• 제목/요약/키워드: Stator winding

검색결과 425건 처리시간 0.028초

세라믹 커플러를 이용한 고전압회전기 고정자권선의 On-line 및 off-line 부분방전 특성 시험 및 분석 (Analysis and lest of On-line and off-line PD Testing for High Voltage Rotating Machines Stator Windings using Ceramic Coupler)

  • 오봉근;김현일;강성화;임기조
    • 한국전기전자재료학회논문지
    • /
    • 제20권10호
    • /
    • pp.895-900
    • /
    • 2007
  • Partial discharge(PD) test can be performed either when the rotating machine is not operating(off-line) or during normal machine operation(on-line). This paper presents an on-line and off-line PD test on a large hydro-generator and induction motor using the same PD acquisition system(PDAS) and ceramic coupler(CC) sensor. PD signal characteristics of CC sensor proved similar with that of epoxy mica coupler(EMC) sensor as a results of PD test for simulated defect winding and frequency response test. A comparison of on-line and off-line PD test for PD characteristic parameters-phase resolved PD(PRPD), maximum PD value(Qmax) and PD occurrence energy(POE)-indicated that on-line PD test could reliably and effectively diagnose insulation conditions which were verified by off-line PD test.

마이카-에폭시 절연재료의 열화특성분석 (The Aging Characrteristic Analysis of Mica-Epoxy Insulation Materials)

  • 유영식;김희곤;송우창;이재형;박용관
    • 한국전기전자재료학회논문지
    • /
    • 제11권2호
    • /
    • pp.82-89
    • /
    • 1998
  • The experimental results using the X -ray technique, the position and structure of mica crystal are not observed the phase change of aging and sound specimen respectively. However, We could observe the intensity difference of crystal element in both atmospheres. The analysis of mica-epoxy materials by optical microscope are shown that the each surface of sound and aging specimens are different in both atmospheres Also, the experimental results have shown that the potassium ions of mica cristal are substituted by hydrogen ions at boundary area of mica-epoxy and/or mica-mica. On components made of mica, a potassium ion of big atomic radius, is replaced by hydrogen ion of small atomic radius. The voids are created by the difference of radius progressed by combined stresses. Through these phenomena, it has been proposed that the conductive layers made of potassium enable the voids to form and the cracks to create by high electric field.

  • PDF

양측식 영구자석 가동형 슬롯리스 직선 동기전동기의 전자기 특성 및 동특성 해석에 의한 설계정수 도출 (Extraction of Design Parameters through Electromagnetic and Dynamic Analysis of Slotless Double-side PMLSM system)

  • 장원범;이성호;장석명;유대준
    • 전기학회논문지
    • /
    • 제56권12호
    • /
    • pp.2135-2144
    • /
    • 2007
  • This paper presents system design of the slotless double-side Permanent Magnet Linear Synchronous Machine system (PMLSM) through magnetic field analysis and dynamic modeling. In our analysis, 2-D analytical treatments based on the magnetic vector potential were adopted to predict magnetic field with space harmonics by PM mover magnetization and stator winding current. From these, the design parameters such as inductance, Back-emf, and thrust are estimated. And, the electrical dynamic modeling including synchronous speed is completed by calculation of a DC link voltage in effort to obtain the accurate mechanical power from Space Vector Pulse Width Modulation(SVPWM). Therefore, the system design of PMLSM is performed from estimation of design parameters according to PM size and coil turns in magnetic field and from calculation of a DC link voltage to satisfy base speed and base thrust represented as the maximum output power in dynamic modeling. The estimated values from the analysis are verified by the finite element method and experimental results.

송풍기용 고속 2상 6/5 SRM의 설계 및 특성해석 (Design and Characteristics of High Speed 2-Phase 6/5 Switched Reluctance Motor for Air-blower Application)

  • 팜쭝히웨;이동희;안진우
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2015년도 제46회 하계학술대회
    • /
    • pp.673-675
    • /
    • 2015
  • This paper presents a design of a high speed 2-phase 6/5 switched reluctance motor (SRM) for an air-blower application. This type of motor is suitable for the applications that require high speed and only one directional rotation as air-blower. The desired air-blower is unidirectional application, and requires a wide positive torque region without torque dead-zone. In order to get a wide positive torque region without torque dead-zone during phase commutation, asymmetric inductance characteristic with non-uniform air-gap is considered. The proposed motor can be operated at any rotor position. The proposed 6/5 SRM uses short flux path technique that achieved by means of winding configuration and lamination geometry. The purpose of short flux path is to reduce the core loss and the absorption MMF in the stator. The proposed 2-phase 6/5 SRM is verified by finite element method (FEM) analysis and Matlab-Simulink. In order to verify the design, a prototype of the proposed motor was manufactured for practical system.

  • PDF

연 풍력시스템의 회전속도 측정 및 발전기 시스템에 적용 가능한 영구자석 발전기 설계에 관한 연구 (Study on Rotating Speed of Kite Wind Turbine System and Design of PM Generator)

  • 신유정;김수현;김진호
    • 한국기계가공학회지
    • /
    • 제15권4호
    • /
    • pp.141-147
    • /
    • 2016
  • A direct PM generator has the effect of reducing the mechanical noise and ease of maintenance by eliminating a number of power transmission components. In addition, wind turbines operating at low speed with the advantages of high output, high efficiency, and small size. The generator was designed as a small direct-drive PM generator that can be applied to a kite even at low wind speeds. The RPM (Revolutions Per Minute) of the reel was measured in two ways using a cadence/speedometer sensor and a tachometer while the actual kite. The RPM derived from the experiment was applied to the simulation on the designed generator. The no-load characteristic analysis for the magnetic fields produced for the permanent magnet generator by a permanent magnet and stator winding currents is achieved using a 2D coordinate system. A commercial electromagnetic analysis program, ANSYS Maxwell, was used to model the electromagnetic dynamics.

