• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(2)
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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.

• 전기전자학회논문지
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• 제23권2호
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• pp.622-627
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• 2019

본 논문에서는 비대칭 공극을 갖는 단상 영구자석 동기 전동기의 센서리스 운전을 위한 초기 회전자 위치 검출 알고리즘을 제안한다. 일반적인 센서리스 운전 기법 중 역기전력 기반의 센서리스 제어는 영속 및 저속운전에서 역기전력 정보를 추정하기 어렵다. 이를 위해 오픈 루프 기동 기법이 필수적으로 요구되고 일정한 방향으로의 회전을 위해서는 회전자의 초기 위치 검출이 반드시 필요하다. 본 논문에서는 단상 영구자석 동기 전동기의 자기적 특성을 이용하여 고주파 전압 주입 신호에 옵셋 전압을 추가하여 회전자 자극을 검출하는 기법을 제안한다. 다수의 실험 결과를 통하여 제안된 알고리즘의 유효성과 유용성을 검증하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.207-209
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• 2005

Recently, the use of IPMSM is coming to be active, in many industrial applications. In sensorless drive of IPMSM, it is important to know the exact information of the initial rotor position, because the wrong estimation of the initial rotor position brings about the decrease of the starting torque, or a temporary reverse revolution, In addition, PMSM is necessary to use the accurate information of the inductance for the precise torque control owing to the reluctance torque. In this paper presents initial rotor position estimation method and, measure method of the each-axis inductance. And to minimize the speed estimations error, the estimated speeds are compensated by using an instantaneous reactive power in synchronously rotating reference frame.

• 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.

• 한국인터넷방송통신학회논문지
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• 제20권3호
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• pp.141-146
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• 2020

브러시리스 DC 전동기(BLDC)는 스위치의 on/off 각이 최적의 고정자와 회전자의 정렬상태에 의해 결정되는 반면에, 스위치드 릴럭턴스 전동기 (SRM)은 스위치의 on/off 각이 많은 파라미터의 복잡한 함수로 나타나고 따라서 최적의 운전을 하기 위해서는 스위칭 각이 가변적으로 된다. 따라서 스위치드 릴럭턴스 전동기 (SRM)을 최적으로 운전하기 위해서 고해상도의 위치 센서와 복잡한 부가 회로 등을 이용하여 회전자 위치를 검출할 수 있다. 본 논문에서는 스위치드 릴럭턴스 전동기 (SRM)를 구동할 수 있는 여러 가지 방법 중 엔코더, 홀센서, 옵토-인터럽터 (opto interrupter) 등 다양한 센서들을 활용하여 회전자 위치 검출 및 관련 위치 검출 회로적용, 검출된 회전자의 초기위치 확보에 관한 연구를 하였다.

• 전력전자학회논문지
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• 제16권6호
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• pp.602-609
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• 2011

본 논문은 역기전력 기반 센서리스 제어 시 안정적인 기동성능 확보를 위한 간단한 초기 회전자 위치추정 방법을 제안하였다. 제안된 방법은 전동기의 고정자 권선 인덕턴스의 차이에 의한 전류응답특성을 이용하여 초기 회전자 위치를 추정한다. 이러한 초기 회전자 위치추정 방법은 알고리즘 구현이 간단하고 추가적인 외부회로가 불필요하며, 전동기 상수의 영향을 받지 않는다. 제안된 방법의 타당성은 실험결과를 통하여 검증하였다.

• Journal of Electrical Engineering and Technology
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• 제13권1호
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• pp.201-210
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• 2018

This paper proposes a new start-up method for a load commutated inverter (LCI) in a large synchronous gas-turbine generator. The initial rotor position for start-up torque is detected by the proposed initial angle detector, which consists of an integrator and a phase-locked loop. The initial rotor position is accurately detected within 150ms, and the angle difference between the real position and the detected position is less than 1%. The LCI system operates in two modes (forced commutation mode and natural commutation mode) according to operating speed range. The proposed controllers include a forced commutation controller for the low-speed range, a PI speed controller and a PI current controller, where the forced commutation controller is connected to the current controller in parallel. The current controller is modeled by Matlab/Simulink, where a six-pulse delay of the thyristor and a processing delay are considered by using a zero-order hold. The performance of the proposed start-up method is evaluated in Matlab/Psim at standstill and at low speed. To verify the feasibility of the method, a 5kVA LCI system prototype is implemented, and the proposed initial angle detector and the system performance are confirmed by experimental results from standstill to 900rpm.

• 전자공학회논문지B
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• 제33B권7호
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• pp.183-188
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• 1996

In this paper, we propose a new method which estimates the initial position of a PM synchronous motor (PMSM) using an incremental ecoder. in cremental encoders are widely used in detecting rotor position since they are inexpensive. At starting procedure, however, the incremental encoders cannot give the information of the absolute rotor position. Hence, additional absolue encoder, which has $60^{\circ}C$ resolutio electrically, and signal lines called U, V, W, have been used in practical systems for starting injection of a high frequency test current. It does not require any additional information such as U, V, W signals for starting procedure and allows for cheap and simple implementation. Experimental results show that the proposed method can estimate the initial rotor positon with higher accuracy than the conventional method using U, V, W signals.

• 전력전자학회논문지
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• 제18권6호
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• pp.556-564
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• 2013

This paper proposes an initial rotor position detecting algorithm of a PM synchronous motor using an incremental encoder. The proposed algorithm estimates the phase offset between the rotor magnetic flux and the Z-pulse of the incremental encoder by applying six aligning mode current control. The absolute rotor position for driving a PM synchronous motor is calculated by using the phase offset of the Z pulse and A, B pulse signals of the encoder. The PMSM drives based on the estimated rotor position is applied to the elevator door system. The door length is measured on line at first setup of the elevator. The speed control for open, close, and reopen of the elevator door is also presented and the proposed algorithm for the elevator door system is verified by experiment.

• 산업기술연구
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• 제34권
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• pp.15-20
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• 2014

Recently, PMSMs(Permanent Magnet Synchronous Motors) have become increasingly popular in various high-performance motor drive applications. However, the high-performance drive of PMSMs needs a position sensor such as a resolver, which increases not only the price of the system but also reduces the system reliability. This paper is on the implementation of sensorless control of a SPMSM, which drives a fan for cooling in appliances. In this paper, the rotor position for high-performance drive of a SPMSM is derived from back electromotive force (EMF) information proportional to the rotor speed. Also, the initial rotor position information for start-up is estimated from a saturation phenomenon of inductance. The validity of the proposed sensorless drives was confirmed by the experiment on the SPMSM drive systems for cooling fans of refrigerators and laptop computers.