer are the stator voltage and current of motor terminal for wide speed range. The rotor position and speed sensor used 6000 pulse/rev encoder. In order to prove rightness of the suggested control algorithm, we have some simulation and actual experimental system at $\pm$20 and $\pm$2000 rpm. The developed digitally high-performance motion control system+ are shown a good response characteristic of control results and high performance features using 1.0kW RSM which has 2.57 Ld/Lq salient ratio.