• Title/Summary/Keyword: sensorless

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IPMSM Sensorless Control Using Square-Wave-Type Voltage Injection Method with a Simplified Signal Processing (구형파 신호 주입을 이용한 IPMSM 센서리스 제어에서 개선된 신호처리 기법)

  • Park, Nae-Chun;Kim, Sang-Hoon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.3
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    • pp.225-231
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    • 2013
  • This paper presents an improved signal processing technique in the square-wave-type voltage injection method for IPMSM sensorless drives. Since the sensorless method based on the square-wave voltage injection does not use low-pass filters to get an error signal for estimating rotor position and allows the frequency of the injected voltage signal to be high, the sensorless drive system may achieve an enhanced control bandwidth and reduced acoustic noise. However, this sensorless method still requires low-pass and band-pass filters to extract the fundamental component current and the injected frequency component current from the motor current, respectively. In this paper, these filters are replaced by simple arithmetic operations so that the time delay for estimating the rotor position can be effectively reduced to only one current sampling. Hence, the proposed technique can simplify its whole signal process for the IPMSM sensorless control using the square-wave-type voltage injection. The proposed technique is verified by the experiment on the 800W IPMSM drive system.

A Robust Sensorless speed control of Sensorless BLDC Motor (센서리스 BLDC 전동기의 강인한 속도 제어)

  • Kim, Jong-Seon
    • The Journal of the Korea institute of electronic communication sciences
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    • v.3 no.4
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    • pp.266-275
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    • 2008
  • The sensorless speed control technique for BLDC motor using digital IP control is proposed in this paper for advanced speed characteristic which is robust to motor parameters and load variations. The sensorless drive of BLDC motor using terminal voltages is affected by load or speed because it uses analog filters to estimate the rotor position. For this reason, the robust speed controller with the accurate rotor position estimator is needed for sensorless control which is robust to load and insensitive to motor parameters. The constant speed robust to load variation and the stable sensorless control of BLDC motor robust to the increase or decrease of speed with constant load is implemented using digital IP control in this paper. The validity to these is established with experimentation.

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A Novel High-Performance Strategy for A Sensorless AC Motor Drive

  • Lee, Dong-Hee;Kwon, Young-Ahn
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.2B no.3
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    • pp.81-89
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    • 2002
  • The sensorless AC motor drive is a popular topic of study due to the cost and reliability of speed and position sensors. Most sensorless algorithms are based on the mathematical modeling of motors including electrical variables such as phase current and voltage. Therefore, the accuracy of such variables largely affects the performance of the sensorless AC motor drive. However, the output voltage of the SVPWM-VSI, which is widely used in sensorless AC motor drives, has considerable errors. In particular, the SVPWM-VSI is error-prone in the low speed range because the constant DC link voltage causes poor resolution in a low output voltage command and the output voltage is distorted due to dead time and voltage drop. This paper investigates a novel high-performance strategy for overcoming these problems in a sensorless ac motor drive. In this paper, a variation of the DC link voltage and a direct compensation for dead time and voltage drop are proposed. The variable DC link voltage leads to an improved resolution of the inverter output voltage, especially in the motor's low speed range. The direct compensation for dead time and voltage drop directly calculates the duration of the switching voltage vector without the modification of the reference voltage and needs no additional circuits. In addition, the proposed strategy reduces a current ripple, which deteriorates the accuracy of a monitored current and causes torque ripple and additional loss. Simulation and experimentation have been performed to verify the proposed strategy.

Sensorless Control Algorithm of a Surface Mounted PM Synchronous Motor Under Naturally Rotating by Load (외부부하에 의해 회전중인 표면부착형 영구자석동기전동기의 센서리스 제어 알고리즘)

  • Lee, Han-Sol;Cho, Kwan-Yuhl;Kim, Hag-Wone
    • The Transactions of the Korean Institute of Power Electronics
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    • v.23 no.1
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    • pp.16-23
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    • 2018
  • PM synchronous motor may be rotated to an arbitrary direction and speed by outside wind under natural condition in cases where the fan is applied outside, such as in vehicle radiators and outdoor air-conditioners. Sensorless controls that cannot detect rotor position requires additional sensorless control algorithm because a rotor is rotated by an external load. In this study, the sensorless control of a PM synchronous motor under naturally rotating condition is proposed. The natural rotation conditions are classified as forward high-speed rotation, reverse high-speed rotation, and low-speed rotation. Experiment results verify the performance of the sensorless control, including the rotor speed and position detection at natural rotation mode and switch to the closed-loop sensorless control.

Estimation of Back EMF for the Sensorless Controlled High Speed PMSM (센서리스 제어 고속 동기전동기의 역기전력 추정)

  • Lee, Jin-Woo
    • Proceedings of the KIPE Conference
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    • 2013.07a
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    • pp.114-115
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    • 2013
  • This paper proposes an estimation method of back emf for the sensorless controlled high speed PMSM drive in turbo compressors with air bearings. The back emf of PMSM motor varies due to the temperature variation, which deteriorates the control performance of sensorless controlled PMSM drives. The proposed method is based on the current model of the PMSM motor. The simulation results show that the proposed method estimates the back emf of sensorless controlled PMSM drives with reasonable accuracy for parameter adaptation.

