• Title/Summary/Keyword: current sensorless

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Rotor Initial Polarity Detection Method of Single-Phase PMSM Considering Asymmetric Air-Gap Structure (단상 영구자석 동기 전동기의 비대칭 공극 구조를 고려한 회전자 초기 자극 검출 기법)

  • Seo, Sung-Woo;Hwang, Seon-Hwan;Park, Jong-Won;Kim, Yong-Hyu
    • The Transactions of the Korean Institute of Power Electronics
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    • v.27 no.1
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    • pp.80-83
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    • 2022
  • This paper proposes an initial rotor polarity detection algorithm of a single-phase permanent magnet synchronous motor (SP-PMSM) related to stable open-loop starting for sensorless operation. Generally, the SP-PMSM needs an asymmetric air-gap structure to can avoid the initial starting failure at zero torque point. Therefore, the rotor polarity information can be obtained by using the DC offset current direction of a stator current through a high frequency voltage injection into an SP-PMSM with an asymmetric air gap. In this paper, the proposed rotor initial polarity detection algorithm is verified through several experimental results.

Speed Sensorless Vector Control of Wound Induction Motor Using a MRAS Method (MRAS 기법을 이용한 권선형 유도전동기의 속도센서리스 벡터제어)

  • Choi, Hyun-Sik;Lee, Jae-Hak;Um, Tae-Wook
    • Journal of the Institute of Electronics Engineers of Korea TE
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    • v.42 no.1
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    • pp.29-34
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    • 2005
  • The wound induction motor can provide high starting torque and reduced starting current simultaneously by inserting large resistor externally when starting. And this technique is one of the well known methods among the induction motor starting methods and generally used for heavy load starting such as crane and cement factories. The conventional PI controller has been widely used in industrial application due to the simple control algorithm and is generally used for control of current torque, position, and speed for the wound induction motor drive system. However, the conventional control system for wound induction motor may result in poor performance because sensors have to be used but are often limited by the environmental condition. Recently, to overcome these problems, many sensorless vector control methods for the wound induction motor have been studied. This paper presents a MRAS method for sensorless vector control of the wound induction motor drive. In the conventional MRAS method, in low frequency, the stator resistance variation may result in poor performance. Therefore, this paper presents a MRAS method with stator and rotor resistance tuning for sensorless vector control of the wound induction motor to overcome several shortages of the conventional MRAS caused by parameter variation and to enhance the robustness of the sensorless vector control. The validity and effectiveness of the proposed method is verified through digital simulation.

A High-Performance Position Sensorless Motion Control System of Reluctance Synchronous Motor with Direct Torque Control (직접토크제어에 의한 위치검출기 없는 릴럭턴스 동기전동기의 위치 제어시스템)

  • 김동희;김민회;김남훈;배원식
    • The Transactions of the Korean Institute of Power Electronics
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    • v.7 no.5
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    • pp.427-436
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    • 2002
  • This paper presents an implementation of high-dynamic performance of position sensorless motion control system of Reluctance Synchronous Motor(RSM) drives for an industrial servo system with direct torque control(DTC). The problems of high-dynamic performance and maximum efficiency RSM drives controlled by DTC are saturation of stator linkage flux and nonlinear inductance characteristics with various load currents. The accurate estimation of the stator flux and torque are obtained using stator flux observer of which a saturated inductance $L_d$ and $L_q$ can be compensated by adapting from measurable the modulus of the stator current and rotor position. To obtain fast torque response and maximum torque/current with varying load current, the reference command flux is ensured by imposing $I_{ds} = I_{qs}$. This control strategy is proposed to achieve fast response and optimal efficiency for RSM drive. In order to prove rightness of the suggested control algorithm, the actual experiment carried out at $\pm$20 and $\pm$1500 rpm. The developed digitally high-performance motion control system shown good response characteristic of control results and high performance features using 1.0kW RSM which has 2.57 Ld/Lq salient ratio.

Input AC Voltage Sensorless Control for a Three-Phase Z-Source PWM Rectifier (3상 Z-소스 PWM 정류기의 입력 AC 전압 센서리스 제어)

  • Han, Keun-Woo;Jung, Young-Gook;Lim, Young-Cheol
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.3
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    • pp.355-364
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    • 2013
  • Respect to the input AC voltage and output DC voltage, conventional three-phase PWM rectifier is classified as the voltage type rectifier with boost capability and the current type rectifier voltage with buck capability. Conventional PWM rectifier can not at the same time the boost and buck capability and its bridge is weak in the shoot- through state. These problems can be solved by Z-source PWM rectifier which has all characteristic of voltage and current type PWM rectifier. By shoot-through duty ratio control, the Z-source PWM rectifier can buck and boost at the same time, also, there is no need to consider the dead time. This paper proposes the input AC voltage sensorless control method of a three-phase Z-source PWM rectifier in order to accomplish the unity input power factor and output DC voltage control. The proposed method is estimated the input AC voltage by using input AC current and output DC voltage, hence, the sensor for the input AC voltage detection is no needed. comparison of the estimated and detected input AC voltage, estimated phase angle of the input voltage, the output DC voltage response for reference value, unity power factor, FFT(Fast Fourier Transform) of the estimated voltage and efficiency are verified by PSIM simulation.

Sensorless measurement of the DC link capacitor current of three-phase inverter (3상 인버터의 DC 링크 커패시터 전류의 센서리스 측정)

  • Qiu, Xiao-Dong;Jung, Young-Gook;Lim, Young-Cheol
    • Proceedings of the KIPE Conference
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    • 2012.11a
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    • pp.205-206
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    • 2012
  • A general method to measure the inverter DC bus capacitor current is described. It is an indirect estimated method. By measuring the input and out voltage and current can calculate DC bus capacitor current. This paper will develope the theory that describes the indirect method. It will discuss and verify the feasibility of this approach through the use of the PSIM. Using SPWM control method will be simulated and compared.

