Thermal modelling of a fractional-slot concentrated-winding Kaman type Axial-Flux Permanent-Magnet machine

Vainel, Gy; Staton, D.A.; Capponi, Fabio Giulii; Donato, Giulio De; Caricchi, F.

doi:10.1109/ecce.2013.6646883

Cited by 13 publications

(12 citation statements)

References 16 publications

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“…The material thermal properties used in the analysis have been derived experimentally or obtained from manufactures data [12]. More detailed information regarding the modelling technique used in application to an axial-flux machine can be found in [38].…”

Section: B Lumped Parameters Thermal Modelmentioning

confidence: 99%

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Investigation of Mechanical Loss Components and Heat Transfer in an Axial-Flux PM Machine

Wróbel

Vainel

Copeland

et al. 2015

IEEE Trans. on Ind. Applicat.

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This paper investigates components of mechanical loss together with heat transfer effects in an axial-flux PM motor. The mechanical loss components generated within electrical machines are well known, however, their prediction or derivation has not been widely reported in the literature. These, together with the electromagnetic loss sources and heat transfer effects are crucial and must be accounted for when considering high-power-density, high-speed and/or compact machine designs. This research is focused on separating the mechanical loss components to gain a more in depth understanding of the effects and their importance. Both experimental and theoretical techniques have been employed in the analysis of a machine demonstrator. In particular, hardware tests with dummy rotors have been performed to measure the bearing and windage/drag loss components. These have been supplemented with CFD analysis to theoretically evaluate the aerodynamic effects occurring within the mechanical air-gap accounting for loss and heat transfer. It has been identified that the analysed hardware demonstrator suffered from bearing loss significantly higher than that suggested by the bearing manufacturer. This has been attributed to design of the mechanical assembly accommodating bearings, which resulted in inappropriate bearing preload. The excessive bearing loss had a significant detrimental effect on the machine thermal behaviour. In contrast, the aerodynamic effects have been found to have less pronounced effects here, due to fully enclosed and naturally cooled machine construction.Index Terms-Axial-flux PM machine, mechanical loss, heat transfer, computational fluid dynamics, thermal equivalent circuit, bearing loss, windage loss.

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Section: B Lumped Parameters Thermal Modelmentioning

confidence: 99%

“…In all cases, the mechanical loss had a pronounced, detrimental impact on the machines performance [36]- [38]. This has been later rectified by careful considerations of the mechanical design and assembly processes for the analysed machine designs.…”

Section: Introductionmentioning

confidence: 96%

Investigation of Mechanical Loss Components and Heat Transfer in an Axial-Flux PM Machine

Wróbel

Vainel

Copeland

et al. 2015

IEEE Trans. on Ind. Applicat.

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“…14(d) shows the final assembly of the prototype; the machine case is totally enclosed, and cooling fins are visible on the side surface, and heat is extracted by forced ventilation flowing in the axial direction. Further details on the cooling system of this machine can be found in [22].…”

Section: Experimental Testsmentioning

confidence: 99%

Fractional-Slot Concentrated-Winding Axial-Flux Permanent-Magnet Machine With Tooth-Wound Coils

Capponi

Donato

Caricchi

et al. 2014

IEEE Trans. on Ind. Applicat.

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This paper presents the design, finite element\ud analyses and experimental validation of a Kaman type,\ud fractional-slot concentrated-winding, axial-flux permanent\ud magnet machine with tooth-wound coils. In this particular\ud topology, the flux travels axially through the permanent magnets,\ud from one stator to the opposite, so that there is no need for any\ud rotor back-iron. Thus, the rotor is an assembly of permanent\ud magnets and a suitably designed holder. In order to guarantee\ud adequate mechanical stiffness, stainless steel has been selected as\ud the holder’s material. Different designs of this holder are\ud investigated, with the aim of minimising the induced losses\ud therein. Both no-load and on-load performances are analysed\ud with 2D time-stepped FE simulations, with particular attention\ud devoted to rotor losses. A full scale prototype is built, together\ud with two of the previously investigated holder structures.\ud Experimental tests confirm the validity of the design and of the\ud FE simulations

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“…The use of PORTUNUS in modelling an axial-flux permanent-magnet (AFPM) machine can be found in [3]. Due to the machine symmetry, only half of one-twelfth (30°) segment is modelled for the stator and half of one sixteenth (22.5°) segment is modelled for the rotor as shown in Fig.…”

Section: A Lumped Parameter Thermal Network Modelmentioning

confidence: 99%

Thermal design of a magnet-free axial-flux switch reluctance motor for automotive applications

Chong

Staton

Egaña

et al. 2016

2016 Eleventh International Conference on Ecological Vehicles and Renewable Energies (EVER)

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With the requirement to develop magnet-free motors for automotive application, more design effort is needed for thermal design as the machine temperature limits the motor performance. Thermal design procedure of automotive motor has to fully exploit the modern approaches in electrical machine thermal analysis in terms of accuracy and solving time. This paper proposes a computational-cost-effective way to obtain the optimum thermal design of an axial-flux switched reluctance motor by means of lumped circuit methods with some inputs from Computational Fluid Dynamic simulations.

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Thermal modelling of a fractional-slot concentrated-winding Kaman type Axial-Flux Permanent-Magnet machine

Cited by 13 publications

References 16 publications

Investigation of Mechanical Loss Components and Heat Transfer in an Axial-Flux PM Machine

Investigation of Mechanical Loss Components and Heat Transfer in an Axial-Flux PM Machine

Fractional-Slot Concentrated-Winding Axial-Flux Permanent-Magnet Machine With Tooth-Wound Coils

Thermal design of a magnet-free axial-flux switch reluctance motor for automotive applications

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