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Emergency braking for free piston energy converters

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5 Author(s)
West, M. ; Dept. of Electron. & Electr. Eng., Univ. of Sheffield ; Long, S. ; Jiabin Wang ; Bingham, C.
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Free piston energy converters are a potential technology for future hybrid vehicles, as well as stationary power generation applications. A candidate 2-stroke system comprises of two opposing combustion chambers with a common piston rod, and integrated with a tubular permanent magnet electrical machine for the conversion of mechanical to electrical energy. A key issue for the ultimate adoption of such systems, however, is their robustness in the event of a fault to enable a safe shutdown, with minimal mechanical or electrical damage. The paper considers system braking issues and the importance of early fault detection. Results are presented to demonstrate the effectiveness of passive and active braking techniques for a range of dc-link supply voltage and operating output powers

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Power Electronics and Applications, 2005 European Conference on

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