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RISS 인기검색어
- 검색키워드
- 저자 : Duong Minh Trung (검색결과 1 건)
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Duong Minh Trung University of Science and Technology 2019 국내박사
Owing to the shortage of fossil fuel and a significant increase in the number of electric vehicles, it is mandatory to find alternative energy supplies to extend the mileage or operating time. Recovery of the wasted energy has been tremendously investigated for different sources, such as regenerative braking energy, thermal energy, and vibration energy from the suspension system. According to recent reports, harvestable power from the suspension system in a typical passenger car is between 100 and 400 W. This leads to a fuel efficiency improvement in the hybrid and electric vehicles by 7-10%. The major drawback of this technology lies in the difficulty of enhancing output power for a given space. The objective of this dissertation is the development of a high performance electromagnetic shock absorber applied to the vehicle energy harvesting technology. Operating conditions are based on the assumption that when a passenger car is moving on a road class C at a speed of 96 km/h, vibration speed, vibration frequency, and peak-to-peak stroke length on the shock absorber are 0.25 m/s, 10 Hz and 11.25 mm, respectively. Design targets for maximum and average output power are 250 and 100 W, maximum and average power density are 0.250 and 0.100 W/cm3, respectively. In this dissertation, direct-drive using a linear tubular generator is selected due to its simple structure, elimination of the transmission mechanisms, fast responses, etc. Different from most of the conventional devices, the novel machine combines both mechanical damper and electrical generator. Because of this specific configuration, the electromagnetic force has to be minimized to ensure safety and driving comfort. Based on the actual size of a commercial shock absorber in an SUV-Korando car, available space, and dimensions of the proposed machine are decided. To achieve the design targets, various topologiess including coreless model, cored model, inner and outer permanent magnet model, slot-pole combination, and number of phases are investigated. On top of that, to significantly increase the power density, a hybrid-permanent magnet structure is innovated. To simultaneously maximize output power and minimize electromagnetic force, multi-objective optimization based response surface method is implemented. Magnetic design and analytical prediction of performance are performed using an extensive finite-element analysis. Prototypes of the coreless and cored model are fabricated to evaluate the performance and verify the validity of the analysis. Experimental results are well-matched with analysis and all the design targets are successfully achieved.
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