• 제목/요약/키워드: Inductance measurement

검색결과 144건 처리시간 0.025초

SRM의 센서리스 구동 (Sensorless Control of SRM)

  • 이주현;박성준;안진우
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2004년도 전력전자학술대회 논문집(1)
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    • pp.228-230
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    • 2004
  • This paper describes a new method of detecting rotor position in switched reluctance motor(SRM). Some strategies of position sensorless control methods for the motor include the measurement of phase current and applied pulse voltage in an unexcited phase. The principle of the estimation of a rotor position is based on the detection of inductance by pulse currents. Suggested method is verified by some experimental tests.

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SRM의 비선형적인 인덕턴스 측정방법 (Non-linear Inductance Measurement of a Switched Reluctance Motor(SRM))

  • 노정민;김재혁
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2015년도 제46회 하계학술대회
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    • pp.824-825
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    • 2015
  • 본 논문은 Switched Reluctance Motor(SRM)의 보다 정확한 제어를 위한 인덕턴스 측정에 대해 설명한다. 기존의 인덕턴스 측정방법에는 등가회로를 이용하여 측정하는 방법과 시정수를 이용하여 측정하는 방법이 사용되어왔고 본 논문에서는 기존의 인덕턴스 측정방법과 자동화된 전압적분법을 이용하여 인덕턴스를 측정하였고 실제 측정 데이터 및 유한요소해석(FEA : Finite Element Analysis) 데이터와의 비교를 통하여 타당성을 입증하였다.

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고정밀도 솔레노이드 방식의 원자로 제어봉 위치지시기 (High Precision Solenoid Type Nuclear Reactor Control Rod Position Indicator)

  • 백민호;홍훈빈;박희준
    • 전기학회논문지
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    • 제65권11호
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    • pp.1848-1853
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    • 2016
  • Control Rod Position Indicator in nuclear reactor vessel has developed for small reactor in Korea. Because of severe environment in reactor vessel, target of this study is to develop the suitable position indicator. In this study, solenoid type position indicator made of Mineral Insulated Cable(MI Cable) was introduced to adapt in severe environment. And inductance of the solenoid was used to indicate the rod position for high precision. But problem of this concept is that a linear slope of inductance is changed by temperature effect. To resolve this problem, two sensing coils were introduced for temperature compensation. A role of the sensing coil is to make reference linear equation about certain temperature. To confirm this concept, also, inductance of solenoid and sensing coils were measured at room and high temperature (${\sim}300^{\circ}C$). The results of measurement show that the position error of sensing coil between room and high temperature was about 2%. But it was identified that this error was resulted from insufficient test environment (temperature error between solenoid and sensing coils was about 2% at high temperature condition). Therefore, solenoid type position indicator shows that it is very suitable in reactor vessel as a high precision rod position indicator.

Radio Frequency 회로 모듈 BGA 패키지 (Electrical Characterization of BGA interconnection for RF packaging)

  • 김동영;우상현;최순신;지용
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2000년도 하계종합학술대회 논문집(2)
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    • pp.96-99
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    • 2000
  • We presents a BGA(Ball Grid Array) package for RF circuit modules and extracted its electrical parameters. We constructed a BGA package of ITS(Intelligent Transportation System) RF module and examined electrical parameters with a HP5475A TDR(Time Domain Reflectometry) equipment and compared its electrical parasitic parameters with PCB RF circuits. With a BGA substrate of 3 $\times$ 3 input and output terminals, we have found that self capacitance of BGA solder ball is 68.6fF, self inductance 146pH, mutual capacitance 10.9fF and mutual inductance 16.9pH. S parameter measurement with a HP4396B Network Analyzer showed the resonance frequency of 1.55㎓ and the loss of 0.26dB. Thus, we may improve electrical performance when we use BGA package structures in the design of RF circuit modules.

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높은 격리도와 고속 스위칭의 PIN 다이오드 스위치 (A PIN Diode Switch with High Isolation and High Switching Speed)

  • 주인권;염인복;박종흥
    • 한국전자파학회논문지
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    • 제16권2호
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    • pp.167-173
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    • 2005
  • 직렬 PIN 다이오드 스위치의 격리도는 PIN 다이오드의 병렬 커패시턴스에 의해 제한을 받으며, 스위치 구동회로는 PIN 다이오드 스위치의 스위칭 속도를 제한한다. 이런 문제를 극복하기 위해, 병렬 공진 인턱턴스와 TTL 호환의 스위치 구동회로가 적용된 높은 격리도와 고속 스위칭의 PIN 다이오드 스위치를 제안하였다. 3 GHz PIN 다이오드 스위치의 측정 결과, 1 GHz의 주파수 대역폭, 1.5 dB 이내의 삽입 손실, 65 dB의 격리도, 15 dB 이상의 반사 손실 그리고 30 ns 이내의 스위칭 속도를 나타내었다. 특히, 병렬 공진 인덕턴스를 사용한 3 GHz스위치는 15 dB의 격리도 향상을 나타내었다.

