On the Efficiency of a Two-Power-Level Flywheel-Based All-Electric Driveline

Johan Abrahamsson, Janaína Gonçalves De Oliveira, Juan De Santiago, Johan Lundin and Hans Bernhoff
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Johan Abrahamsson: Division for Electricity, Department of Engineering Sciences, Uppsala University, Uppsala 75105, Sweden
Janaína Gonçalves De Oliveira: Division for Electricity, Department of Engineering Sciences, Uppsala University, Uppsala 75105, Sweden
Juan De Santiago: Division for Electricity, Department of Engineering Sciences, Uppsala University, Uppsala 75105, Sweden
Johan Lundin: Division for Electricity, Department of Engineering Sciences, Uppsala University, Uppsala 75105, Sweden
Hans Bernhoff: Division for Electricity, Department of Engineering Sciences, Uppsala University, Uppsala 75105, Sweden

Energies, 2012, vol. 5, issue 8, 1-24

Abstract: This paper presents experimental results on an innovative electric driveline employing a kinetic energy storage device as energy buffer. A conceptual division of losses in the system was created, separating the complete system into three parts according to their function. This conceptualization of the system yielded a meaningful definition of the concept of efficiency. Additionally, a thorough theoretical framework for the prediction of losses associated with energy storage and transfer in the system was developed. A large number of spin-down tests at varying pressure levels were performed. A separation of the measured data into the different physical processes responsible for power loss was achieved from the corresponding dependence on rotational velocity. This comparison yielded an estimate of the perpendicular resistivity of the stranded copper conductor of 2.5 × 10 ?8 ± 3.5 × 10 ?9 . Further, power and energy were measured system-wide during operation, and an analysis of the losses was performed. The analytical solution was able to reproduce the measured distribution of losses in the system to an accuracy of 4.7% (95% CI). It was found that the losses attributed to the function of kinetic energy storage in the system amounted to between 45% and 65%, depending on usage.

Keywords: kinetic energy storage; flywheel; electric machine; driveline; electric vehicle; losses (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2012
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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