Browsing by Author "Tsai, Mi-Ching"

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Characteristic Comparison of Transversally Laminated Anisotropic Synchronous Reluctance Motor Fabrication Based on 2D Lamination and 3D Printing
(2015-01-01)
Zhang, Zhi-Yong
;
Tsai, Mi-Ching
;
Huang, Po-Wei
;
Cheng, Chung-Wei
;
Huang, Jian-Mi
Synchronous reluctance motors (SynRM) have been widely used because of their excellent performance, such as high efficiency and accurate speed control. This paper focused on the efficiency and starting ability of SynRM. Based on the view of steel sheet material and motor fabrication, the iron loss influences on SynRM regarding different grades of silicon steel are compared, and the performance of a squirrel cage assisted SynRM is investigated. Moreover, a new fabrication involving additive manufacturing (namely 3D printing) and a new high conductivity magnetic powder for facilitating the new SynRM fabrication process are proposed.
Characteristic Comparison of Transversally Laminated Anisotropic Synchronous Reluctance Motor Fabrication Based on 2D Lamination and 3D Printing
(2015)
Zhang, Zhi-Yong
;
Tsai, Mi-Ching
;
Huang, Po-Wei
;
Cheng, Chung-Wei
;
Huang, Jian-Mi
Synchronous reluctance motors (SynRM) have been widely used because of their excellent performance, such as high efficiency and accurate speed control. This paper focused on the efficiency and starting ability of SynRM. Based on the view of steel sheet material and motor fabrication, the iron loss influences on SynRM regarding different grades of silicon steel are compared, and the performance of a squirrel cage assisted SynRM is investigated. Moreover, a new fabrication involving additive manufacturing (namely 3D printing) and a new high conductivity magnetic powder for facilitating the new SynRM fabrication process are proposed.
Single Track of Selective Laser Melting Process: Modeling and Experimental Comparison
(2019-09-01)
Cheng, Chung-Wei
;
Liou, Yao-Wen
;
Lee, An-Chen
;
Tsai, Mi-Ching
;
機械工程學系
This study uses finite element software to simulate the single melted track of powder (Maraging Steel) on a substrate (S45C). The simulation model considers the absorption penetrating depth of laser power on the powder bed and the penetrating energy irradiating the substrate. A volumetric heat source is applied to the powder bed model, and a surface heat source is applied to the substrate model to obtain the simulated temperature field distribution. The interface melt width between the powder bed, substrate surface, and the substrate melt depth are estimated according to the temperature field distribution. In the experiments, a self-developed SLM experimental system is used, and the laser power and scanning speed are adjusted to observe the effect of a single continuous track on the S45C substrate, which is compared with a theoretical simulation.
Synchronized multi-spot scanning strategies for the laser powder bed fusion process
(2019-05-01)
Tsai, Chun-Yu
;
Cheng, Chung-Wei
;
Lee, An-Chen
;
Tsai, Mi-Ching
;
機械工程學系
The laser powder bed fusion (LPBF) process can produce parts with complex internal geometries that cannot be easily manufactured using a material removal process. However, owing to the different heat transfer efficiencies of a laser melting process, the optimal process parameters are limited to a small range. This study used galvanometric scanner technology and a diffractive optical element (DOE) to build an experimental multi-spot LPBF system. Adjustable characteristics were the angle and the lateral distance between spots. An adjustable multispot method was used to modulate the temperature field on the powder bed and enhance the processing quality and throughput. The results from the synchronized three-spot method using different scanning strategies improved the layer surface roughness Ra by 3.2 mu m. Moreover, the scanning time was decreased by 38.1% of the single-spot method.