DC-link Capacitor필름 형상에 따른 Joule-heat특성 분석 (Analysis of Joule-heat Characteristics according to the DC-link Capacitor Film Geometrics)

  • 전용원;김영신;전의식
    • 반도체디스플레이기술학회지
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    • 제19권1호
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    • pp.42-48
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    • 2020
  • As global warming accelerates, eco-friendly electric cars are being developed to reduce carbon dioxide emissions, and power conversion inverters are used to drive motors. Among inverter components, DC-link capacitor is heated by high current usage, which causes problems such as performance and life-saving of inverter. Although metal cases with good thermal performance have been used to solve this problem, it is difficult to apply them in practice due to insulation problems with other parts. In this paper, the Heat-Generation influence factor of DC-link capacitor is analyzed. Variables on heat-generation are set at 3 levels for film width, inductance, and film thickness. Box-Behnken to 13 tests using the design and minimal deviations, e.g. through the experiment three times by each level. The surface of the film k type by attaching the sensor current is measured temperature. Capacitance was set to a minimum level of 200 ㎌ and had a frequency of 16 kHz with Worst case, ambient temperature of 85℃ and a ripple current of 50 Ams was applied. The temperature at the measurement point was collected in the data logger after sampling at 1 minute intervals for 2 hours after saturation with the ambient temperature. This experiment confirmed that setup factors are correlated with heat-generation.

마더형 플라즈마 집속장치의 제작과 특성 (Fabrication and Characteristics of Mather Type Plasma Focus System)

  • 김동환;이상수;조성국;김규욱;이민희
    • 한국광학회지
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    • 제1권1호
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    • pp.65-72
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    • 1990
  • 최대 10kJ의 에너지를 공급할 수 있는 Mather형 플라즈마 집속장치를 설계, 제작하였다. 이 DPF 장치의 전기 방전 특성을 알기 위해 Rogowski 코일을 제작하고 방전전류, 전압을 측정하여 본 system 의 저항과 인덕턴스는 각각 $20m\Omega과 0.2{\mu}H로 밝혀졌다. 플라즈마 전류 sheath의 이동속도는 충전개스 압력과 전압에 따라 $P^{-0.25}\timesV^{0.38}$의 함수로 비례하며 집속된 플라즈마의 크기는 직경 3mm, 길이 17mm로 밝혀졌다.

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여자상의 초기 전류증가율 측정에 의한 Switched Reluctance Motor의 Sensorless 알고리즘 (New Sensorless Algorithm for SRM Based on Initial di/dt Measurement of Excited Phase Current)

  • 임준영;;신두진;오재윤;김정철
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1996년도 추계학술대회 논문집 학회본부
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    • pp.302-304
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    • 1996
  • In this paper, a new algorithm for sensorless speed control of switched reluctance motor (SRM) is proposed. It is based on the measurement of initial rate of change of phase current. The initial rate of rise of phase current mainly depends up on the phase inductance at the time instant when the phase is excited. Therefore, the measurement of initial di/dt permits rotor position estimation, which is used to trigger the next phase. In the proposed technique, there is no need to generate additional current pulses when a phase is not excited. Therefore, this scheme does not introduce the unwanted braking torque. Also, only one current measurement is made every time a phase is excited. This reduces the computational load on the micro-controller and enhances the speed range of the sensorless drive. By using this scheme it is possible to implement the sensorless control of SRM using low cost micro-controller.

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교류저항 표준기 제작과 그 특성 (Development and Its Properties of Resistance Standards for Using Alternative Current)

  • 김한준;이상화;강전홍;유광민;한상옥
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2009년도 하계학술대회 논문집
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    • pp.267-268
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    • 2009
  • Resistance standards from 1 ${\Omega}$ to 100 $k{\Omega}$, with calculable frequency dependencies of up to 1 MHz, have been developed for the calibration of commercial inductance-capacitance-resistance (LCR) meters and impedance analyzers. The resistors are designed on the basis of single bifilar loops. The typical resistance change from dc to 1 MHz is from 200 to $800\;{\mu}{\Omega}/{\Omega}$. According to the measurement results, the frequency dependencies of the resistors are severaltimes lower than the measurement uncertainty of commercial LCR meters.

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저전류 영역에서 로고우스키 코일 특성 (Characteristics of Rogowski coil at Low Cutrrent Region)

  • 박정남;이강원;이청;김길수;박영국;강성화;임기조
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2001년도 춘계학술대회 논문집 유기절연재료 전자세라믹 방전플라즈마 연구회
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    • pp.47-50
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    • 2001
  • Conventionally, air-cored Rogowski coil was designed for use as high alternating and transient current sensor without saturation caused by ferromagnetic material in its core. This paper investigated that Rogowski coil can be applied to low current measurement in 60Hz power line. Measured parameters R, L of coil were compared with theoretically calculated values. Output voltages crossed by Rogowski coil have shown some linearity according to input current(tens to thousands of amperes) passing through it. And also shielding effect for external noises was investigated for three cases.

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