• Title, Summary, Keyword: Rotor position detection

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Indirect Detection of Rotor Position of Switched Reluctance Motor Based on Flux Linkage Analytic Model

  • Zhou, Yongqin;Hu, Bo;Wang, Hang;Jin, Ningzhi;Zhou, Meilan
    • Journal of Electrical Engineering and Technology
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    • v.13 no.2
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    • pp.829-837
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    • 2018
  • In this paper, a flux linkage model based on four magnetization curves fitting is proposed for three-phase 12/8 switched reluctance motor (SRM), with the analysis of the basic principle of flux detection method and function analysis method. In the model, the single value function mapping relationship between position angle and flux is established, which can achieve a direct estimation of rotor position. The realization scheme of SRM indirect position detection system is presented. It is proved by simulation and experiment that the proposed scheme is suitable for rotor position detection of SRM, and has high accuracy of position estimation.

Interior Central Pole Search Coils for Initial Rotor Position Detection of a Toroidal SRM (토로이달 SRM의 초기 회전자 위치검출을 위한 돌극 관통 서치코일)

  • 양형열;임영철
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.53 no.7
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    • pp.473-482
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    • 2004
  • In this paper, a detection technique of initial rotor position at a standstill in Toroidal Switched Reluctance Motor(TSRM) with built-in interior central pole search coil is proposed. In case search coils are used as a position sensor, it has many advantages like low cost, decrease in the volume, high robust characteristics and wide applications. 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 detection method of initial rotor position is suggested using interior central pole search coil. The simulation and experiment for the proposed method and their results support the validity of the proposed scheme by verifying the operation of a 6/4 TSRM using search coils.

Drive of Single-phase Switched Reluctance Motors Using Search Coils (서치코일을 이용한 단상 SRM의 구동)

  • Shin, D.S.;Yang, H.Y.;Lim, Y.C.
    • Proceedings of the KIPE Conference
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    • pp.750-753
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    • 2005
  • This paper presents a method of detecting rotor position for single phase Switched Reluctance Motors(SRMs) using searchs coil. In the single phase SRM, mainly Hall effect sensors or photo interrupters have been used to detect the rotor position. But these sensors cause high cost and increase the volume of the motor, Furthermore when the motor is used in very hostile environment like high temperature or pressure, its reliability goes down. In this paper, low cost and robust characteristics of rotor position detection method are focused in order to compensate for disadvantage of existing sensors. Search coils wound around the stator pole are used for detection of the rotor position in single phase SRM. Rotor position detection is achieved through electromotive force patterns induced by time-varying flux linkage in the search coil. The validity of the method is verified by experimental results.

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Initial Rotor Position Detection of a Toroidal SRM Using the Rate of Change of Current (전류변화율을 이용한 토로이달 SRM의 초기위치 경출 방법)

  • Yang Hyong-Yeol;Lim Young-Cheol
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.54 no.1
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    • pp.26-32
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    • 2005
  • Rotor position information is essential in the operation of the switched reluctance motor(SRM) drive for generation the phase current switching signals. When an incremental encoder is used as a rotor position sensor, the initial rotor position can not be detected. Some sensorless rotor position estimation methods also have the same problem. In these systems, to initially align the rotor, the forced alignment method has a delay and reverse rotation before the motor can start. Therefore it can not be acceptable for unidirectional drive systems. So the forced alignment method is not desirable in all drive systems and the research on the SRM drives should be directed to a system without rotor alignment. In this paper, a new detection method of initial rotor position using the rate of change of current is suggested. Firstly, di/dt versus θ/sub R/ reference table, which is the relation between the rate of change of current and rotor position, is generated and then the squared Euclidean distance method is used to estimate the rotor position based on the table. The simulated and experimental results are presented demonstrating the feasibility and accuracy of this method.

Switched Reluctance Motor Drives Using Interior Central Pole Search Coils (돌극관통 서치코일을 이용한 스위치드 릴럭턴스 모터의 회전자 위치검출 및 구동)

  • Shin D. S.;Yang H. Y.;Lim Y. C.
    • Proceedings of the KIPE Conference
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    • pp.196-200
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    • 2004
  • This paper presents a new method of detecting rotor position in Toroidal Switched Reluctance Motor(TSRM). In this paper, low cost and robust characteristics of rotor position detection method are focused in order to compensate for disadvantage of general sensors. Search coils wound through the hole of the stator poles are used for detection of the rotor position in TSRM. Rotor position detection is achieved through electromotive force patterns induced by time-varying flux linkage in the search coils and then adequate phase is excited for drive. The initial rotor position estimation method is also described. The validity of the method is verified by experimental results.

