Weight optimization of a cooling system composed of fan and extruded fin heat sink

Gammeter, Christoph; Krismer, Florian; Kolar, Johann W.

doi:10.1109/ecce.2013.6646978

Cited by 15 publications

(21 citation statements)

References 15 publications

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“…At last, a heat transfer coefficient of h c,sta = 750 W/m 2 K for the stator surface and h c,ra = 250 W/m 2 K for the rotor surface is assumed, based on [3]. No axial heat transfer is considered.…”

Section: A Radial Flux Machinesmentioning

confidence: 99%

“…1 depicts the electrical system for the AWT proposed in [1]; four bi-directional dc-dc converters are linking eight generators with voltage source rectifiers to a tether and a bidirectional dc-ac converter connects the tether to the threephase grid on the ground. The converter topology for the dc-dc converter is detailed in [1]- [3]. The AWT uses the electrical machines in generator operation during cross wind flight and in motor operation for launching and landing sequences.…”

Section: Introductionmentioning

confidence: 99%

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Weight optimization of a machine for airborne wind turbines

Gammeter¹,

Drapela²,

Tüysüz³

et al. 2014

IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society

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This paper details the weight optimization of the electrical machine required for an Airborne Wind Turbine (AWT) system. Presented investigations include the analysis of the powerto-weight ratio versus efficiency limits, γ-η Pareto fronts, of radial and axial flux machine topologies, by making use of analytical models, describing the electromagnetic and thermal behaviour. A direct search method is employed rather than a cost function minimization algorithm, as the analytical models allow the evaluation of the whole design space in a computationally efficient manner. The results reveal that the best performance in this case is achieved with a radial flux machine with an internal rotor where the magnets are arranged in a Halbach configuration. Including the weight of electromagnetically inactive parts, such as bearings, shaft and housing, a power-to-weight ratio of γ ≈ 6.2 kW/kg (2.8 kW/lb), at an efficiency of η ≈ 96 %, and a rated speed of 3200 r/min is achieved.

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Section: A Radial Flux Machinesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Weight optimization of a machine for airborne wind turbines

Gammeter¹,

Drapela²,

Tüysüz³

et al. 2014

IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society

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“…Thereby, sufficient distance from the cooler surface has to be kept to obtain stationary values that allow reproducible results. According to [4]- [14], also an analytical model was conducted to predict the thermal resistance of the heat sink (theory not presented here). A comparison of practical and theoretical results shows that the thermal resistance can be predicted within an acceptable error of ±25%.…”

Section: Natural Convectionmentioning

confidence: 99%

A new generation of modular power inductors with minimum thermal resistance

Stadler¹,

Stolzke²,

Gulden³

2014

2014 16th European Conference on Power Electronics and Applications

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Improving power density is a permanent challenge of R&D in power electronics. A survey of modern power electronic circuits shows that further optimization has to be based on the passives and particularly on the inductive components. State of the art inductors (e.g. in LC/LCL filters) contribute a lot to space, weight, losses and cost as well. In this paper, a new generation of power inductors is presented. The thermal management of these components has been optimized using FEM and extensive thermal measurements. Thus, much higher electrical current densities have become possible at the same hot-spot temperature, which is finally equivalent to higher energy density and smaller component size.

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“…The tether, a fiber and cable combination, provides both, the required mechanical strength and the electrical link to the ground station [1]- [4], which is connected to the medium voltage (MV) grid. The greatest challenge with respect to the realization of the electric system of the considered AWT, with a total maximum input power of 100 kW, is to achieve a lightweight tether [1]- [4], lightweight generators [1], [5]- [10], and power converters [1], [11]- [27]. From related investigations detailed in [1] the electrical system depicted in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…2) Lightweight magnetic components: Multi physics modeling and design optimization of transformers and inductors in reference to geometric optimization, magnetic material properties, medium/high frequency operation and high voltage isolation stress analysis [18]- [24]. 3) Cooling systems: Optimizations that yield cooling systems which feature minimal weight for a required thermal resistance [25]- [27].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Conceptualization, Design, and Experimental Verification of a Weight-Optimized All-SiC 2 kV/700 V DAB for an Airborne Wind Turbine

Gammeter

Krismer

Kolar

2016

IEEE J. Emerg. Sel. Topics Power Electron.

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This paper details the design, the implementation, and the experimental verification of a minimum weight input series output parallel (ISOP) structured Dual Active Bridge (DAB) converter for an Airborne Wind Turbine (AWT) system. The main power components of the DAB converter, in particular the bridge circuits, the actively cooled high frequency (HF) transformer and inductor, and the cooling system, which largely contribute to the total system weight, are designed and realized based on multi-objective considerations, i.e. with respect to weight and efficiency. Furthermore, the design includes all necessary considerations to realize a fully functional prototype, i.e. it also considers the auxiliary supply, the control for stable operation of the system, which also comprises an input filter, over the specified operating range, and the startup and shut down procedure. These considerations show the complex interactions of the various system parts and reveal that a comprehensive conceptualization is necessary to arrive at a reliable minimum weight design. Experimental results validate the proposed design procedure for a realized lightweight DAB hardware prototype with a rated power of 6.25 kW. The prototype weighs 1.46 kg, i.e. features a power to weight ratio of 4.28 kW/kg (1.94 kW/lb), and achieves a maximum full-load efficiency of 97.5 %.

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Weight optimization of a cooling system composed of fan and extruded fin heat sink

Cited by 15 publications

References 15 publications

Weight optimization of a machine for airborne wind turbines

Weight optimization of a machine for airborne wind turbines

A new generation of modular power inductors with minimum thermal resistance

Comprehensive Conceptualization, Design, and Experimental Verification of a Weight-Optimized All-SiC 2 kV/700 V DAB for an Airborne Wind Turbine

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