Analyzing of two types water cooling electric motors using computational fluid dynamics

Pechánek, Roman; Bouzek, Lukas

doi:10.1109/epepemc.2012.6397424

Cited by 37 publications

(11 citation statements)

References 6 publications

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“…For incompressible fluids, the density does not change with the pressure. The RANS equations can be described for fluid flow of an incompressible fluid by the following equations, see [22]:…”

Section: Thermal Analysismentioning

confidence: 99%

Optimization, 3D-Numerical Validations and Preliminary Experimental Tests of a Wound Rotor Synchronous Machine

et al. 2021

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In this paper, a complete methodology to design a modular brushless wound rotor synchronous machine is proposed. From a schedule of conditions and a chosen structure (with 7 phases, 7 slots and 6 poles), a non-linear and non-convex optimization problem is defined and solved using NOMAD (a derivative free local optimization code): the external volume is minimized under some constraints, which are the average torque equal to 5 Nm, the torque ripple less than 5%, the efficiency greater than 94%, and the surface temperature less than 85 °C. The constraints have to be computed using 2D-finite element simulations in order to reduce the CPU-time consumption for each NOMAD iteration. Moreover, a relaxation of this optimization problem makes it possible to provide an efficient starting point for NOMAD. Thus, a good optimal design is obtained, and it is then validated by using 3D electromagnetic and thermic numerical methods. These numerical verifications show that, inside the end-winding, the leakage flux is high. This yields a lot of iron losses in this machine. Moreover, the surface and coil temperature differences between the 2D and 3D numerical approaches are discussed. Finally, the machine prototype is built following the optimal dimensions and a POKI-POKITM assembly technology. Preliminary experimental tests are carried out, and the results are devoted to the comparison of measured and predicted 3D numerical results.

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Section: Thermal Analysismentioning

confidence: 99%

Optimization, 3D-Numerical Validations and Preliminary Experimental Tests of a Wound Rotor Synchronous Machine

et al. 2021

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“…(3) When determining the boundary conditions of the fluid inlet and outlet, it is assumed that the temperature difference between the inlet and outlet is 20 • C; the inlet temperature and ambient temperature are both set to 20 • C, and it is assumed that the total loss will be taken away by the cooling water, and the inlet flow can be calculated by the following formula [28]:…”

Section: Determination Of Materials Properties Of Iwmmentioning

confidence: 99%

Research on the Electromagnetic-Heat-Flow Coupled Modeling and Analysis for In-Wheel Motor

Xue

Tan

Liu

et al. 2020

WEVJ

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In this paper, a 15 KW in-wheel motor (IWM) is taken as the research object, and the coupling factors among the electromagnetic field, temperature field and flow field are analyzed, and the strong and weak coupling factors between the three fields are clarified, and by identifying the strong and weak coupling factors between the three fields, a three-field coupling analysis model for IWM with appropriate complexity is established, and the validity of the model is verified. In a certain driving condition, the electromagnetic field, temperature field and flow field characteristics of IWM are analyzed with the multi-field coupling model. The result shows that, after the IWM runs 8440 s under driving conditions, in this paper, the IWM electromagnetic torque of the rated working condition is 134.2 Nm, and IWM the electromagnetic torque of the peak working condition is 451.36 Nm, and the power requirement of the motor can be guaranteed. The highest temperature of the IWM is 150 °C, which does not exceed the insulation grade requirements of the motor (155 °C), the highest temperature of the permanent magnet (PM) is 65.6 °C, and it does not exceed the highest operating temperature of the PM, and ensures the accurate calculation of components loss and the temperature of the motor. It can be found, through research, that the electromagnetic torque difference between unidirectional coupling and bidirectional coupling is 3.2%, the maximum temperature difference is 7.98% in the three-field coupling analysis of IWM under rated working conditions. Therefore, it is necessary to consider the influence of coupling factors on the properties of motor materials when analyzing the electromagnetic field, temperature field and flow field of IWM; it also provides some reference value for the simulation analysis of IWM in the future.

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“…Due to the advancement of the computational power in the recent years, using CFD conjugate thermal analysis for electric machines became a focus of several researchers [107,108]. Previous research using conjugate CFD thermal analysis focused on air cooled systems [109][110][111], water or oil cooled systems [80,112,113] and hybrid systems [114]. In the recent study performed by Schrittwieser et al [111], the authors compared between the simulation results based on a conjugate heat transfer model and those obtained by conventional heat transfer model (no conduction).…”

Section: Cfd Analysismentioning

confidence: 99%

Thermal management of electric machines

Yang

Bilgin

Kasprzak

et al. 2017

IET Electrical Systems in Transportation

113

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Electric machines have broadly been used in many industries including the transportation industry. With the evolving trend of electrification in transportation, electric machines with higher power density and higher efficiency are demanded and, thus, more stringent thermal management requirements are needed for electrified vehicle applications. This study comprehensively presents various important aspects of thermal management in electric machines with the main focus on transportation applications. Design considerations, challenges, and methods for enhanced thermal management are discussed. Fundamental thermal properties of common materials are presented and sources of losses in various parts of machines are explained. Furthermore, typical cooling techniques and thermal analysis approaches for electric machines are reviewed in detail. This study will serve as a reference guideline for machine designers, who are interested in thermal management, and for thermal researchers working on electric machines.

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Analyzing of two types water cooling electric motors using computational fluid dynamics

Cited by 37 publications

References 6 publications

Optimization, 3D-Numerical Validations and Preliminary Experimental Tests of a Wound Rotor Synchronous Machine

Optimization, 3D-Numerical Validations and Preliminary Experimental Tests of a Wound Rotor Synchronous Machine

Research on the Electromagnetic-Heat-Flow Coupled Modeling and Analysis for In-Wheel Motor

Thermal management of electric machines

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