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- Title
Non‐invasive KERS‐based auxiliary energy supply system for freight trains.
- Authors
Flankl, Michael; Tüysüz, Arda; Subotic, Ivan; Kolar, Johann Walter; Tsukada, Yusuke; Nakamura, Kazuhito
- Abstract
Freight wagons typically do not have an electrical train supply and state‐of‐the‐art auxiliary energy generation systems as, e.g. axle generators on freight wagons lack the possibility for a cost‐effective retrofit. However, emerging applications, as, e.g. anti‐lock braking systems for freight trains or condition monitoring systems for the loaded goods, require electric power in the watt range. Therefore, a non‐invasive auxiliary energy supply system with 22 W/dm3 (360 mW/in3) based on a non‐coaxial eddy‐current coupling is described and analysed in this study. It is a kinetic energy recovery system, which can extract power directly from the motion of a freight wagon's wheel. An air gap of 10 mm between the wheel and a permanent magnet rotor is set during operation, making the system a non‐invasive one. A model for the transfer efficiency of the system is established and verified by measurements. The prototype including an optimised generator and an integrated active rectifier for generating a DC‐output voltage is built and an electric power of 8 W can be extracted from a steel wheel moving with a surface speed of 22 m/s.
- Publication
IET Electrical Systems in Transportation (Wiley-Blackwell), 2019, Vol 9, Issue 2, p93
- ISSN
2042-9738
- Publication type
Article
- DOI
10.1049/iet-est.2018.5014