• 대한전기학회논문지
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• 제45권4호
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• pp.526-529
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• 1996

A novel control scheme for a Switched Reluctance Motor(SRM) drive is described. To increase torque, and to commutate easily, flat-topped phase current and fixed switching angle control is proposed. The conditions for flat-topped phase current are analyzed. It is achieved by voltage control with fixed switching angle. The proposed control system was tested to verify this suggestion. (author). refs., figs., tab.

• 한국인터넷방송통신학회논문지
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• 제23권4호
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• pp.143-148
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• 2023

SRM의 특성 중 비선형성으로 인해 최대토크 및 최소 토크 맥동 형성을 위한 적정 운전이 어렵다. 또한 고정 스위칭각 제어 때 속도 가변에 따른 토크 형성이 불안정하여 효율을 저하시키는 문제점을 가지고 있다. 따라서 속도 가변에 따른 능동적인 스위칭각 제어가 필요하다. 본 논문에서는 SRM의 비선형성으로 인한 문제점으로부터 선행각 (Advance angle)의 자동제어에 의한 토크 리플 저감과 이에 따른 출력 토크 향상에 의한 구동 성능개선을 위한 방법에 대해 모색하였다. 또한 히스테리시스 전류제어기 성능에 따른 스위칭 가변으로 인한 SRM의 최적 운전에 대해 살펴보았다.

• 대한전기학회논문지
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• 제45권1호
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• pp.54-59
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• 1996

As the current shape of SRM is of pulse type and changed by the motor parameters and drive conditions, the influences on the drive efficiency by control method are more than other types of motors. In this paper, a proper excitation condition to drive a SRM with high efficiency is proposed and tested. It is derived from the conditions that the phase current of a SRM is to be flat-topped at various drive. The saturation effect of magnetic circuit is accounted for more accurate analysis. Experimental tests are executed to verify the proposed excitation method. This drive system is easy to commutate and also advantageous in reducing torque ripple. (author). 6 refs., 10 figs., 1 tab.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(2)
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• pp.677-680
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• 2003

The control of the SRM(Switched Reluctance Motor) is usually based on the non-linear inductance profiles with positions. So determination of optimal switching angle is very different. we present self-tuning control of SRM for maximum torque and efficiency with phase current and shaft position sensor During the sample time, micro-controller checks the number of pre-checked pulse. After micro-controller calculates between two data, it move forward or backward turn-off angle. When the turn-off angle is fixed optimal turn-off angle, turn-on angle moves forward or backward by a step using self-tuning control method. And then, optimal turn-off angle is searched once again. As such a repeating process, turn-on/off angle is moves automatically to obtain the maximum torque and efficiency. The experimental results are presented to validate the self-tuning algorithm.

• 전기학회논문지
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• 제57권8호
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• pp.1356-1361
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• 2008

A switched reluctance generator(SRG) has simple magnetic structure, and needs simple power electronic driving circuit. But, a SRG are no windings or permanent magnets on the rotor, and there are concentrated windings placed around each salient pole on the stator. Because of the characteristics of time-sharing excitation, the control of SRG is very flexible. And there are several parameters for controlling SRG, such as switch turn-on angle, switch turn-off angle, and exciting voltage and controlling mode, all these will affect the generation greatly. A SRG has positive torque at increasing inductance region and negative torque at decreasing inductance region. In this paper, we studied characteristics about the switch turn-on and off angles according to switch method for constant output voltage of the fixed speed SRG. It is the acoustic noise and torque ripple characteristics. Characteristics for a switch angle and method are presented by experiment using a 50W SRG with 12/8 poles.

