• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 F
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• pp.2136-2138
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• 1997

This paper describes a new detecting method of initial rotor position for PMSM without a position sensors. The proposed method uses the fact that the back-EMF is differently generated according to tile initial rotor position of Permanent Magnet Synchronous Motor (PMSM). The voltage with short duty is impressed to each phase at standstill. Then, we can detect the rotor position by comparing the amplitudes and signs of three phase current each other. Experimental results show the validity of the proposed method.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.304-307
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• 2001

This Paper describes a method for indirect sensing of the rotor position in switched reluctance motors(SRM's) using only current sensors. The detailed operation and simulation of this technique is shown. In particular, current waveform should have at least one peak and estimate the speed and rotor position by detecting position. The simulation result shows that the technique can gives the information of rotor position.

• Journal of international Conference on Electrical Machines and Systems
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• 제2권1호
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• pp.97-103
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• 2013

This paper describes the characteristics of Electronic Throttle Controller (ETC) module in BLDC motor without the hall sensor for detecting a rotor position. The proposed ETC control system, which is mainly consisted of a BLDC motor, a throttle plate, a return spring and reduction gear, has a position sensor with an analogue voltage output on the throttle valve instead of BLDC motor for detecting the rotor position. So the additional commutation information is necessarily needed to control the ETC module. For this, the estimation method is applied. In order to improve and obtain the high resolution for the position control, it is generally needed to change the gear ratio of the module or the electrical switching method etc. In this paper, the 3-phase switching between successive commutations is adapted instead of the 2-phase switching that is conventionally used. In addition, the position control with a variable PI gain is applied to improve a dynamic response during a transient period and reduce vibration at a stop in case of matching position reference. The mentioned method can be used to estimate the commutation state and operate the high-precision position control for the ETC module and the high response characteristics. The validity of the proposed method is examined through the experimental results.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2012년도 추계학술대회 논문집
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• pp.21-22
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• 2012

This paper propose initial rotor position detecting algorithm of incremental encoder. The proposed algorithm estimates d-axis initial position of PMSM using 6 step operation. The proposed algorithm is verified by experimentally.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2005년도 전력전자학술대회 논문집
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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.

• 전력전자학회논문지
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• 제7권6호
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• pp.537-545
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• 2002

본 논문에서는 스위치드 릴럭턴스 모터의 새로운 회전자 위치 검출법을 제안한다. 기존의 위치센서의 약점을 보완하기 위해 위치 검출 방법의 저 비용과 강인성에 관심을 갖고, 시변 쇄교자속에 의해 토로이달 SRM의 내부에 장착된 서치 코일에 유기되는 전압 파형을 이용하여 위치 검출을 시도하였다. 서치 코일에서 유기되는 전압 파형이 회전자의 위치정보를 포함하고 있으므로, 이를 이용해 회전자의 특정위치를 검출하고 적절한 상을 여자시킴으로써 SRM을 구동할 수 있게 된다. 실험을 통하여 서치코일만을 이용하여 토로이달 SRM을 구동시킨 결과와 엔코더를 사용하여 구동시킨 결과와 비교함으로써 본 논문에서 제시한 방법의 타당성을 검증하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2004년도 전력전자학술대회 논문집(1)
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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.

• 전력전자학회논문지
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• 제22권1호
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• pp.53-59
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• 2017

The information on the actual voltages and actual currents of the motor is required for the sensorless control of a permanent magnet synchronous motor without rotor position sensors. In the model-based rotor position estimator of a PM synchronous motor, the reference voltages, which are the outputs of the current controller, are commonly used. The reference voltages in over-modulation regions for high-speed operation differ from the actual voltages applied to the motor. Consequently, the estimated rotor position and rotor speed may fail to track the real rotor position and real rotor speed. In this paper, the sensorless control for a PM synchronous motor in over-modulation regions for high-speed operation is proposed. The three-phase voltages applied to the motor are measured by using additional voltage detection circuits, and the performance of the rotor position estimator based on the measured three-phase voltages is validated through the experimental results.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2004년도 전력전자학술대회 논문집(1)
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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.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2016년도 전력전자학술대회 논문집
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• pp.521-522
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• 2016

This paper presents a novel scheme to estimate the rotor position of a single-phase hybrid switched reluctance motor (HSRM). The proposed method uses the differential of back-EMF within a position region to estimate rotor position. By detecting the crossing-zero signal of back-EMF differential value, the minimum position of back-EMF corresponding to an absolute rotor position can be captured and used for position estimation four times in every mechanical rotation. In this way, a sensorless operation with adjustable turn on/off angle can be achieved without substantial computation. For the starting, two current comparators are adopted. The experimental verification using a prototype drive system is provided to demonstrate the viability of the proposed sensorless scheme.