• Title/Summary/Keyword: Synchronous Position Control

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The Pitch/Turning Control Driver Design Modeling of Permanent Magnet Synchronous Motor (영구자석형 동기전동기의 고저/선회 제어용 드라이버 설계 모델링)

  • Lee, Chun-Gi;Hwang, Jeong-Won;Lee, Joung-Tae;Yang, Bin;Lim, Dong-Keun;Park, Seung-Yub
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.63 no.4
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    • pp.219-225
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    • 2014
  • The purpose of this paper is to control of the low-speed, high-precision PMSM 2-axes pitch/turning. In this paper, apply the PAM-PWM inverter for it. However, The PAM-PWM inverter, control algorithms and hardware is complex. But it is possible to improve the performance in the low-speed operation can reduce the effect of the PWM ripple and Dead Time of inverter by applying suitable DC-bus voltage control. The direct driver PMSM(Permanent Magnet Synchronous Motor) configured to vector control part, PAM control part and the other controller. The vector control part includes PI current, speed control, additional space vector modulation. PAM control part has to have PI voltage controller and P current controller for DC-bus voltage control. Besides, the motor position estimator, the speed estimator and the counter electromotive force and Dead Time Compensation are added. With this arrangement, PMSM was driven with a low pole pitch/turning by performing the current control to the current command or torque command is the paper. As a result, it was possible to minimize the disturbance component that appears in the drive in proportion to the DC voltage magnitude. The use of a hydraulic drive method for a two-axis bubble column is a typical tank. When using the PWM PAM inverter driver is in the turret can be driven by high-precision, low vibration, low noise compared to the hydraulic drive may contribute to the computerization of the turret.

Decoupling of the Secondary Saliencies in Sensorless PMSM Drives using Repetitive Control in the Angle Domain

  • Wu, Chun;Chen, Zhe;Qi, Rong;Kennel, Ralph
    • Journal of Power Electronics
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    • v.16 no.4
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    • pp.1375-1386
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    • 2016
  • To decouple the secondary saliencies in sensorless permanent magnet synchronous machine (PMSM) drives, a repetitive control (RC) in the angle domain is proposed. In this paper, the inductance model of a concentrated windings surface-mounted PMSM (cwSPMSM) with strong secondary saliencies is developed. Due to the secondary saliencies, the estimated position contains harmonic disturbances that are periodic relative to the angular position. Through a transformation from the time domain to the angle domain, these varying frequency disturbances can be treated as constant periodic disturbances. The proposed angle-domain RC is plugged into an existing phase-locked loop (PLL) and utilizes the error of the PLL to generate signals to suppress these periodic disturbances. A stability analysis and parameter design guidelines of the RC are addressed in detail. Finally, the proposed method is carried out on a cwSPMSM drive test-bench. The effectiveness and accuracy are verified by experimental results.

Simple Al Robust Digital Position Control of PMSM using Neural Network Compensator (신경망 보상기를 이용한 PMSM의 간단한 지능형 강인 위치 제어)

  • Ko, Jong-Sun;Youn, Sung-Koo;Lee, Tae-Ho
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.49 no.8
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    • pp.557-564
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    • 2000
  • A very simple control approach using neural network for the robust position control of a Permanent Magnet Synchronous Motor(PMSM) is presented. The linear quadratic controller plus feedforward neural network is employed to obtain the robust PMSM system approximately linearized using field-orientation method for an AC servo. The neural network is trained in on-line phases and this neural network is composed by a feedforward recall and error back-propagation training. Since the total number of nodes are only eight, this system can be easily realized by the general microprocessor. During the normal operation, the input-output response is sampled and the weighting value is trained multi-times by error back-propagation method at each sample period to accommodate the possible variations in the parameters or load torque. In addition, the robustness is also obtained without affecting overall system response. This method is realized by a floating-point Digital Signal Processor DS1102 Board (TMS320C31).

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Synchronous Control of an Asymmetrical Dual Redundant EHA (비대칭 이중화 EHA의 동기 제어)

  • Lee, Seong Ryeol;Hong, Yeh Sun
    • Journal of Drive and Control
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    • v.13 no.2
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    • pp.1-9
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    • 2016
  • In this paper, an elementary force fighting problem was investigated. The problem is encountered when a double-rod type EHA(electro-hydrostatic actuator) is combined with a single-rod type EHA to build a redundant actuator system with synchronized motion. When the rod-side chambers of the two different types of EHAs have the same effective piston areas and are simultaneously pressurized by an external load, the two EHAs behave identically, sharing the external load equally. However, when the piston head-side chamber of the single rod type EHA, having a larger effective area than the rod-side chamber, is pressurized by the external load, an abnormal force fighting between the two EHAs occurs, unless their pump speeds are properly decoupled. In this study, the output drive forces of each EHA were obtained from the cylinder pressure signals and applied to the position control for each EHA to maintain the balance between their pump speeds. Adding minor force difference feedback loops to the position control, the force fighting phenomena could be eliminated and steady state synchronization errors were reduced. The power consumption of the pumps also could be remarkably reduced, avoiding unnecessarily high load pressures to the pumps.

