Temperature Field Accurate Modeling and Cooling Performance Evaluation of Direct-Drive Outer-Rotor Air-Cooling In-Wheel Motor

Chai, Feng; Tang, Yue; Pei, Yulong; Liang, Peidong; Gao, Hongwei

doi:10.3390/en9100818

Cited by 24 publications

(17 citation statements)

References 17 publications

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“…The maximum motor temperature allowed for the cooling jacket design is set to 373 K [20]. Kral et al [17] studied thermal model of totally enclosed water-cooled induction machine for the purpose of traction applications.…”

Section: Numerical Simulation Resultsmentioning

confidence: 99%

“…In addition to regular operation, these motors may undergo overload periods with currents exceeding the rated value [19]. The cooling jacket design should ensure that the maximum temperature does not exceed the allowed limit [20,21]. Also in designing cooling jacket for EV motors it is important to consider the pumping power requirement for the coolant flow.…”

Section: Introductionmentioning

confidence: 99%

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Three-D Numerical Thermal Analysis of Electric Motor with Cooling Jacket

Rehman

Seong

2018

Energies

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Abstract:The need of a sustainable clean future has paved the way for environmental friendly electric vehicle technology. In electric vehicles, overloading is limited by the maximum temperature rise in the electric motor. Although an improved cooling jacket design is of vital importance in lowering the maximum temperature of the motor, there has not been as much study in the thermal analysis of motors compared to electromagnetic design studies. In this study, a three-dimensional steady state numerical method is used to investigate the performance of a cooling jacket using water as the primary coolant of a three-phase induction motor with special emphasis on the maximum temperature and the required pumping power. The effective thermal conductivity approach is employed to model the stator winding, stator yoke, rotor winding and rotor yoke. Heat transfer by induced air is treated as forced convection at the motor ends and effective conductivity is obtained for air in the stator-rotor gap. Motor power losses, i.e., copper and iron losses, are treated as heat generation sources. The effect of bearings and end windings is not considered in the current model. Pressure and temperature distributions under various coolant flow rates, number of flow passes and different cooling jacket configurations are obtained. The study is successful in identifying the hot spots and understanding the critical parameters that affect the temperature profile. The cooling jacket configuration affects the region of maximum temperature inside the motor. Increasing the number of flow passes and coolant flow rate decreases maximum motor temperature but results in an increase in the pumping power. Of the cooling jacket configurations and operating conditions investigated, a cooling jacket with six passes at a flow rate of 10 LPM with two-port configuration was found to be optimal for a 90-kW induction motor for safe operation at the maximum output.

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Section: Numerical Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Three-D Numerical Thermal Analysis of Electric Motor with Cooling Jacket

Rehman

Seong

2018

Energies

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“…In general, typical cooling techniques for electric machine applications are based on air cooling systems [9][10][11], phase-change material cooling systems [12,13] and liquid cooling systems [14][15][16][17][18]. Because liquids have a higher heat transfer capacity than air of the same mass, in applications where there is a large amount of heat generated continuously, the liquid cooling systems are more suitable than air cooling systems in terms of heat transfer performance and size of the cooling system.…”

Section: Introductionmentioning

confidence: 99%

On Heat Transfer Performance of Cooling Systems Using Nanofluid for Electric Motor Applications

Deriszadeh

Monte

2020

Entropy

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This paper studies the fluid flow and heat transfer characteristics of nanofluids as advance coolants for the cooling system of electric motors. Investigations are carried out using numerical analysis for a cooling system with spiral channels. To solve the governing equations, computational fluid dynamics and 3D fluid motion analysis are used. The base fluid is water with a laminar flow. The fluid Reynolds number and turn-number of spiral channels are evaluation parameters. The effect of nanoparticles volume fraction in the base fluid on the heat transfer performance of the cooling system is studied. Increasing the volume fraction of nanoparticles leads to improving the heat transfer performance of the cooling system. On the other hand, a high-volume fraction of the nanofluid increases the pressure drop of the coolant fluid and increases the required pumping power. This paper aims at finding a trade-off between effective parameters by studying both fluid flow and heat transfer characteristics of the nanofluid.

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“…Takabi and Khonsari 4 studied the evolution of temperature with time in a deep-groove ball bearing in an oil-bath lubrication system both experimentally and analytically. Chai et al 5 used an outer-rotor air-cooling in-wheel motor as an example, the temperature ﬁeld of the motor was calculated numerically, and the results are experimentally veriﬁed. Long et al 6 developed an analytical approach and performed the experiment for estimating frictional heat flux and heat transfer coefficients of gear teeth in high-speed operational conditions and accounted for the effect of oil mist as a cooling medium.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of the triple-phase asynchronous motor-reducer coupling system by thermal network method

Chen

Zhuang

Deng

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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As the core components of mechanical power system, triple-phase asynchronous motor and reducer are required strictly for temperature control. In this paper, the triple-phase asynchronous motor and the reducer are regarded as a coupling system, and thermal network method is used to predict the temperature field distribution of the coupling system. The predicted temperature of the thermal network method is consistent with the experimental result and the finite-element analysis. Furthermore, analysis shows that motor output power, coefficient of friction between teeth and lubricating oil parameters have a great effect on reducing the temperature of the coupling system.

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Temperature Field Accurate Modeling and Cooling Performance Evaluation of Direct-Drive Outer-Rotor Air-Cooling In-Wheel Motor

Cited by 24 publications

References 17 publications

Three-D Numerical Thermal Analysis of Electric Motor with Cooling Jacket

Three-D Numerical Thermal Analysis of Electric Motor with Cooling Jacket

On Heat Transfer Performance of Cooling Systems Using Nanofluid for Electric Motor Applications

Thermal analysis of the triple-phase asynchronous motor-reducer coupling system by thermal network method

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