The Experts below are selected from a list of 36417 Experts worldwide ranked by ideXlab platform
H.c. Wong - One of the best experts on this subject based on the ideXlab platform.
-
Analytical prediction of armature-reaction field in disc-Type permanent magnet Generators
IEEE Transactions on Energy Conversion, 1999Co-Authors: Y.j. Zhang, Guodong Xie, H.c. WongAbstract:A two dimensional (2D) analytical method to predict the armature-reaction field in the slotted opening airgap/magnet region of a permanent magnet (PM) disc-Type Generator is presented. The currents in the slot are modeled by a uniform distributed current sheet along an arc at the slot opening. The analysis takes into account the harmonics in the armature current waveforms which are calculated from the voltage equations. The effects of the stator slot openings are being accounted for by the introduction of a 2D relative permeance function which is calculated directly from the nonlinear equation described by conformal transformation. A more refined permeance distribution can then be obtained easily.
Y.j. Zhang - One of the best experts on this subject based on the ideXlab platform.
-
Analytical prediction of armature-reaction field in disc-Type permanent magnet Generators
IEEE Transactions on Energy Conversion, 1999Co-Authors: Y.j. Zhang, Guodong Xie, H.c. WongAbstract:A two dimensional (2D) analytical method to predict the armature-reaction field in the slotted opening airgap/magnet region of a permanent magnet (PM) disc-Type Generator is presented. The currents in the slot are modeled by a uniform distributed current sheet along an arc at the slot opening. The analysis takes into account the harmonics in the armature current waveforms which are calculated from the voltage equations. The effects of the stator slot openings are being accounted for by the introduction of a 2D relative permeance function which is calculated directly from the nonlinear equation described by conformal transformation. A more refined permeance distribution can then be obtained easily.
Guodong Xie - One of the best experts on this subject based on the ideXlab platform.
-
Analytical prediction of armature-reaction field in disc-Type permanent magnet Generators
IEEE Transactions on Energy Conversion, 1999Co-Authors: Y.j. Zhang, Guodong Xie, H.c. WongAbstract:A two dimensional (2D) analytical method to predict the armature-reaction field in the slotted opening airgap/magnet region of a permanent magnet (PM) disc-Type Generator is presented. The currents in the slot are modeled by a uniform distributed current sheet along an arc at the slot opening. The analysis takes into account the harmonics in the armature current waveforms which are calculated from the voltage equations. The effects of the stator slot openings are being accounted for by the introduction of a 2D relative permeance function which is calculated directly from the nonlinear equation described by conformal transformation. A more refined permeance distribution can then be obtained easily.
Siniauskas Linas - One of the best experts on this subject based on the ideXlab platform.
-
Performance study of triple-wing rotor 10kW vertical axis wind turbine
2020Co-Authors: Siniauskas LinasAbstract:Siekiant energetinės šalių nepriklausomybės, Europoje didėja mažųjų vėjo jėgainių kiekis, MVE energetika tampa patraukli naudoti namų ūkiuose. Tiriant ir modifikuojant mažos galios vėjo jėgainių vėjaračius, naudojant pastovių magnetų Generatorius, didėja MVE veikimo efektyvumas ir pagamintos energijos kiekis esant įvairiam vėjo greičiui. Darbo tikslas – nustatyti inovatyvaus plyšinio sparno vertikalios ašies vėjo jėgainės techninį ekonominį efektyvumą bei surasti naudingumo koeficiento ir greitaeigiškumo rodiklius. Šiame darbe ištirta inovatyvaus LAK-VAVE trigubo plyšinio sparno ir aksialinio tipo generato¬riaus 10 kW galios mažoji vertikalios ašies vėjo jėgainė. Mažosios VE tyrimas atliktas lauko, mažo paviršiaus šiurkštumo sąlygomis, 6 m aukštyje. MVE sumontuota Kauno rajone, Pociūnuose. Vertikalios ašies vėjo jėgainės tyrimų duomenys ir elektros energijos parametrai matuoti eksperimentiniu išmaniuoju valdikliu su pastovia apkrova. Eksperimentiniai matavimai buvo atliekami trimis kelių dienų intervalais, skirtingais metų laikais 2015-2018 metais. Tyrime buvo analizuojami MVE matavimų duomenys, skaičiuojama vėjo ir MVE galia, efektyvumas bei rastas naudingumo koeficientas ir greitaeigiškumo rodiklis. Eksperimento metu fiksuota didžiausia MVE galia – 2501 W, pasiektas vidutinis efektyvumo koeficientas – 0,55, vėjo greičių intervale nuo 8 iki 10 m/s, kai greitaeigiškumo rodiklis siekia 0,9. Techninio-ekonominio efekty-vu¬mo kriterijus, pučiant 6 m/s greičio vėjui yra 23,5 W2/Eur·m2.In order to achieve countrywide energy independence, small-scale wind energy is rapidly developing around European lands and is becoming more and more attractive for household use. By researching and improving low-power wind turbines (LPWT) and Generators, their operating efficiency and the amount of energy produced at various wind speeds are increasing. The aim of the work is to determine the Technical economic efficiency of an innovative slit wing Vertical Axis Wind Turbine and to find the indicators that define the coefficient of efficiency