Multi-Domain Model for Electric Traction Drives Using Bond Graphs

  • Silva, Luis I.;De La Barrera, Pablo M.;De Angelo, Cristian H.;Aguilera, Facundo;Garcia, Guillermo O.
    • Journal of Power Electronics
    • /
    • 제11권4호
    • /
    • pp.439-448
    • /
    • 2011
  • In this work the Multi-Domain model of an electric vehicle is developed. The electric domain model consists on the traction drive and allows including faults associated with stator winding. The thermal model is based on a spatial discretization. It receives the power dissipated in the electric domain, it interacts with the environment and provides the temperature distribution in the induction motor. The mechanical model is a half vehicle model. Given that all models are obtained using the same approach (Bond Graph) their integration becomes straightforward. This complete model allows simulating the whole system dynamics and the analysis of electrical/mechanical/thermal interaction. First, experimental results are aimed to validate the proposed model. Then, simulation results illustrate the interaction between the different domains and highlight the capability of including faults.

A Study on the Breakdown Mechanism of Rotating Machine Insulation

  • Kim, Hee-Gon;Kim, Hee-Soo;Park, Yong-Kwan
    • Journal of Electrical Engineering and information Science
    • /
    • 제2권3호
    • /
    • pp.71-76
    • /
    • 1997
  • A lot of experiments and analyses have been done to determine the aging mechanism of mica-epoxy composite material used for large generator stator windings in order to estimate remaining life of the generator for last decades. After degrading artificially the mica-epoxy composite material, the surface analysis is performed to analyze breakdown mechanism of insulation in air and hydrogen atmosphere; i) In the case of air atmosphere, it is observed that an aging propagation from conductor to core by partial discharge effect and the formation of cracks between layers is widely carbonized surface. ii) In case of hydrogen atmosphere, the partial discharge effect is reduced by the hydrogen pressure (4kg/$\textrm{cm}^2$). Potassium ions forming a sheet of mica is replaced by hydrogen ions, which can lead to microcracks. It is confirmed that the sizes of crack by SEM analysis are 10∼20[$\mu\textrm{m}$] in length under air, and 1∼5[$\mu\textrm{m}$] in diameter, 10∼50[$\mu\textrm{m}$] in length under hydrogen atmosphere respectively. The breakdown mechanism of sttor winding insulation materials which are composed of mica-epoxy is analyzed by the component of materials with EDS, SEM techniques. We concluded that the postassium ions of mica components are replaced by H\ulcorner, H$_3$O\ulcorner at boundary area of mica-epoxy and/or mica-mica. It is proposed that through these phenomena, the conductive layers of potassium enable creation of voids and cracks due to thermal, mechanical, electrical and environmental stresses.

  • PDF

IPMSM 센서리스 제어의 안정된 기동을 위한 간단한 초기회전자 추정기법 (Simple Initial Rotor Position Estimation for Stable Startup of IPMSM Sensorless Control)

  • 김건명;박병건;구본관;김래영;현동석
    • 전력전자학회논문지
    • /
    • 제16권6호
    • /
    • pp.602-609
    • /
    • 2011
  • 본 논문은 역기전력 기반 센서리스 제어 시 안정적인 기동성능 확보를 위한 간단한 초기 회전자 위치추정 방법을 제안하였다. 제안된 방법은 전동기의 고정자 권선 인덕턴스의 차이에 의한 전류응답특성을 이용하여 초기 회전자 위치를 추정한다. 이러한 초기 회전자 위치추정 방법은 알고리즘 구현이 간단하고 추가적인 외부회로가 불필요하며, 전동기 상수의 영향을 받지 않는다. 제안된 방법의 타당성은 실험결과를 통하여 검증하였다.

30kVA 초전도전기 개발(II) ; 설계 및 성능평가 (30kVA Superconducting Generator Development : Design and Performance Test)

  • 백승규;손명환;권영길;고락길;이언용;류강식;박도영;김용주;안종보;김국헌
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1999년도 하계학술대회 논문집 A
    • /
    • pp.232-234
    • /
    • 1999
  • A 30kVA superconducting generator (S.G.) has been designed, developed and successfully tested in KERI before the end of last year. The design is based on 2-dimensional electromagnetic field analysis of cylindrical coordinate. The field winding of rotor has been wound with superconducting wire of Nb-Ti alloy and tested after assembled with other rotor components. The stator has air-gap type armature windings which allow higher terminal voltage and more sinusoidal voltage waveform than conventional iron cored machines. Steady-state open & short-circuit test and lamp load test have been conducted also. The results of tests are given in this paper and compared with design quantities. Moreover the cooling scheme and characteristics of test system is included.

  • PDF

100마력 고온초전도 모터 제작과 평가(I) (Fabrication and test of 100 hp High Tc Superconducting Motor)

  • 손명환;백승규;이언용;권영길;권운식;문태선;박희주;김영춘;조창호
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2004년도 하계학술대회 논문집 B
    • /
    • pp.1118-1120
    • /
    • 2004
  • For the first time in Korea, a 100hp high Tc superconducting(HTS) motor has been designed, developed and successfully tested recently. The design was based on 2-dimensional electromagnetic field analysis of cylindrical coordinate. The field winding of rotor was wound with Bi-2223 tapes and tested after assembled with other rotor components. The stator had air-gap type armature windings which allow higher terminal voltage and more sinusoidal voltage waveform than conventional iron cored machines. Steady state open & short-circuit test and resistive load test were conducted also in generator mode. The fabrication and test results of this machine were discussed in this paper.

  • PDF