Precision Speed Control of PMSM for Stimulation of the Vestibular System Using Rotatory Chair (전정기관 자극용 회전자극기를 위한 PMSM의 정밀 속도제어)

  • 이태호
    • Proceedings of the KIPE Conference
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    • 2000.07a
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    • pp.628-631
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    • 2000
  • A new control method for precision robust speed control of a PMSM(Permanent Magnet Synchronous Motor) using load torque observer is presented. With this system we can obtain more reliable eye moving singal(nystagmus) Until now rotating chair system which is called 2D-optokinetic stimulator is used to make dizzincess. However an inclined rotating chair system witch is 3D-optokinetic stimulator is needed to obtain the precise dizziness data. This 3D-optokinetic sitimulator include unbalanced load aused by unbalanced center of mass. For this case new compensation method is considered to obtain robust speed control using load torque observer. To reduce the effect of this disturbance we can use dead-beat observer which has high gain. The application of the load torque observer is published in [1] for position control. A problem of using speed information such as amplifying effect of noise is reduce by moving average process. The experimental results are depicted in this paper to show the effect of this proposed algorithm.

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Sensorless Speed Control of PMSM using an Adaptive Sliding Mode Observer (적응 슬라이딩 모드 관측기를 이용한 영구자석 동기전동기의 센서리스 속도제어)

  • Han, Yun-Seok;Kim, Yeong-Seok
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.2
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    • pp.83-91
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    • 2002
  • This paper presents a new speed and position sensorless control method of permanent magnet synchronous motors based on the sliding mode observer. Since the parameter of the dynamic equation such as machine inertia or viscosity friction coefficient are not well known and these values can be easily changed generally during normal operation, there are many restrictions in the actual implementation. The proposed adaptive sliding mode observer applies adaptive scheme so that observer may overcome the problem caused by using the dynamic equation. Furthermore, using the Lyapunov Function, the adaptive sliding mode observer can estimate rotor speed as well as stator resistance. The feasibility of the Proposed observer is verified cia the experiments.

Effects of Parameter Errors on Sensorless Operation of PMSM (영구자석 동기 전동기의 제정수 오차가 센서리스 운전에 미치는 영향)

  • Park, Yong-Soon;Sul, Seung-Ki;Ji, Jun-Keun;Park, Young-Jae;Lee, Dong-Hwan
    • The Transactions of the Korean Institute of Power Electronics
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    • v.16 no.1
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    • pp.71-78
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    • 2011
  • In this paper, the effect of parameter errors to the estimation of the rotor angle in sensorless operation of a permanent magnet synchronous motor is analyzed. The angle error information which is utilized to estimate the rotor position can be classified into two factors, namely, the sign factor and the gain factor. This paper particularly focuses on parameter errors reflected in the sign factor of the angle error information which causes a deviation in the angle estimation. In this paper, mathematical expressions describing the deviation of the angle estimation due to the inductance error and the resistance error in the sensorless control are derived. The validity of the expression is verified by the computer simulations and the experimental results.

Improved Instantaneous Reactive Power Compensator Applied Sensorless Control of IPMSM with Adaptive Back EMF and Current Model Observer (개선된 순시 무효전력 보상기와 함께 적용된 적응 역기전력과 전류 모델 관측기 적용한 돌극형 영구자석 동기 전동기의 센서리스 제어)

  • Lee, Joonmin;Park, Soon-je;Hong, Ju-Hoon;Kim, Woohee;Kim, Young Seok
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.934-935
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    • 2015
  • This paper presents the sensorless control method that employs the adaptive back-EMF(Electromotive Force) and current model observer of interior permanent magnet synchronous motor(IPMSM). The estimated back EMF considering a saliency is obtained by using the adaptive control method. The estimated EMF is inputted to the current model observer which is connected in series with adaptive back EMF estimator and is used to estimate the position and speed of the rotor. In order to improve the shortcomings of conventional method using the current error components multiplied in the compensation constant, the modified instantaneous reactive power compensator is applied. The validity of the control system presented is verified by the simulation.

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Speed Field orient control of permanent magnet linear motor according to determination of system rate. (직선형 영구 자석 동기 모터의 시스템 정격 선정에 따른 속도 제어 특성)

  • Jang, Seok-Myeong;You, Dae-Joon;Jang, Won-Bum;Yang, Moon-Sub
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1273-1275
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    • 2005
  • This paper presents design of speed control system for slot less iron-cored PM linear synchronous motor using space vector PWM. the design must be considered by the useable limits of the DC link voltage and dynamic operating rage as well as the characteristics of design parameters in a point of system. Therefore, in this paper, the permissible operating range of manufactured motor by determination of rate speed and rate thrust according to switching scheme of DC link voltage are offered. The vector control requires information about rotor position. And we can need to the Hall sensor for sampling current. In order to agree with this purpose, Digital Signal Processor(TMS320F240x) developed for implementation of a speed Field Oriented Control.

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Precision Position Control of PMSM Using Neural Network Disturbance observer and Parameter compensator (신경망 외란관측기와 파라미터 보상기를 이용한 PMSM의 정밀 위치제어)

  • 고종선;진달복;이태훈
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.3
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    • pp.188-195
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    • 2004
  • This paper presents neural load torque observer that is used to deadbeat load torque observer and gain compensation by parameter estimator As a result, the response of the PMSM(permanent magnet synchronous motor) follows that nominal plant. The load torque compensation method is composed of a neural deadbeat observer To reduce the noise effect, the post-filter implemented by MA(moving average) process, is adopted. The parameter compensator with RLSM (recursive least square method) parameter estimator is adopted to increase the performance of the load torque observer and main controller The parameter estimator is combined with a high performance neural load torque observer to resolve the problems. The neural network is trained in on-line phases and it is composed by a feed forward recall and error back-propagation training. During the normal operation, the input-output response is sampled and the weighting value is trained multi-times by error back-propagation method at each sample period to accommodate the possible variations in the parameters or load torque. As a result, the proposed control system has a robust and precise system against the load torque and the Parameter variation. A stability and usefulness are verified by computer simulation and experiment.