• Title/Summary/Keyword: current sensorless

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A Sensorless Vector Control System for Induction Motors Using Stator Current Difference

  • Park, Chul-Woo;Choi, Byeong-Tae;Kwon, Woo-Hyen;Ku, Bon-Ho;Youn, Kyung-Sub
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.139.4-139
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    • 2001
  • The thesis propose the sensorless vector control method that estimates the rotor speed using stator current. The estimated speed is used as feedback in a vector control system. The conventional MRAS structure has a problem the error output is decreasing as estimated speed error is increasing and the estimation performance is not robust when mutual inductance has been changed. In the proposed method, error output is proportional to estimated speed error. The described technique is less complex, robust to variations of mutual inductance. This new method can achieve much wider bandwidth speed control than that of the conventional MRAS structure.

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Speed Sensorless Torque Monitoring of Induction Spindle Motor using Graphic programming (그래픽 프로그래밍 기법을 주축용 유도전동기의 속도 센서리스 토크감시)

  • 박진우;홍익준;권원태
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.10a
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    • pp.319-322
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    • 1997
  • In vector control technique, stator currents of an induction motor are transformed to equivalent d-q currents in reference frame consist of d and q axis, each of which is coincide with flux and torque direction respectively. In this paper, the new algorithm is suggested where the stator current through an induction motor torque is monitored by using a vector control method where an additional equipment is not need. The G-programming is used to apply the suggested algorithm in the experiment and this is applied to an actual system to monitor the torque value of an induction motor on real time. To solve the vibration trouble of estimated torque caused from an unbalanced real rotating speed of an induction motor and measured rotating speed by suggesting the reconstructed in a method based on measurement current signal. This produced system testifies an accuracy of an induction motor through the experiment by comparing the reference value of the control method.

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A NEW ALALYTICAL MODEL AND SENSORLESS APPROACH FOR SWITCHED RELUCTANCE MOTORS

  • Saha, S.;Kosaka, T.;Matsui, N.;Takeda, Y.
    • Proceedings of the KIPE Conference
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    • 1998.10a
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    • pp.310-315
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    • 1998
  • In this paper a new analytical model for the non-linear flux-linkage/current characteristics of the switched reluctance motors at different rotor positions is proposed. The model has been successfully verified by the simulation and the experimental results of the instantaneous current waveforms and the average torque values in both single pulse and multiple pulse operation of the motor. The uniqueness of the model lies in its defining a simple algorithm for determining the rotor position ($\theta$). Hence, sensorless operation of the motor can be easily implemented with the aid of this model.

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Improved Flux Estimation Method for Speed Sensorless Control of Induction (개선된 자속추정 방식에 의한 유도전동기의 속도 센서리스 제어)

  • Seo, Young-Su;Joe, Moon-Taek;Kim, Young-Chun;Kim, Jin-Taek
    • Proceedings of the KIEE Conference
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    • 1998.07f
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    • pp.2005-2007
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    • 1998
  • The rotor speed flux information most important in the speed sensorless vector c So in the paper used current voltage model for flux information in a induction motor. Voltage realized low pass filter insted of integrator, c model realized used of current equation. And cur voltage model estimated flux compoed of Pl cont For conpensation of estimated flux error conpansation algorithm using exactly, rapidly flux obtained for conpensation of estimated flux Proposed control system used TMS320C31 DS high speed processing. The effectiveness of proposed method is verified by simulation experimental results. This method shows h characteristic speed estimation highly flux esti and stable, robust character of load regulation.

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Sensorless Vector Control of Induction Motor using Sliding Observer (슬라이딩 관측기를 이용한 유도전동기의 센서리스 벡터제어)

  • Park, J.H.;Kim, G.H.;Cho, Y.K.;Kim, C.S.;Woo, J.I.
    • Proceedings of the KIEE Conference
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    • 1998.07f
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    • pp.1922-1924
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    • 1998
  • In this paper, the robust vector control method of Induction Motor for the purpose of improving the system performance deterioration caused by parameter variations is proposed. The full order state observer estimates the stator current and the rotor flux by using the state prediction of state variables. And, the motor speed is estimated without speed sensor using the full order state observer. Also, the parameter variation is compensate by the Sliding Observer. By using this method, speed sensorless control and current contol with no affection of the parameter variation can be obtained simultaneously.