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The study on the Sensorless PMSM Controlusing the Superposition Theory (중첩의 정리를 이용한 PMSM의 센서리스 재어에 관한 연구)

  • Hong, Jeng-Pyo;Kwon, Soon-Jae;Kim, Gyu-Seob;Sohn, Mu-Heon;Kim, Jong-Dal
    • Proceedings of the KIEE Conference
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    • 2002.07b
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    • pp.756-760
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    • 2002
  • This study presents a solution to control a Permanent Magnet Synchronous Motor without sensors. The control method is the presented superposition principle. This method of sensorless theory is very simple to compute estimated angle. Therefore computing time to estimate angle is shorter than other sensorless method. The use of this system yields enhanced operations, fewer system components, lower system cost, energy efficient control system design and increased efficiency. A practical solution is described and results are given in this Study. The performance of a Sensorless architecture allows an intelligent approach to reduce the complete system costs of digital motion control applications using cheaper electrical motors without sensors. This paper deals with an overview of sensorless solutions in PMSM control applications whereby the focus will be the new Controller without sensors and its applications.

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Stability Comparison of New Simplified Speed Sensorless Vector Control Systems for Induction Motors

  • Mangindaan, Glanny M.Ch.;Tsuji, Mineo;Hamasaki, Sin-Ichi
    • Journal of international Conference on Electrical Machines and Systems
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    • v.3 no.2
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    • pp.126-131
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    • 2014
  • This paper discusses stability of new simplified sensorless vector control systems of induction motors (IM). The simplified sensorless systems estimate the flux angle by using the output voltage of d-axis PI current controller to achieve the q-axis flux zero. Two simplified sensorless systems are studied. The difference of two systems is the presence or absence of a q-axis PI current controller. The systems stability is compared by deriving linear state equations and showing root loci and unstable regions. Furthermore, transient responses and experiment results make clear the stability of the proposed system.

Sensorless Starting of Direct Drive Horizontal Axis Washing Machines

  • Dianov, Anton;Kim, Nam Su;Lim, Seung Moo
    • Journal of international Conference on Electrical Machines and Systems
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    • v.3 no.2
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    • pp.148-154
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    • 2014
  • This paper describes problems of the sensorless starting of horizontal axis washing machines with direct drive and suggests solution, which was experimentally verified. Horizontal axis washing machines have very difficult conditions for the drive starting, especially at full load. Inertia of the tub and water, torque from the laundry make load torque at starting higher than rated one and sometimes even higher than the maximum torque of the motor, which makes sensorless starting extremely challenging task. This paper suggests modified open-loop starting, where control system is closed shortly after beginning at low speed and rotates the drum until laundry restructuring. To ensure proper work of the sensorless algorithm at low speed additional measures for increasing of the estimation algorithm performance have been taken. These measures include special algorithm for the drive parameters estimation, which has been developed and verified by the experimental results.

The study of sensor malfunction detection and conversion to Sensorless control when the failure of rotational speed sensor is occurred (풍력발전기의 회전속도센서 고장 검출 및 Sensorless 제어로의 운전 전환 연구)

  • Oh, Joongki;Choi, Wonsik;Park, Kihyun;Park, Hyunchul
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.11a
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    • pp.183.1-183.1
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    • 2010
  • 본 논문에서는 풍력발전기의 회전속도센서의 고장 발생 시 고장을 검출하고 회전속도센서의 사용 없이 Sensorless 제어로의 전환에 관한 연구를 기술하였다. 최근 풍력발전은 급속한 성장함에 따라 풍력발전기의 대형화 및 해상풍력화 추세에 있다. 특히 해상풍력발전은 바람 및 설치장소의 제약에서 벗어나는 이점에 반해 염해, 습도 및 파도에 의한 진동 발생으로 센서의 고장 발생률이 높을 것으로 예상된다. 이에 따라 풍력발전기의 회전속도센서 고장 발생 시 이를 검출하는 방법을 제시하였다. 또한 회전속도센서의 고장이 검출되면 회전속도센서를 이용한 풍력발전기 제어방식에서 Sensorless 제어로의 전환을 통해 안전하게 풍력발전기를 운전할 수 있도록 하였다. 연구된 제어기법은 PSIM을 이용한 시물레이션을 통해 결과를 검증하였다.

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Sensorless Control of PMSM by a Four-Switch Inverter with Compensation of Voltage Distortion and Adjustment of Position Estimation Gain

  • Kim, Byeong-Han;Lee, Dong-Myung
    • Journal of Electrical Engineering and Technology
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    • v.12 no.1
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    • pp.100-109
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    • 2017
  • This paper proposes performance improvement schemes for sensorless PMSM control drive using a four-switch three-phase inverter (so-called B4 inverter). In the proposed scheme, the back-EMF estimation-based sensorless control algorithm is used to control the brushless PMSM without position sensors. In order to have stable operation, this paper presents a gain adjustment scheme that compensates the reduction of stable sensorless operation range as long as the rotor speed increases. In B4 topology, the center point of dc-link capacitors is connected to 3-phase load, and it is prone to have the load current distortion. Hence, to mitigate this problem, a distortion compensation scheme by modifying voltage commands using measured dc-link potentials is proposed in this paper. The validity of the proposed method is evaluated by simulations and experiments.