Newly Developed Motor Cooling Method Using Refrigerant

Fujita, Hidemasa; Itoh, Atsushi; Urano, Takashi

doi:10.3390/wevj10020038

Cited by 26 publications

(10 citation statements)

References 5 publications

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“…Depending on the operating conditions, the driving motors for EVs have different cooling modes: oil, 139 air, 135,140 and water. 141 Based on the capability of the motor, the most appropriate mode is selected. While aircooled mode has the advantage of a simple cooling system design for its cooling capacity, it is relatively limited, making it challenging to apply to a miniaturised high-capacity motor.…”

Section: Thermal Management Challenges In Evsmentioning

confidence: 99%

See 1 more Smart Citation

A review on potentials and challenges of nanolubricants as promising lubricants for electric vehicles

Mustafa

Dassenoy

Sarno

et al. 2021

Lubrication Science

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The most remarkable difference between electric vehicles (EVs) and conventional ones is the fuel burning dependency of the internal combustion engine, while the emerging EVs operate on electric motors. These alternations create staggering shifts in both lubricants' market demand and performance specifications. Lubricants for electrical powertrain constitutes greases, transmission oils, and lubricants for auxiliary systems and do not rely on engine oils as internal combustion vehicles. The new standards will be more focused on lubricants' electrical properties such as breakage voltage and conductivity, coupled with tribological performance under high rpm, corrosion resistance and thermal management benchmarks. This paper thematically reviews the different studies performed with nanolubricants, and how they match EVs' operational requirements. Conclusions from this study can be considered as guidelines for the potential application of nanolubricants in EVs and possible future research that can be accomplished on the topic.

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Section: Thermal Management Challenges In Evsmentioning

confidence: 99%

“…Depending on the operating conditions, the driving motors for EVs have different cooling modes: oil, 139 air, 135,140 and water 141 . Based on the capability of the motor, the most appropriate mode is selected.…”

Section: Thermal Management Challenges In Evsmentioning

confidence: 99%

A review on potentials and challenges of nanolubricants as promising lubricants for electric vehicles

Mustafa

Dassenoy

Sarno

et al. 2021

Lubrication Science

View full text Add to dashboard Cite

show abstract

“…An example for cooling the windings by a ceramic direct winding heat exchangers with water/glycol mixture is given by Sixel et al [154]. • Electric traction motor cooling jackets with refrigerant or evaporation cooling [155,156] • Winding cooling by fluid pool boiling [157,158] • Hollow winding conductors with integrated phase-change material [159] • Rotor/stator cooling by heat pipes or pulsating heat pipes [160][161][162][163][164][165] • Rotor/shaft cooling by thermosiphons [151,152] The heat transfer phenomena and design in evaporative cooling concepts are not part of this research. The referenced sources are given for further information.…”

Section: G Direct Winding Cooling Techniquesmentioning

confidence: 99%

Traction Motor Cooling Systems: A Literature Review and Comparative Study

Gronwald

Kern

2021

IEEE Trans. Transp. Electrific.

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More efficient cooling systems are an enabler for the increase in power-density in an electric traction motor. Contemplating to existing reviews, this paper presents a comprehensive collection of heat transfer mechanisms for the different heat removal techniques used in electric traction motors. In the first section, an overview of various cooling concepts in existing and future traction motors is presented and the cooling approaches are compared. The following literature review compiles geometry-based calculation formulas of the different mechanisms of cooling heat transfer applied in motor-technology. Furthermore general heat transfer phenomena appearing in electric traction motors are reviewed and compiled for easy access. Various specifically relevant aspects, including rotor shaft cooling, different spray cooling concepts, different air convection phenomena, bearing heat transfer and the stator-housing-contact, are examined in more detail. For validation of the review result, based on a well-known motor design a thermal analysis and comparison of the different cooling methods is carried out. Modeling is done with a lumped parameter thermal networks (LPTN). The paper concludes demonstrating the advantages and disadvantages of the different cooling concepts based on the collection of modeling data.

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“…The heat emitted from the electric motor consists of Joule losses, iron losses, stream load losses, and mechanical losses [ 1 , 2 , 3 ]. For heat removal from the vehicle motor, oil cooling has been used in terms of efficiency; the oil (electrically-insulated coolant) can directly touch the heat source and exchange the heat from the motor [ 4 ]. For example, the stator coil shown in Figure 1 a, one of the main heat sources of the motor, is cooled by the oil poured from the nozzle holes above.…”

Section: Introductionmentioning

confidence: 99%

Coolant Wetting Simulation on Simplified Stator Coil Model by the Phase-Field Lattice Boltzmann Method

Sugimoto

Miyazaki

Kaneda

et al. 2022

Entropy

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Stator coils of automobiles in operation generate heat and are cooled by coolant poured from above. The flow characteristic of the coolant depends on the coil structure, flow condition, solid–fluid interaction, and fluid property, which has not been clarified due to its complexities. Since straight coils are aligned and layered with an angle at the coolant-touchdown region, the coil structure is simplified to a horizontal square rod array referring to an actual coil size. To obtain the flow and wetting characteristics, two-phase fluid flow simulations are conducted by using the phase-field lattice Boltzmann method. First, the flow onto the single-layered rod array is discussed. The wetting area is affected both by the rod gap and the wettability, which is normalized by the gap and the averaged boundary layer thickness. Then, the flow onto the multi-layered rod arrays is investigated with different rod gaps. The top layer wetting becomes longitudinal due to the reduction of the flow advection by the second layer. The wetting area jumps up at the second layer and increases proportionally to the below layers. These become remarkable at the narrow rod gap case, and finally, the dimensionless wetting area is discussed at each layer.

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Newly Developed Motor Cooling Method Using Refrigerant

Cited by 26 publications

References 5 publications

A review on potentials and challenges of nanolubricants as promising lubricants for electric vehicles

A review on potentials and challenges of nanolubricants as promising lubricants for electric vehicles

Traction Motor Cooling Systems: A Literature Review and Comparative Study

Coolant Wetting Simulation on Simplified Stator Coil Model by the Phase-Field Lattice Boltzmann Method

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