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Neutral-Point Voltage Ripple Reduction of High Frequency Injection Sensorless Control of IPMSM Fed by a Three-Level Inverter (3레벨 인버터로 구동되는 IPMSM의 고주파 주입 센서리스 운전에서 중성점 전압 리플 저감)

  • Cho, Dae-Hyun;Kim, Seok-Min;Lee, Kyo-Beum
    • Journal of IKEEE
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    • v.24 no.3
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    • pp.867-876
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    • 2020
  • This paper proposes a neutral-point voltage ripple reduction of high frequency injection sensorless control of IPMSM fed by a three-level inverter. The high frequency voltage injection method has been successfully applied to sensorless control for IPMSM at low speed region. In the process of high frequency voltage injection sensorless control for IPMSM, the neutral-point voltage ripple is increased. It should be reduced because it distorts the output current and decreases a life time of DC-link capacitor. The proposed method in this paper reduces the neutral-point voltage ripple by compensating the reference voltage, and the compensation value is calculated simply with reference voltages and currents. The effectiveness of the proposed method is verified by simulation results.

A Position Sensorless Motion Control System of Reluctance Synchronous Motor with Direct Torque Control (직접토크제어에 의한 위치센서 없는 리럭턴스 동기전동기의 위치제어 시스템)

  • Kim, Min-Huei;Lee, Bok-Yong;Kim, Kyung-Sik
    • Proceedings of the KIEE Conference
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    • 2002.06a
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    • pp.135-141
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    • 2002
  • This paper presents an implementation of high-dynamic performance of position sensorless motion control system of Reluctance Synchronous Motor(RSM) drives for an industrial servo system with direct torque control(DTC), The problems of DTC for high-dynamic performance and maximum efficiency RSM drive due to a saturated stator linkage flux and nonlinear inductance curve with various load currents, The accurate estimation of the stator flux and torque are obtained using stator flux observer of which a saturated inductance Ld and Lq can be compensated by adapting from measurable the modulus and angle of the stator current space vector. To obtain fast torque response and maximum torque/current with varying load current, the reference command flux is ensured by imposing Ids=Iqs. This control strategy is proposed to fast response and optimal efficiency for RSM drive. In order to prove rightness of the suggested control algorithm, the actual experiment carried out at ${\pm}$20 and ${\pm}$1500 rpm. The developed digitally high-performance control system are shown some good response characteristic of control results and high performance features using 1.0kW RSM of which has 2.57 Ld/Lq salient ratio.

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A Study on Speed Variable Proportional Resonant Current Controller of Single-Phase PMSM (단상 영구자석 동기전동기의 속도 가변형 비례공진 전류제어에 관한 연구)

  • Lee, Won-Seok;Hwang, Seon-Hwan;Park, Jong-Won
    • Journal of IKEEE
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    • v.24 no.4
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    • pp.954-960
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    • 2020
  • This paper proposes a speed variable proportional resonant current control method for a single-phase permanent magnet synchronous motor(PMSM). Due to the electromagnetic characteristics of a single-phase PMSM, negative and zero torques are generated in the part corresponding to the phase difference between the stator current and the back electromotive force. In addition, overcurrent limitation is required because of the low stator resistance and inductance in sensorless operation. When using the vector control for current control of single-phase PMSM under these conditions, processes of coordinate transformation, inverse coordinate transformation, and generation of virtual dq-axis components are required. However, the proposed variable speed proportional resonant current control method does not need the coordinate transformation used for AC motors. In this paper, we have confirmed stable maneuverability by using variable proportional resonant current control algorithm, and proposed sensorless control based on a mathematical model of a single-phase PMSM without a position sensor when reaching a constant speed. The usefulness of the current control method was verified through several experiments.

Sensorless Control of High-Speed BLDC (고속 BLDC 전동기의 센서리스 제어)

  • Cho, Heung-Hyeon;Kim, Won-Bae
    • The Journal of the Korea institute of electronic communication sciences
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    • v.15 no.3
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    • pp.503-512
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    • 2020
  • The products using blowers include hand dryers, automatic car washers, dryers, and vacuum cleaners. The features of these products require a structure and control algorithm so that a strong wind is blown out at the moment. Electric motors according to the existing excitation method include a direct winding type, a decentralized type, a lottery type, and a permanent magnet type. Conventional electric motors have a disadvantage when the starting current is large during high-speed rotation and the number of rotations is irregular. In order to improve this, research on high-speed BLDC motor control has designed 800W-class high-speed BLDC motor control and circuit through driving circuit design, sensorless control algorithm, simulation, experiment, etc., and more than 95% high efficiency evaluation method of driving performance of controller, prototype experiments and verification were studied.

Speed Sensorless Control of Switched Reluctance Motor (스위치드 리럭턴스 전동기의 센서리스 속도제어)

  • Shin, Kyoo-Jae;Kwon, Young-Ahn
    • Journal of IKEEE
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    • v.2 no.2 s.3
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    • pp.166-172
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    • 1998
  • Switched reluctance motor(SRM) has the advantages of simple structure, low rotor inertia and high efficiency. However, position sensor is essential in SRM in order to synchronize the phase excitation to the rotor Position. The Position sensors increase the cost of drive system and tend to reduce system reliability. This paper investigates the speed control of sensorless SRM in which the Phase current and change rate are utilized in position decision, and the period of dwell angle is variable for speed control. The proposed system consists of Position decision circuit, speed controller, digital logic commutator, switching angle controller and inverter The performances in the proposed system are verified through the experiment.

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