Electric motor internal fan system CFD validation

Cezario, C.A.; Oliveira, Amir Antônio Martins

doi:10.1109/icelmach.2008.4799904

Cited by 5 publications

(5 citation statements)

References 7 publications

(2 reference statements)

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“…Internal air circulation (in the motor's interior) is provided by blades installed directly on the rotor. At the same time, the rotor's blades or shaft impeller are common for closed electric motors [57,79]. This cools, in particular, the stator winding heads, the rotor winding, and the drive-end bearings.…”

Section: Airmentioning

confidence: 99%

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Recent Developments in Cooling Systems and Cooling Management for Electric Motors

Konovalov,

Tolstorebrov,

Eikevik

et al. 2023

Energies

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This study provides an overview of new trends in the development of cooling systems for electric motors. It includes a summary of academic research and patents for cooling systems implemented by leading motor manufacturers at TRL9. New trends in the cooling management of air and liquid cooling systems are discussed and analyzed with a focus on temperature distribution and its influence on the power-to-dimension ratio of electric motors. The prevailing cooling method for synchronous and asynchronous motors is air cooling using external fins, air circulation ducts, air gaps, and fan impellers to enhance efficiency and reliability. Internal cooling with rotor and stator ducts, along with optimized air duct geometry, shows potential to increase the power-to-dimension ratio and reduce motor size. Liquid cooling systems offer a power-to-dimension ratio of up to 25 kW/kg, achieved through redesigned cooling ducts, stator heat exchangers, and cooling tubes. However, liquid cooling systems are complex, requiring maintenance and high ingress protection ratings. They are advantageous for providing high power-to-dimension ratios in vehicles and aircraft. Discussions on using different refrigerants to improve efficient motor cooling are underway, with ozone-friendly natural refrigerants like CO2 considered to be promising alternatives to low-pressure refrigerants with high global warming potential.

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Section: Airmentioning

confidence: 99%

“…[7,8,10,[13][14][15][16][17][18]37,38,57,79] [50,51,55-62] Cooling channels in the rotor [42,64-75,79] [10,11,107,108,130] Contact cooling by injection Oil [117-124,127,131] Refrigerant [117,128,132] Energies 2023, 16, 7006 9 of 31…”

mentioning

confidence: 99%

Recent Developments in Cooling Systems and Cooling Management for Electric Motors

Konovalov,

Tolstorebrov,

Eikevik

et al. 2023

Energies

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“…Trigeol et al [15] deal with the combined numerical approach of thermal network and CFD analyses for an induction machine. Many researchers have done similar research and investigated thermal performance both numerically and experimentally [16][17][18][19][20][21][22]. In such complex problems, CFD can supplement the information about the flow and thermal fields by enabling the investigation of free-flow structures like vortices in the end winding section, hub, and recirculation zone.…”

Section: Introductionmentioning

confidence: 99%

Thermal Sensitivity Analysis of a liquid-cooled stator in a PM motor using CFD

Baile

2023

Preprint

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Electric Vehicles (EVs) are the solution to the current problem of climatic change due to environmental pollution, thereby conserving the environment. The need for faster adoption of EVs has gained massive importance in the field of e-mobility, and intense research is going on to launch it on a large scale of applications. The thermal management of the motor in an EV is an essential aspect because the electrical insulation has a temperature limit, affecting its efficiency. As part of the motor development, Flow and Conjugate Heat Transfer (CHT) analysis of the liquid-cooled stator has been carried out using Computational Fluid Dynamics (CFD). CFD bestows the advantage of visualizing the flows and temperature distributions in 3D. This paper deals with the thermal sensitivity analysis of the coolant flow path to study the various parameters affecting the flow in the stator. CHT studies are done by modelling all the fluid and solid domains. The effect of the mass flow rate of coolant, coolant inlet temperature, type of coolant, and heat loss on thermal parameters such as heat transfer coefficient (HTC), coolant temperatures, winding temperatures, and stator temperatures are discussed. The predicted flow and temperature results have been validated with the experimental test data, and the CFD results were within 3% of the experimental data.

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Section: Introductionmentioning

confidence: 99%

“…And in [18]- [20] internal and external shaft mounted fans are simulated and validated. In [18] a wooden end-winding has been built to test an identical machine to the simulated one in CFD, by this way interior air flows are measured and validated. With the next work [19] a simplified external case with fins has been built with the same objective, to validate experimentally the simulated model in CFD.…”

Section: Introductionmentioning

confidence: 99%

Radial fan simulations by computational fluid dynamics and experimental validation

SanAndres

Almandoz

Poza

et al. 2014

2014 International Conference on Electrical Machines (ICEM)

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Fans are commonly used to refrigerate electrical machines when air forced cooling is required. They are rather simple solutions that can considerably improve the thermal performance of electrical machines, so the fan analysis could become an important point during the thermal design of electrical machines. This paper presents an analysis by computational fluid dynamics (CFD) simulations with the goal of characterizing radial fans, used in electrical machines. Different boundary conditions and parameters that affect to CFD results are evaluated in order to get an efficient way to simulate radial fans. The main objective is to obtain the flowpressure characteristic curve of fans and airflow velocities by CFD simulations. Finally CFD simulation results of 2 fans are experimentally validated. One of them has been analysed in a fan testing wind tunnel. And the second one has been analysed in an auto-ventilated machine.Index Terms-computational fluid dynamics (CFD), cooling systems design, fan characterization, thermal optimization, electrical machines, lumped-parameters thermal models, airflow pressure, fan testing wind tunnel, auto-ventilated machine. he is currently an Associate Professor. His current research interests include electrical machine design, modeling, and control. He has participated in various research projects in the fields of wind energy systems, lift drives, and railway traction. he is currently an Associate Professor. His current research interests include electrical machine design, modeling, and control. He has participated in various research projects in the fields of wind energy systems, lift drives, and railway traction. Gaizka Ugalde received the B.Eng. and Ph.D. degrees in electrical engineering from the University of Mondragón, Mondragón, Spain, in 2006 and 2009, respectively. Since 2009, he has been with the Department of Electronics, Faculty of Engineering, University of Mondragón, where he is currently an Associate Professor. His current research interests include permanent-magnet-machine design, modeling, and control. He has participated in various research projects in the fields of lift drives and railway traction.

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Electric motor internal fan system CFD validation

Cited by 5 publications

References 7 publications

Recent Developments in Cooling Systems and Cooling Management for Electric Motors

Recent Developments in Cooling Systems and Cooling Management for Electric Motors

Thermal Sensitivity Analysis of a liquid-cooled stator in a PM motor using CFD

Radial fan simulations by computational fluid dynamics and experimental validation

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