• Title/Summary/Keyword: Rotor Position Detection

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A Study on a Rotor Position Sensor Offset Detection Method in a Permanent Magnet Synchronous Generator (영구자석형 동기발전기의 회전자 위치검출 센서의 옵셋 검출에 관한 연구)

  • Park, Kyusung;Shin, Sung-Hwan;Lee, Hokwang;Yoon, Youngdeuk;Lee, Geunho
    • Journal of Institute of Control, Robotics and Systems
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    • v.20 no.9
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    • pp.914-921
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    • 2014
  • In this paper, an algorithm is suggested to detect an offset angle of the absolute rotor position sensor after the initial assembly of a PMSG. Unlike previous studies in a stationary state, this one is not designed to detect an electrical angle but rather the absolute position of the rotor is detected while operating the generator. Also,a position sensor, current sensors and voltage sensor were used to ensure reliability. This technique completes the detection of the sensor offset in two steps. In the first step, a zero-crossing of the EMF is measured using a voltage sensor to detect the electrical angle offset when the alternator is actuated by the engine. In the second step, a high frequency current is injected along the d-axis on-line during the control of the generation, eventually to obtain the inductance using a DFT (Discrete Fourier Transform), and then to ultimately extract the final electrical angle offset through the comparison of the inductance magnitude. The suggested algorithm was validated with PSIM simulation and, furthermore, was tested with actual experiments on a dynamometer.

Sensorless Control of SRM (SRM의 센서리스 구동)

  • Lee Ju-Hyun;Park Sung-Jun;Ahn Jin-Woo
    • Proceedings of the KIPE Conference
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    • 2004.07a
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    • pp.228-230
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    • 2004
  • This paper describes a new method of detecting rotor position in switched reluctance motor(SRM). Some strategies of position sensorless control methods for the motor include the measurement of phase current and applied pulse voltage in an unexcited phase. The principle of the estimation of a rotor position is based on the detection of inductance by pulse currents. Suggested method is verified by some experimental tests.

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A Fault Diagnostic Method for Position Sensor of Switched Reluctance Wind Generator

  • Wang, Chao;Liu, Xiao;Liu, Hui;Chen, Zhe
    • Journal of Electrical Engineering and Technology
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    • v.11 no.1
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    • pp.29-37
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    • 2016
  • Fast and accurate fault diagnosis of the position sensor is of great significance to ensure the reliability as well as sensor fault tolerant operation of the Switched Reluctance Wind Generator (SRWG). This paper presents a fault diagnostic scheme for a SRWG based on the residual between the estimated rotor position and the actual output of the position sensor. Extreme Learning Machine (ELM), which could build a nonlinear mapping among flux linkage, current and rotor position, is utilized to design an assembled estimator for the rotor position detection. The data for building the ELM based assembled position estimator is derived from the magnetization curves which are obtained from Finite Element Analysis (FEA) of an SRWG with the structure of 8 stator poles and 6 rotor poles. The effectiveness and accuracy of the proposed fault diagnosis method are verified by simulation at various operating conditions. The results provide a feasible theoretical and technical basis for the effective condition monitoring and predictive maintenance of SRWG.

Sensing Method of the Initial Rotor Position in Switched Reluctance Motors Using Search Coils (서치 코일을 이용한 스위치드 릴럭턴스 모터의 초기 회전자 위치 검출법)

  • Song J.S.;Yang H.Y.;Ryoo Y.J.;Lim Y.C.
    • Proceedings of the KIPE Conference
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    • 2003.07b
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    • pp.681-685
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    • 2003
  • In this paper, an sensing method of initial rotor position in Switched Reluctance Motor(SRM) at standstill is proposed. In case search coils are used as a position sensor, A search coil used in a method of detecting positions of TSRM has many advantages, which is highly efficient in low cost and maintenance free, and characterized by its function and role as a position sensor. However, the initial rotor position detection is very difficult because the search coil's EMF is not exist at a standstill. In this paper, a new sensing method of initial rotor position using squared Euclidean distance at a standstill too is suggested. The simulation and experiment for the proposed method are achieved. The validity of the proposed method is verified by experimental results.