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Speed Control of 8/6 Switched Reluctance Motor Using New Rotor Position Detection Techniques (새로운 회전자검출 방법에 의한 8/6 스위치드 리럭턴스 모터 속도 제어)

  • Jung, Do-Young;Park, Young-Rock
    • Journal of the Korean Society of Industry Convergence
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    • v.6 no.4
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    • pp.333-337
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    • 2003
  • This paper proposed new techniques of rotor position detection for 8/6 pole Switched Reluctance Motor(SRM). This technique is very simple and easy to find out rotor position. The main idea uses the impulse responses which have different values between aligned and unaligned rotor position. In order to obtain the informations of the rotor position, the impulse applied to the unenergized phases and their responses are analyzed to control the speed of SRM without shaft sensor. Experimental results verify the feasibility of the proposed method.

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A Simple Fault Correction Method for Rotor Position Detection of Brushless DC Motor using a Latch Type Hall Effect Sensor

  • Baik In-Cheol;Joo Hyeong-Gil
    • Journal of Power Electronics
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    • v.5 no.1
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    • pp.62-66
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    • 2005
  • A simple fault correction method for rotor position detection of a brushless DC(BLDC) motor with trapezoidal back EMF(electromotive force) using a Hall effect latch unit is presented. The reason why the Hall effect latch unit does not operate properly during the startup of a BLDC motor is thoroughly explained. To solve this problem, a simple code change method and its hardware implementation issues are proposed and discussed.

Rotor Position Detection of CPPM Belt Starter Generator with Trapezoidal Back EMF using Six Hall Sensors

  • Xu, Jiaqun;Long, Feng;Cui, Haotian
    • Journal of Magnetics
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    • v.21 no.2
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    • pp.173-178
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    • 2016
  • Six-step commutation control widely used in brushless DC (BLDC) motor can be applied to consequent pole permanent magnet (CPPM) belt starter generator (BSG) with trapezoidal back electromotive force (EMF) in the starter state. However, rotor position detection with three Hall sensors in BLDC motor can hardly be employed in CPPM BSG due to asymmetric flux distribution in each pole side of CPPM BSG. This paper presents a low-cost rotor position detection method for CPPM BSG in which six Hall sensors are proposed to be used based on the analysis of flux distribution by 3D FEA. In the method, the six Hall sensors are divided into three groups and two signals in each group are combined through performing logic operations. In addition, offset angle between back EMF and the related Hall signal can be compensated by moving the Hall sensors. Experiments of a 2 kW CPPM BSG prototype have also been performed to verify the proposed method.

Rotor Position Detection of a Toroidal Switched Reluctance Motor Using Interior Central Pole Search Coils (돌극 관통형 서치코일을 이용한 토로이달 스위치드 릴럭턴스 모터의 회전자 위치 검출)

  • Yang Hyong-Yeol;Lim Young-Cheol
    • The Transactions of the Korean Institute of Power Electronics
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    • v.9 no.5
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    • pp.448-456
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    • 2004
  • This paper presents a new method of detecting rotor position in Toroidal Switched Reluctance Motor (TSRM). In this paper, low cost and robust characteristics of rotor position detection method are focused in order to compensate for disadvantage of general sensors. Search coils wound through the hole of the stator poles are used for detection of the rotor position in TSRM. Rotor position detection is achieved through electromotive force patterns induced by time-varying flux linkage in the search coils and then adequate phase is excited for drive. The validity of the method is verified by experimental results.

Rotor Position Detection of Toroidal Switched Reluctance Motor Using Search Coils (서치 코일을 이용한 토로이달 스위치드 릴럭턴스 모터의 회전자 위치 검출)

  • 양형열;김종건;임영철
    • The Transactions of the Korean Institute of Power Electronics
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    • v.7 no.6
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    • pp.537-545
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    • 2002
  • This paper presents a new method of detecting rotor position in Toroidal Switched Reluctance Motor(TSRM). In this paper, low cost and robust characteristics of rotor position detection method are focused in order to compensate for disadvantage of existing sensors. Search coils wound around stator poles are used for detection of rotor position in TSRM. Rotor position detection is achieved through electromotive force patterns induced by time-varying flux linkage in the search coils and then adequate phase is excited for drive. The validity of the method is verified by experimental results.