• 전기학회논문지
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• 제57권12호
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• pp.2208-2212
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• 2008

This paper deals with the cost reduction design of a single-phase line-start permanent magnet(LSPM) motor. Due to high cost of the permanent magnet(PM), cost reduction can be effectively achieved by reducing PM volume. Therefore, motor characteristics according to the PM volume are calculated by using d-q axis equivalent circuit analysis, and the characteristic map is made. In the characteristic map, maximum torque and efficiency are shown according to motor parameters such as back electromotive force(back emf) and inductances; back emf represents the PM volume. Minimum back emf and inductances satisfying output performance are determined in the characteristic map. Then, motor geometry based on the prototype motor is optimized to get the determined parameters using response surface methodology(RSM) and finite element method(FEM). Through the presented cost reduction design, total PM volume is reduced to 32% of prototype model.

• Journal of Power Electronics
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• 제9권6호
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• pp.911-918
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• 2009

This paper presents a new sensorless control method for single-phase switched reluctance motors using induced electromotive force (EMF) due to the residual flux both on the stator and the rotor during phase commutation. The induced EMF falls to zero when the rotor pole moves away from the overlap with the stator pole. By detecting this instant, the speed and position of the rotor can be simply estimated. This method is very simple to implement and it is insensitive to variations in the system parameters as it does not require any stored magnetic data or offline inductance measurements but requires only measurements of the terminal voltage and a simple analog circuit. The proposed method is implemented on a 6/6 single-phase switched reluctance motor. However, it can also be implemented on a multiphase SRM regardless of the size, operation speed and switching mode of the motor hence making the proposed method viable to many applications. Simulation and experimental verification is provided to demonstrate the feasibility of the proposed method.

• 전기학회논문지P
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• 제53권2호
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• pp.58-64
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• 2004

Most of the loads in industrial power distribution systems are balanced and connected to three power systems. However, in the user power distribution systems, most of the loads are single & three phase and unbalanced, generating voltage unbalance. Voltage unbalance is a condition in a polyphase system in which the rms values of the line-to-line voltages or the phase angles between consecutive line-to-line voltages, are not all equal. Slight voltage unbalance generates a disproportionately high current unbalance at the motor stator winding. This paper presents a scheme on operation states of a three-phase induction motor under unbalanced voltages. The three-phase voltages applied to the stator winding of the studied induction motor are controlled by respectively adjusting the magnitude and phase angle of each phase. The voltage unbalanced factor(VUF) of the three-phase source voltages can then be varied to examine the different values of VUF on machine's operation characteristics.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.77-79
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• 2007

In previous structure of single phase LSPM, there is large torque ripple that makes a noise and a vibration by a distortion of flux distribution in air gap. By this reason, the single phase LSPM is not accepted home applications. So, in this paper, we propose new structure of single phase LSPM(Line Start Permanent magnet Motor). The proposed model is reduced a torque ripple about a half than previous model.

• 전기전자학회논문지
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• 제22권2호
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• pp.258-265
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• 2018

본 논문은 단상 유도전동기의 기동 시 발생하는 기동전류를 분석하고 이를 저감하기 위한 알고리즘을 제안한다. 일반적으로 단상 유도전동기는 구조적인 특성으로 인해 기동토크를 발생시킬 수 있는 별도의 기동장치가 요구된다. 본 논문에서 사용되고 있는 방법은 커패시터-기동/커패시터-운전 방식이며 타 방식 대비 기동토크가 크고 운전효율이 높은 특성이 있다. 하지만 초기 기동 시 약 5~6배에 해당되는 돌입전류가 발생하며 이로 인한 초저온 냉동고 기동 소자와 주변기기들의 소손 및 수명 저하의 원인이 된다. 기동 시 발생하는 돌입전류를 저감하기 위하여 가상 dq모델 기반의 전류제어 알고리즘을 적용하여 기동 전류를 제한하고, 정격운전에 도달 시 상용전원과 동일한 운전조건으로 전환하기 위한 알고리즘을 실험을 통하여 그 타당성을 검증한다.

• 조명전기설비학회논문지
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• 제15권3호
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• pp.18-24
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• 2001

본 연구에서는 단상 PWM 컨버터와 3상 PWM 전압형 인버터 유도전동기 운전으로 나누 어져 있다. 단상 시스템의 교류 전원의 주파수에는 순시전력의 맥동성분을 가진다. 컨버터의 직류 맥동전압은 맥동성분을 발생시킨다. 결과적으로 인버터의 출력전압과 전류의 파형은 왜곡된다 시스템의 정상상태는 상태공간법으로 해석된다. 이러한 모든 사항은 시뮬레이션과 실험을 통하여 그 타당성을 확인하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.907-909
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• 2001

This paper proposes the analysis method for the pole change motor that is a capacitor-run single-phase induction motor. As the Magneto motive force(MMF) at 2-role becomes severe distortion, it is necessary to consider the harmonics for the characteristic analysis of the motor. Therefore, the performance of motor is analyzed by equivalent circuit considering the harmonic components. The validity of the proposed analysis method for the pole change motor is verified through simulations and experimental results.

• 전기의세계
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• 제22권2호
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• pp.33-39
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• 1973

This paper presents numerical analysis by omputer for the steady state characteristics of the single phase reluctance motor driven by the bridge type SCR inverter and also the experiments were carried out to verify the numerical analysis data for the current, voltage, and torque of the motor. It shows that the inductance of the inverter, the capacity of the commutation condenser and the frequency of the inverter have great effects to the magnitude and wave form of the motor terminal voltage and current. It is clear that the capacity of the commutation condenser and the inductance of the inverter circuit have to be adequately selected in order to stabilize the motor operation.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(2)
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• pp.671-676
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• 2003

This paper presents 3-phase current regulation of SR motor by only single current sensor. The conventional drive system of SR motor has a current sensor per each phase. In this paper, The asymmetric bridge converter which Is able to control independently phases and be excited simultaneously is used fs the driver system for 6/4 poles SR motor. And the sensor Is replaced 3 sensors of each phase with only one on bus line of converter so as to detect current of every phase. A drive logic circuit is designed on EPLD with Delta modulation using a fixed frequency This technique is verified through simulation and experiment.

• 전기의세계
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• 제19권3호
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• pp.10-17
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• 1970

The main focus of this paper is the analysis on the controlling characteristics of self-excited D.C. motor driven by thyristor chopper. The controlling characteristics of short shunt compound motor driven by poly phase multiple thyristor chopper is better than that of driven by single phase thyristor chopper. And we got the following conclusions. A. Motor current capacity could be increased by the multiplicity n increase. B. Speed-torque characteristics is linear and adquate for constant Horsepower motor. C. Maximum current Riple ratio is proportional to almost inverse m$^{2}$. Also here shows the stable conditions and semiconducterlize datas for controlling the self-excited D.C. motor driven by thyristor chopper.