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A Design and Construction of Speed Encoder for High Performance Driving of SRM (SRM 고정도 구동을 위한 위치 및 속도엔코더의 설계 및 제작)

  • Kang, Yu-Jung;Oh, Seok-Kyu;Park, Sung-Jun;Ahn, Jin-Woo
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.1191-1193
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    • 2001
  • In switched reluctance motor(SRM) drive, it is necessary to synchronize the stator phase excitation with the rotor position. Therefore, the rotor position information is essential. Usually, optical encoders or resolvers are used to provide the rotor position information. These sensors are expensive and are not suitable for high speed operation. This paper proposes a new encoder for high performance excitation control of SRM. The proposed encoder has complex structures of incremental and absolute encoder. An each phase inductance profile can be synchronized with 4-bit absolute position signal and incremental pulses are used for speed detection. Low cost and simple structure are possible.

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An Analysis of Position Detection Error of the Sensorless Controller for BLDC Motors (영구자석 매입형 BLDC 모터의 Sensorless 속도제어기 위치검출 오차 분석)

  • Lee, Dong-Myung;Kim, Hag-Wone;Yang, Soon-Bae;Ahn, Jun-Ho;Cho, Kwan-Yuhl
    • Proceedings of the KIEE Conference
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    • 1999.07f
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    • pp.2761-2763
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    • 1999
  • In this paper, we analyzed the characteristics of the detected EMF signals used to detect the rotor position in the IPM(Interior Permanent Magnet) BLDC motor and SPM (Surface Permanent Magnet) BLDC motor. The position sensing signal, in the IPM BLDC motors, advances the real rotor position due to the variation of the rotor inductances. This fact was verified by the simulation and experiment.

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Sensorless control of PMSM in low speed range using high frequency voltage injection (전압주입 방식을 이용한 PMSM 센서리스 제어에 관한 연구)

  • Yoon Seok-chae;Kim Jang-mok
    • Proceedings of the KIPE Conference
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    • 2003.11a
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    • pp.119-122
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    • 2003
  • This paper describes the sensorless technique for the surface-mounted permanent-magent synchronous motor(SPMSM or PMSM) drive based on magnetic saliency. The control technique is a sensorless control algorithm that injects the high frequency voltage to the stator terminal in order to estimate the rotor position and speed. The rotor position and speed for sensorless vector control is achieved by appropriate signal processing to extract the position information from the stator current in the low speed range including zero speed. Proposed sensorless algorithm using the double-band hysteresis controller and initial rotor position detection exhibits excellent reference tracking and increased robustness. Experimental results are presented to verify the feasibility of the proposed control schemes.

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Inductance Reasoning Method for Sensorless Control of an SRM (SRM의 센서리스 제어를 위한 인덕턴스 추론기법)

  • 안진우;박성준;김태형
    • The Transactions of the Korean Institute of Power Electronics
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    • v.8 no.5
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    • pp.427-434
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    • 2003
  • This paper describes a new method of detecting rotor position in switched reluctance motor(SRM), Some strategies of position sensorless control methods for the motor include the measurement of phase current and applied pulse voltage in an unexcited phase. 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 compute rotor position estimation and gives efficient control of drive system. Suggested method is verified by some experimental tests.

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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A New Approach to Sensorless Control Method for Brushless DC Motors

  • Kim, Tae-Sung;Park, Byoung-Gun;Lee, Dong-Myung;Ryu, Ji-Su;Hyun, Dong-Seok
    • International Journal of Control, Automation, and Systems
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    • v.6 no.4
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    • pp.477-487
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    • 2008
  • This paper proposes a new position sensorless drive for brushless DC (BLDC) motors. Typical sensorless control methods such as the scheme with the back-EMF detection method show high performance only at a high speed range because the magnitude of the back-EMF is dependent upon the rotor speed. This paper presents a new solution that estimates the rotor position by using an unknown input observer over a full speed range. In the proposed method, a trapezoidal back-EMF is modelled as an unknown input and the proposed unknown input observer estimating a line-to-line back-EMF in real time makes it possible to detect the rotor position. In particular, this observer has high performance at a low speed range in that the information of a rotor position is calculated independently of the rotor speed without an additional circuit or complicated operation process. Simulations and experiments have been carried out for the verification of the proposed control scheme.