• Journal of Advanced Marine Engineering and Technology
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• 제19권3호
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• pp.99-106
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• 1995

PWM(Pluse Width Modulation) induction motor drives are being used in greater numvers through a wide variety of industrial and commercial applications. In this paper, a new speed control algorithm (hybrid algorithm) for induction motor drives that uses regular sampled PWM and harmonic elimination PWM is presented. The hybrid algorithm in implemeted on the computer to obtain solutions from the calculation equations of the width of the pulses and the firing angles for the selected harmonic elimination. this paper describes the time delay effects and the suitable compensating methods moreover, optical transmission system for driving signals is proposed and is compared with general trnasmission system. The hybrid inverter was tested with induction motor, and these test results are shown that this hybrid inverter closely approximates and exhibits many of the desirable performance characteristic distortions and eliminated the objectionable harmonics. Finally, detailed experimental investigation of the proposed hybrid scheme in presented.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.816-818
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• 2001

This paper shows the characteristic analysis for an inverter fed induction motor by the 2-D F.E.A. in variation of the air gap length. Harmonic effects of the induction rioter with different air gap length driven by the 6 step voltage of inverter ate investigated. And the results of the characteristic analysis on the inverter fed induction motor are compared with those of sinusoidal voltage fed motor.

• Journal of Advanced Marine Engineering and Technology
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• 제17권5호
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• pp.99-111
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• 1993

In this paper, the current waveform and dynamic characteristics of the proposed system which is composed of a full bridge inverter and low pass LC filter is investigated through the results of computer simulation and experiment to find out the good performance of variable speed AC motor. By the experiment results, it is confirmed that the load current of pseudo sine waves is to be got by the proposed low pass LC filter and the speed of single phase AC motor driven by a full bridge inverter can be smoothly controlled by use of digital PID controller.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제49권12호
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• pp.797-806
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• 2000

In this paper, the torque characteristics and the bar loss distribution are analyzed when a general cage induction motor with skewed slots is fed by a 6-step inverter. For the electromagnetic analysis, time-stepping finite element method is used. And the multi-slice technique and sliding surface technique are respectively utilized to consider the skew effect and the rotation of the rotor. As a result, the effects of skewed rotor bar and the inverter output voltage on the characteristics of the torque and bar loss in the rotor are investigated. The simulation results are verified by measurement of flux density distribution axially in the stator teeth.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 B
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• pp.675-677
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• 2000

In the paper the eddy current loss in brushless DC motor due to switching frequency supplied by PWM inverter, is analyzed. The compensated conductivity is used in order to analyze the eddy current loss in brushless DC motor which has lamination structure. The eddy current loss is deceased when switching frequency supplied by PWM inverter is gradually increased from 1.2kHz up to 12kHz. The high switching frequency of PWM inverter make the output wave into a similar sine wave and this leads to the decreasing eddy current loss.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2009년도 춘계학술대회 논문집
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• pp.76-79
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• 2009

This paper presents analyses and performance evaluations of a PWM inverter for a permanent magnet synchronous motor drive under open fault conditions caused by the open fault in one switching device or isolation between the inverter and motor terminal. A fault model for a PWM inverter is derived and experiment is carried out by using DSP TMS320F28335 to provide the basis of fault diagnosis for such a case.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1993년도 하계학술대회 논문집 B
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• pp.731-735
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• 1993

When induction motor is driven with a load commutated inverter, the output part of the inverter must be capacitive. But, in order to be a good load commutation at the low speed range, very large capacitor or force commutated circuit must be used regarding the capacity of motor. This paper proposed the force commutated circuit for driving the motor in case of the installation of capacitor which can be capable of load commutation at the rating speed. The force commutated circuit is operated by the LC resonant circuit, auxiliary source and SCR, and also composed of the commutation circuit which control the interval of the inverse voltage across the inverter.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2006년도 춘계학술대회
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• pp.551-554
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• 2006

An inverter system which consists of three bi-directional buck-boost converters, is proposed for motor driving. Three phase sinusoidal output voltages can be generated by utilizing three buck-boost converters. The advantage of this scheme is that it does not require a separate DC-DC converter for motor driving, i.e. inverter function is combined into the three DC-DC converters. This topology is suitable for inverters for hybrid or fuel cell vehicles where DC link voltage is subject to change depending upon charging status or output power. So the proposed system is capable of driving motor at high speed. The converter system is controlled by PI controller and simulation results done by MATLAB SIMULINK are provided.Ҙ?⨀ሉȀ̀㘰々K䍄乍?ጊ츀Ѐ㔹〻Ԁ䭃䑎䴀

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.939-940
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• 2011

This paper deals with the design of a brushless synchronous motor with an inverter integrated rotor instead of a brush and a slip ring. It is designed for 80kW output power and compared with an induction motor and a permanent magnet synchronous motor of the same specifications. Brushless synchronous motor, induction motor and permanent magnet synchronous motor have the same amount of magnet flux density at an air gap. As a result, the brushless synchronous motor can be reduced volume of motor and power losses comparing to the induction motor.

• 한국산학기술학회논문지
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• 제15권3호
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• pp.1685-1690
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• 2014

본 논문에서는 유도전동기 벡터제어 인버터에서 상전류를 검출할 때 발생하는 측정 오차를 실시간으로 보상하는 방법을 제안한다. 전류측정에 오프셋 오차와 변환이득 오차가 포함될 경우의 3상 유도전동기 토크 방정식을 유도하여 이러한 측정 오차들이 전동기의 토크 리플을 유발하는 것을 보였으며, 이러한 토크 리플을 제거할 수 있는 방법을 제시하였다. 특히, 본 논문에서는 전동기의 운전 상태에서 실시간으로 변환이득 오차에 의한 토크 리플을 제거하는 방법을 제안하였다. 이를 200[W]급 3상 유도전동기의 벡터제어 인버터에 적용하여 컴퓨터 시뮬레이션 및 실험을 수행함으로써 제안된 방법의 유효성을 검증하였으며, 그 결과 전류측정에서 변환이득 오차가 있더라도 전동기의 토크가 상당히 제거되는 것을 확인하였다.