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T. Kosaka,C. Higashihama,T. Ishihara,H. Matsumori,N. Matsui 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
This paper presents design study on a lightweight quasi-coreless surface permanent magnet synchronous motor (SPMSM) employing Carbon Fiber Reinforced Plastics (CFRP) as the stator body to make it lighter. Stator body is composed of CFRP, a little soft magnetic composites core and aluminum winding for high power density. The design procedure for lightening the quasi-coreless SPMSM and experimental drive performance evaluation results are reported. Finally, remaining issues which have been founded are discussed.
Experimental Studies on Drive Performances of Less Rare-Earth PM Hybrid Excitation Motor
T. Kosaka,T. Hirose,N. Matsui 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents feasibility studies on hybrid excitation motor (HEM) as a candidate of less rare-earth permanent magnet and high power density machine for hybrid electric vehicle drives. The construction, the basic working principle focusing on variable field control capability and the design concept of HEM are overviewed. After making the design restrictions and specifications clear, the drive performances of HEM designed are evaluated based on 3D-FEA. As a result, the proposed motor makes possible to reduce the volume of rare permanent magnet by approximately half of that used in existing interior permanent magnet synchronous motor for LEXUS RX400h while keeping the power density intact. With comparisons between the measured and the computed drive performances of the trial manufacturing of the downsized motor, it is verified that HEM becomes an attractive candidate as a less-rare-earth permanent magnet and high power density motor for HEV drives.
Two-Dimensional Imaging of Early Stage of Soot Formation in Diesel Spray Flame by LIF technique
Hidenori Kosaka,Tetsuya Aizawa,Yukio Matsui 한국자동차공학회 2001 한국자동차공학회 Symposium Vol.- No.-
To investigate the structure of reaction zone and the early process of young soot formation in a diesel spray flame, CH radical and polycyclic aromatic hydrocarbons formed in a flame were visualized two-dimensionally and simultaneously, CH radical was used as the indicator of reaction zone in a flame because CH is produced and destroyed in fuel decomposition zone and exists in thin layer near the stoichiometric contour in a flame, For the visualization of early soot formation zone in a flame, the polycyclic aromatic hydrocarbons (PAH) were used as tracers in LIF technique, PHA are well known as the precursors of young soot.<br/> A Nd:Y AG pumped dye laser was used as a light source. The wavelength of incident light was tuned to 390.58 nm to excite CH with the 01(8.5) transition of B²Σ-X²Ⅱ v '=0, v "=0) band. The sheet of light passed through the mid-plane of the flame and the LIF from the species in a flame were imaged by an ICCD camera. A narrow band optical filter with a central wavelength of 430 nm and a FWHM of 10 nm was used to detect the fluorescence from CH with the transition of A²Σ -X²Ⅱ (v '=0, v "=0) band. The LIF spectrum of PAH formed in a flame was detected by a spectrometer at excitation wavelengths of 266 nm, 355 nm and 390 nm. These spectrum were analyzed for identification of P AH formed in a flame.<br/> In preliminary experiments, CH and PAH formed in a diffusion burner flame were visualized two-dimensionally. Methane and propane were used as fuel. In the LIF images of gas jet diffusion flames, LIF of CH can be observed as the very thin layers with the width of less than 1 mm located in the flame periphery. In the central region surrounded by CH thin layer, the strong LIF from PAH can be seen. The LIF from central region of the jet has broad spectrum whose peak is at 440 nm.<br/>
Two-Dimensional Imaging of Ignition Processes in a Transient Fuel Spray
Hidenori, Kosaka,Takeyuki, Kamimoto 경상대학교 공과대학 항공기계공학부 1999 WORKSHOP 자료집 Vol.1999 No.1
To investigate the ignition processes in a diesel spray, the to-dimensional techniques of silicone oil particle scattering imaging (SSI) and laser induced fluorescence (LIF) were used. The sequential and two-dimensional images of SSI reveal that the first ignition occurs in the periphery of spray head vortices, not in spray tip. The fluorescent images of intermediate products which arc formed during the ignition reaction were taken by the LIF method with the laser sheet of the of the 3rd harmonics of ND:YAG laser. We conducted these visualization techniques and measured the chamber pressure under the same conditions. Then the ignition delay obtained by each technique was compared. This comparison showed that both the time when the first local heat release is. detected by SSI method and the time when the first fluorescence is by LIF method are nearly equal to the time when the total heat release due to ignition reaction exceeds the heat absorption of fuel evaporated.