• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2008년도 추계학술대회 논문집
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• pp.307-310
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• 2008

This paper is proposed the vector control of 3-phase induction motor drive system by photovoltaic generation. For performance of vector control using a current control voltage source inverter(CC-VSI). CC-VSI is controlled by torque and flux producing component of motor current, relating with current and voltage value of photovoltaic arrays at maximum power point that varies follow different level of insolation. The MPPT using a DC-DC converter controlled the duty cycle to track maximum power from PV under different insolation conditions. The simulation results are shown that the characteristics and performance of drive system, which varies as each conditions of light by expresses in voltage($V_{dq}$), current($I_{dq}$), speed of motor and torque.

• Journal of Power Electronics
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• 제11권6호
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• pp.824-836
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• 2011

A new fault-tolerant control topology for open-loop motor-drive systems with Delta-connected stator windings is introduced in this paper. This new control topology enables the operation of a three-phase induction machine as a two-phase machine fed by a three-phase inverter upon a failure in one of the motor phases. This topology utilizes the "open-Delta" configuration to independently control the current in each of the two remaining healthy phases. This new control technique leads to the alleviation of any torque pulsations resulting from the consequences of the asymmetrical conditions associated with this class of faults.

• 전력전자학회논문지
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• 제15권1호
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• pp.43-51
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• 2010

본 논문에서는 고전압 전동기 가변속 장치인 H-브릿지 멀티레벨(H-Bridge Multi-Level; HBML) 인버터를 이용한 유도 전동기 벡터 제어시 인버터의 출력 전압 위상 지연 현상을 해석하고 전류 제어기의 보상 기법을 제시하였다. Phase-Shifted Pulse Width Modulation (PSPWM) 기법을 적용한 HBML 인버터는 개별 인버터 모듈이 독립적으로 동작할 수 있어서 확장성과 모듈화 능력이 향상되는 장점이 있다. 그러나 이러한 PSPWM을 적용한 HBML 인버터는 기준 전압과 실제 전압 사이에 위상 차이가 있기 때문에 출력 주파수에 대한 샘플링 주파수의 비율이 충분하지 않은 고속 영역에서 전류 제어기를 불안정하게 하는 원인이 된다. 전류 제어기의 불안정성은 기준 전압과 출력 전압의 위상 차이를 보상하는 제안된 방법을 추가함으로써 제거하였다. 본 방법은 인버터의 스위칭 주파수가 낮고, 전동기 속도가 높은 조건에서 PSPWM을 이용한 HBML 인버터 시스템에 효과적이며, 13레벨로 구성된 HBML 인버터로 구동되는 6,600[V] 1,400[kW] 유도전동기 실험을 통해 제안된 방법의 타당성을 입증하였다.

• 조명전기설비학회논문지
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• 제26권1호
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• pp.66-74
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• 2012

This paper propose a improved direct torque control(DTC) system for improving operation of five-phase squirrel-cage induction motor(IM). A five-phase IM drives present unique characteristics due to the additional degrees of freedom and also drives possess many others advantage compared with the traditional three-phase motor drive system, such as reducing a amplitude of torque pulsation and increasing the reliability. In order to maximize the torque per ampere, the proposed motor has concentrated windings and the produced back-electromotive force(EMF) is almost trapezoidal, and the motor is supplied with the combined sinusoidal plus third harmonic of currents, there is necessary to controlled 3rd harmonic current. Also a DTC method is advantageous when it is applied to the five-phase IM, because the five-phase inverter provides 32 space vectors in comparison to 8 space voltage vectors into the three-phase inverter drive system. For presenting the superior performance of the proposed DTC, experimental results of speed control are presented using a 32-bit fixed point TMS320F2812 DSP with 1.5[hp] IM.

• 한국조명전기설비학회지:조명전기설비
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• 제2권2호
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• pp.64-70
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• 1988

교류 전동기의 가변속 구동에 있어서, 가변전압, 가변주파수 방식의 PWN 인버터가 널리 사용되고 있다. 본 연구에서는 3상 PWN 인버터의 출력 파형에 있어서 특정고조파제거를 위한 방법이 소개되며 그 타당성을 입증하기 위해 실험결과는 시뮬레이션 결과와 비교·검토된다. 제안된 PWN 방식은 유도 전동기뿐만 아니라 전압 조정기, UPS 등에도 사용 가능하다.

