Investigating the air flow rate of self-ventilated traction motors by means of Computational Fluid Dynamics

Streibl, B.; Neudorfer, Harald

doi:10.1109/speedam.2010.5542108

Cited by 8 publications

(5 citation statements)

References 2 publications

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“…This has been shown to increase the continuous power rating of a YASA motor by 43 %, according to the manufacturer's claims [18]. However, research into this cooling method [19] and the design of the fan [20] has not considered external airflows which might be encountered in a in-wheel situation, likely because this would be very difficult to generalise. Furthermore, the additional weight and axial space required by a cooling fan would be particularly disadvantageous for an in-wheel motor.…”

Section: Coolingmentioning

confidence: 99%

An Air-Cooled YASA Motor for in-Wheel Electric Vehicle Applications

Winterborne

Stannard

Sjöberg

et al. 2020

IEEE Trans. on Ind. Applicat.

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In-wheel motors present a range of opportunities for innovation in electric vehicle design as the torque produced at each of two or four wheels can be controlled individually. A high aspect ratio (large radius, short axial length) motor is required to fit within the wheel. Due to its location, liquid cooling of the inwheel motor is difficult and undesirable, but a high power density is required to reduce the mass-which is particularly important as it is unsprung-and fit the space envelope. Furthermore, a high torque density is required to eliminate the need for a gearbox. These constraints create a real challenge for the design of a machine for this application. An axial field machine using a Yokeless and Segmented Armature (YASA) topology is designed to fit these requirements as such a machine has clear advantages when considering the high aspect ratio. A soft magnetic composite (SMC) material is utilised to carry the flux in its non-planar path without incurring excessive losses or requiring a lamination design which is difficult and expensive to manufacture. A novel cooling arrangement involving heat-spreading elements on each armature segment is employed to improve heat dissipation and hence power density. The design, analysis, manufacturing, and testing of the motor is described in this paper to verify the concept against the requirements outlined above.

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Section: Coolingmentioning

confidence: 99%

An Air-Cooled YASA Motor for in-Wheel Electric Vehicle Applications

Winterborne

Stannard

Sjöberg

et al. 2020

IEEE Trans. on Ind. Applicat.

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“…Research Article [12][13][14]. However, except Jungreuthmayer et al [12], these were mostly about optimising the air flow through the cooling passages for enhanced thermal performance.…”

Section: Iet Electric Power Applicationsmentioning

confidence: 99%

“…CFD analysis is typically the most suitable for thermal modelling and heat transfer enhancement studies as it has the capability to successfully model the conjugate heat transfer phenomenon. There have been a few studies in the recent past which utilised CFD analysis for thermal modelling and design of TEFC type machines [12–14]. However, except Jungreuthmayer et al [12], these were mostly about optimising the air flow through the cooling passages for enhanced thermal performance.…”

Section: Introductionmentioning

confidence: 99%

Iterative conjugate heat transfer analysis for heat transfer enhancement of an externally cooled three‐phase induction motor

Tiwari¹,

Yavuzkurt

2017

IET Electric Power Applications

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A novel iterative conjugate heat transfer method is proposed for thermal modelling of a drill pump motor which is a constant speed three-phase induction motor. The major advantage of this technique is that it enables computational fluid dynamics (CFD) and heat transfer analysis of the rotor and the stator in a segregated manner. The two are then coupled in a separate annulus model, which represents the air gap, via boundary conditions on the annulus walls. This greatly reduces the total number of computational cells and enables good quality mesh generationa prerequisite for accurate CFD predictions. To validate this method, a baseline CFD and heat transfer analysis was done using FLUENT and the maximum temperature prediction was found to be within 1.75% of the previously done experiments on the existing design of the machine. Further, this method was applied to develop a heat transfer enhancement solution which reduced the maximum temperature in the drill motor from 203.5°C to 172.9°C.

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“…Regarding open self-ventilated (OSV) machines, research found in the literature usually deals with the hydraulic system [4][5][6]o r the calculations of the heat transfer coefficients of a specific element [7,8] using computational fluid dynamics software. These kinds of calculations require usually a deep knowledge of the physical phenomena and a long preparation time, and they are also very time consuming.…”

Section: Introductionmentioning

confidence: 99%

Coupled thermal and hydraulic algebraic models for an open self‐ventilated induction machine

Malumbres

Satrústegui²,

Elósegui

et al. 2015

IET Electric Power Applications

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The prediction of the thermal behaviour of electric motors in the early stages of their design is a critical factor for reducing time and cost in the design process. In complex machine topologies such as open self-ventilated machines, there are several phenomenas to take into accou n ti no r d e rt op r e d i c tt h ec o r r e c tt h e r m a lb e h a v i o u ro ft h em a c h i n e .I nt h i s study, a thermal model coupled with a hydraulic model is presented. These models provide information of the thermal behaviour of the machine. First, the complete thermal circuit is described, with some emphasis in the specially modelled parts. Then, the heat transfer coefficients for each surface inside the machine are presented, by the use of dimensionless correlations that avoids the need of previous knowledge. Moreover, the hydraulic model of the machine is studied, and also the coupling methodology between the two models is described for both steady state and transient calculations. Finally, the results from the model are validated using the data from two experimental runs, the first one with constant torque and speed, and the other with variable power, in a standardised service cycle, with a difference in the rotor bars and the stator winding below ±10°C.

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Investigating the air flow rate of self-ventilated traction motors by means of Computational Fluid Dynamics

Cited by 8 publications

References 2 publications

An Air-Cooled YASA Motor for in-Wheel Electric Vehicle Applications

An Air-Cooled YASA Motor for in-Wheel Electric Vehicle Applications

Iterative conjugate heat transfer analysis for heat transfer enhancement of an externally cooled three‐phase induction motor

Coupled thermal and hydraulic algebraic models for an open self‐ventilated induction machine

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