and speed. In this work, the small vertical wind axis wind turbine of 10 kW power of the innovative LAK-VAVE triple slit wing and axial Type Generator was investigated. The SWT study was performed in field conditions with low surface roughness at a height of 6 m. The wind turbine is installed in Kaunas district, Pociūnai. Wind farm research data and power parameters were measured with an experimental smart controller with a constant load. Experimental measurements were performed at three several-day intervals, at different times of the year that took place in years 2015-2018. The study analyzed VAWT measurement data, calculated SWT power, found the coefficient of efficiency with the Tip speed ratio (TSR). During the experiment, the maximum VAWT power was fixated at 2501 W and the average efficiency coefficient of 0.55 was achieved, in the range of wind speeds from 8 to 10 m/s, when the TSR reached 0.9. The criterion of technical and economic efficiency in wind speeds of 6 m/s is 23.5 W2/EUR·m2.Energetikos ir biotechnologijų inžinerijos instituta
-
Performance study of triple-wing rotor 10kW vertical axis wind turbine
2020Co-Authors: Siniauskas LinasAbstract:Siekiant energetinės šalių nepriklausomybės, Europoje didėja mažųjų vėjo jėgainių kiekis, MVE energetika tampa patraukli naudoti namų ūkiuose. Tiriant ir modifikuojant mažos galios vėjo jėgainių vėjaračius, naudojant pastovių magnetų Generatorius, didėja MVE veikimo efektyvumas ir pagamintos energijos kiekis esant įvairiam vėjo greičiui. Darbo tikslas – nustatyti inovatyvaus plyšinio sparno vertikalios ašies vėjo jėgainės techninį ekonominį efektyvumą bei surasti naudingumo koeficiento ir greitaeigiškumo rodiklius. Šiame darbe ištirta inovatyvaus LAK-VAVE trigubo plyšinio sparno ir aksialinio tipo generato¬riaus 10 kW galios mažoji vertikalios ašies vėjo jėgainė. Mažosios VE tyrimas atliktas lauko, mažo paviršiaus šiurkštumo sąlygomis, 6 m aukštyje. MVE sumontuota Kauno rajone, Pociūnuose. Vertikalios ašies vėjo jėgainės tyrimų duomenys ir elektros energijos parametrai matuoti eksperimentiniu išmaniuoju valdikliu su pastovia apkrova. Eksperimentiniai matavimai buvo atliekami trimis kelių dienų intervalais, skirtingais metų laikais 2015-2018 metais. Tyrime buvo analizuojami MVE matavimų duomenys, skaičiuojama vėjo ir MVE galia, efektyvumas bei rastas naudingumo koeficientas ir greitaeigiškumo rodiklis. Eksperimento metu fiksuota didžiausia MVE galia – 2501 W, pasiektas vidutinis efektyvumo koeficientas – 0,55, vėjo greičių intervale nuo 8 iki 10 m/s, kai greitaeigiškumo rodiklis siekia 0,9. Techninio-ekonominio efekty-vu¬mo kriterijus, pučiant 6 m/s greičio vėjui yra 23,5 W2/Eur·m2.In order to achieve countrywide energy independence, small-scale wind energy is rapidly developing around European lands and is becoming more and more attractive for household use. By researching and improving low-power wind turbines (LPWT) and Generators, their operating efficiency and the amount of energy produced at various wind speeds are increasing. The aim of the work is to determine the Technical economic efficiency of an innovative slit wing Vertical Axis Wind Turbine and to find the indicators that define the coefficient of efficiency and speed. In this work, the small vertical wind axis wind turbine of 10 kW power of the innovative LAK-VAVE triple slit wing and axial Type Generator was investigated. The SWT study was performed in field conditions with low surface roughness at a height of 6 m. The wind turbine is installed in Kaunas district, Pociūnai. Wind farm research data and power parameters were measured with an experimental smart controller with a constant load. Experimental measurements were performed at three several-day intervals, at different times of the year that took place in years 2015-2018. The study analyzed VAWT measurement data, calculated SWT power, found the coefficient of efficiency with the Tip speed ratio (TSR). During the experiment, the maximum VAWT power was fixated at 2501 W and the average efficiency coefficient of 0.55 was achieved, in the range of wind speeds from 8 to 10 m/s, when the TSR reached 0.9. The criterion of technical and economic efficiency in wind speeds of 6 m/s is 23.5 W2/EUR·m2.Žemės ūkio inžinerijos fakultetasEnergetikos ir biotechnologijų inžinerijos instituta
Dominiek Reynaerts - One of the best experts on this subject based on the ideXlab platform.
-
material removal mechanism in low energy micro edm process
Cirp Annals-manufacturing Technology, 2015Co-Authors: Jun Qian, Fei Yang, Jun Wang, Bert Lauwers, Dominiek ReynaertsAbstract:Abstract Extensive experiments have been carried out to understand the fundamentals in micro-EDM and especially the material removal mechanism in the finishing regimes of micro-EDM with a RC Type Generator. Oscillation of the sparking current and voltage has been observed when a high open-voltage was applied and this phenomenon has been predicted by electrical simulations and further experimentally verified. Experiments show that the effect of negative current flow in the sparking gap is not a simple polarity switch. Contrary to the conventional understanding, the negative current flow in a single sparking cycle is also contributing to effective material removal on the workpiece.