• 대한전기학회논문지
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• 제37권9호
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• pp.600-608
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• 1988

Although the structure of brushless dc motor is similar to that of a Permanent magnet synchronous motor, its torque-speed characteristcis are the same as those of a permanent magmet dc motor. The brushless dc motor drive systemcomposed of power converter including inverter, rotor positioning sensor and controller has been investigated for the purpose of position control when the motor is fed by a current controlled voltage source inverter. The equivalent transformation of a brushless dc motor into an separately exited dc motor has been possible with the vector control (field oriented control) technique. It is shown in this paper that the position control of a brushless dc mitor can be done fairly accurately only using q-axis current.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1993년도 정기총회 및 추계학술대회 논문집 학회본부
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• pp.163-165
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• 1993

This study describes the influence of the mutual inductance between the adjacent phase windings of variable reluctance motor[VRM] and presents a new type of inverter for reduction of such influence. In this inverter topology, though an additional power switch is used as compared with the conventional C-dump inverter circuit, unwanted negative torque produced by the mutual inductance is remarkably reduced. Hence, the circuits results in increase of the average torque and contributes to the improvement of overall drive efficiency. Theoretical prediction is verified by experimental results obtained with the integration of presented inverter and prototype 6/4 VRM.

• 전력전자학회논문지
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• 제21권2호
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• pp.117-125
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• 2016

In this paper, the inverter switch losses of BLDC motor for three types of PWM methods and power devices were analyzed. When the BLDC motor is driven at low currents, the inverter switch losses for MOSFET are low because MOSFET operates like resistance. However, the inverter switch losses for IGBT are higher than MOSFET due to its large turn-off losses. Moreover, synchronous rectification switching method is adaptable because MOSFET has 2-channel. So, MOSFET can be driven with more low impedance and losses. For low power inverter with MOSFET, the power losses of unified PWM are lower than that of unipolar and bipolar PWM. Proposed method and losses analysis results are verified by examination and simulation using Matlab/Simulink.

• 한국산학기술학회논문지
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• 제17권7호
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• pp.492-498
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• 2016

운전 중인 유도전동기에 고장이 발생하면, 구동장치 등 전체 시스템에 2차적인 고장을 유발 시킬 수 있다. 이 경우 구동시스템의 신뢰도와 안전성이 저하되고, 경제적인 손실을 초래할 뿐만 아니라, 인명 피해의 위험 등 많은 문제가 발생할 수 있다. 따라서 유도전동기의 고장징후를 조기 감지하여 전체 시스템 고장을 방지할 수 있도록 하는 유도전동기 고장진단 방법이 필요하다. 본 논문은 유도전동기에서 고정자권선의 부분 단락과 회전자 바의 균열이 발생하는 경우, 인버터 입력전류를 분석하여 고장징후를 조기 감지하는 유도전동기 고장진단 방법을 제안한다. 제안한 고장진단 방법은 고정자 전류 3개를 모두 센싱해야 하는 기존 고장진단 방법과 달리, 인버터 입력전류 센서 한 개만으로 유도전동기 고장진단이 가능하다. 또한, 정상전류 주파수성분과 고장전류 주파수성분이 서로 분리되어 나타나는 인버터 입력전류 특성을 통해 기존 고장진단 방법보다 비교적 쉽고 확실한 고장진단이 가능하다. 시뮬레이션을 통하여 제안한 유도전동기 고장진단 방법의 우수성과 유효성을 확인한다.

• Journal of Advanced Marine Engineering and Technology
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• 제13권3호
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• pp.56-63
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• 1989

In recent years, a.c servo motors have been gradually replacing d.c sevo motors in various high-performance demanded aplications such as machine tools and industrial robots. In particular, the high-performance slip-frequency control of an induction motor, which is often called the vector control, is considered one of the best a.c drive. In this paper, the transient state equation and vector control algrithms of an induction motor are described mathematically by using the two-axis theory(d-q coordinates). According to the result of these algorithms, we scheme the speed control system for an induction type ac servo motor in which vector control is adopted to give tha a.c motor high performance. Motor drive is a PWM inverter using power MOS-FET, and is controlled in order to let the actual input current of the motor track the current reference obtained from a microcomputer(8086 cpu). Driving experiments are performed in the range of 0 to 3000 rpm, and it is verified that high speed response is possible.