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The position detecting method in SRM using pattern of phase current (SRM의 상전류 패턴을 이용한 회전자 위치 검출기법)

  • Kim, Tae-Hyoung;Lee, Dong-Hee;Ahn, Jin-Woo
    • Proceedings of the KIPE Conference
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    • 2005.07a
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    • pp.558-561
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    • 2005
  • This paper describes a novel method of detecting excitation position in switched reluctance motor(SRM) drive. Some strategies of position sensorless control methods for the motor include the measurement of phase current and applied pulse voltage in an unexcited phase is suggested. The principle of the estimation of a rotor position is based on the detection of inductance by pulse currents. This sensorless method is very simple to detect excitation position estimation and gives efficient control of drive system. Suggested method is verified by some simulations.

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Design of a Fuzzy-Sliding Observer for Control of DC Servo Motor (직류 서보 전동기 제어를 위한 퍼지-슬라이딩 관측기 설계)

  • 고봉운;김낙교
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.53 no.5
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    • pp.338-344
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    • 2004
  • This paper presents a sensorless speed control of a DC servo motor using a fuzzy-sliding observer in the presences of load disturbances. A fuzzy-sliding observer is proposed in order to estimate the speed of a motor rotor. First, a sliding observer is used to estimate the derivative of the armature current directly using the armature current mesured in the DC servo motor. Second, the optimal gain of the Luenberger observer is set up using the fuzzy control. Experimental results show the good performance in the DC servo motor system with the proposed fuzzy-sliding observer.

Performance Improvement of the Linear BLDC Generator in a NASA Deep Space Explorer

  • Lee, Hyung-Woo
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.4B no.3
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    • pp.108-113
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    • 2004
  • This paper presents methods to improve performance of the power supply system in a NASA deep space explorer. In the Stirling engine driven reciprocating Brushless DC (BLDC) generator, the accurate position information of the prime mover is important to diagnose the performance of the engine and prevent distortion of the output power. Since sensors to detect the position are fragile and unreliable, and conventional sensorless techniques have drawbacks in the low speed region, a novel sensorless position detection technique for the prime mover has been proposed and verified. Another major issue of the generator for the spacecraft is power density maximization. The mass of the power system is important to the mass of the satellite. Therefore, the components of the spacecraft should be lightweight. Conventional rectification methods cannot achieve the maximum power possible due to non-optimal current waveforms. The optimal current waveform for maximizing power density and minimizing machine size and weight in a nonsinusoidal power supply system has been derived, incorporated in a control system, and verified by simulation work.

Sensorless Control of SRM using Inductance Estimation Thechnique (인덕턴스 추론기법에 의한 SRM의 센서리스 제어)

  • Moon, J.W.;Park, S.J.;Ahn, J.W.;Kim, C.U.;Hwang, Y.M.
    • Proceedings of the KIEE Conference
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    • 2001.10a
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    • pp.137-139
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    • 2001
  • This paper describes a new methods of detecting rotor position in SRM(switched reluctance motor). The Conventional method of position sensorless control for SRM is measuring phase current and pulse voltage applied in unexcited phase. The estimation of rotor position based on the detection of inductance by pulse current. Implementation is via low-cost electronic circuits with DSP320F241. Test results show that this technique is a possible approach to detect the rotor position of an SRM.

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IPMSM Position Sensorless Control Method Comparison for Hybrid Vechicle (하이브리드 자동차용 IPMSM에 적용할 위치센서리스 제어기법 비교)

  • Park, Sang-Zoon;Lee, Yong-Kyun;Lee, Ju-Suk;Mok, Hyung-Soo
    • Proceedings of the KIPE Conference
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    • 2010.11a
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    • pp.314-315
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    • 2010
  • This paper results from the application of IPM for hybrid vehicles using Matsui method and Extended EMF mothed. These 2 methods are typical methods based on EMF, which is usually used in position sensorless control. When d-axle current was 0, both Matsui method and Extended EMF method showed desirable results. On the other hand, when d-axle current was not 0, only Extended EMF appeared satisfactory. This means that Matsui method is more vulnerable to parameter variation. Thus, Extended EMF method would be better than Matsui method to be used in field weaking or MTPA control.

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