• Journal of Power Electronics
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• 제15권1호
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• pp.190-201
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• 2015

This paper uses the switching function approach to present a simple state model of the Vienna-type rectifier. The approach introduces the relationship between the DC-link neutral point voltage and the AC side phase currents. A novel direct power control (DPC) strategy, which is based on the sliding mode control (SMC) for Vienna I rectifiers, is developed using the proposed power model in the stationary ${\alpha}-{\beta}$ reference frames. The SMC-based DPC methodology directly regulates instantaneous active and reactive powers without transforming to a synchronous rotating coordinate reference frame or a tracking phase angle of grid voltage. Moreover, the required rectifier control voltages are directly calculated by utilizing the non-linear SMC scheme. Theoretically, active and reactive power flows are controlled without ripple or cross coupling. Furthermore, the fixed-switching frequency is obtained by employing the simplified space vector modulation (SVM). SVM solves the complicated designing problem of the AC harmonic filter. The simplified SVM is based on the simplification of the space vector diagram of a three-level converter into that of a two-level converter. The dwelling time calculation and switching sequence selection are easily implemented like those in the conventional two-level rectifier. Replacing the current control loops with power control loops simplifies the system design and enhances the transient performance. The simulation models in MATLAB/Simulink and the digital signal processor-controlled 1.5 kW Vienna-type rectifier are used to verify the fast responses and robustness of the proposed control scheme.

• 한국조명전기설비학회지:조명전기설비
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• 제10권6호
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• pp.81-87
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• 1996

본 논문은 SRM 의 가변속 구동을 위한 디지털 방식 인버터에 관한 연구이다. 전동기의 속도제어를 위해 고정스위치각과 가변전압제어방식을 사용하였으며 이는 평탄 상전류를 얻어 토오크 맥동을 저감하고 상제어를 위한 위상각 제어를 하지 않아 제어시스템을 단순하게하는 장점을 가진다. 8097마이크로콘트롤러를 이용하여 제어시스템을 디지털화, 소형화하고 제어의 유연성을 높였다.

• 한국산업융합학회 논문집
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• 제23권2_1호
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• pp.115-124
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• 2020

In wireless power transfer (WPT) system, the conventional compensation topologies only can provide a constant current (CC) or constant voltage (CV) output under their resonant conditions. It is difficult to meet the CC and CV hybrid charging requirements without any other schemes. In this study, a switching hybrid topology (SHT) is proposed for CC and CV electric vehicle (EV) battery charging. By utilizing an additional capacitor and two AC switches (ACSs), a double-side LCC (DS-LCC) and an inductor and double capacitors-series (LCC-S) topologies are combined. According to the specified CC and CV charging profile, the CC and CV charging modes can be flexibly converted by the two additional ACSs. In addition, zero phase angle (ZPA) also can be achieved in both charging modes. In this method, because the operating frequency is fixed, without using PWM control, and only a small number of devices are added, it has the benefits of low-cost, easy-controllability and high efficiency. A 3.3-kW experimental prototype is configured to verify the proposed switching hybrid charger. The maximum DC efficiencies (at 3.3-kW) of the proposed SHT is 92.58%.

• 대한기계학회논문집A
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• 제38권11호
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• pp.1309-1315
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• 2014

자기부상열차에 있어서 분기기는 차량이 가이드레일과 접촉 없이 안전하게 노선을 변경할 수 있도록 설계돼야 한다. 특히, 별도의 안내 전자석이 없이 하나의 U-형 전자석으로 부상력과 안내력을 동시에 얻는 중저속 상전도흡인식 자기부상열차에 있어서는 분기기 통과시 안전성에 대한 검토가 요구된다. 이 방식에서는 안내력을 능동적으로 제어하지 않기 때문에 작은 곡률 반경이면서도 다수의 직선을 연결하여 곡선을 형성하는 관절형 분기기 통과시 전자석의 횡공극이 과도하게 발생하여 가이드레일과 기계적 접촉을 일으킬 수 있기 때문이다. 본 논문에서는 개발 중인 관절식 분기기에서 차량의 주행안전성 향상을 위하여 관절식 분기기의 주 설계 변수의 안전성에의 영향을 분석하는데 목적이 있다. 그를 통하여 분기기에서의 주행안전성을 향상하고자 한다. 이를 수행하기 위하여 2 량 1 편성으로 구성된 3 차원 전체차량 다물체 동역학 모델의 적용이 제안된다. 제안된 모델을 이용하여 분기기 통과시의 주행안전성척도 중의 하나의 횡공극 시뮬레이션이 이루어진다. 분석되는 설계 변수들은 단경간 거더의 길이와 굴절각, 끝단 고정궤도 중심 사이의 거리, 거더의 수량이다. 이러한 설계 변수들의 영향을 분석하여 안전성 향상을 위한 분기기 설계 방향을 제시한다.