Enhancement of cooling performance in traction motor of electric vehicle using direct slot cooling method

Park, Joonbum; An, Jaehyuck; Han, Kyoungseok; Choi, Heung Sik; Park, Il Seouk

doi:10.1016/j.applthermaleng.2022.119082

Cited by 30 publications

(4 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Depending on the size of the electric vehicle motor, the heat generation power can range from 2.5-6 kW, 6-10 kW, and 10-15 kW, resulting in different thermal management requirements [55]. Two commonly used motor thermal management methods are air and liquid cooling [56][57][58]. Air cooling typically involves natural and forced air cooling and air impingement cooling [59].…”

Section: Electric Motor Thermal Management Requirementsmentioning

confidence: 99%

Review of Thermal Management Technology for Electric Vehicles

et al. 2023

View full text Add to dashboard Cite

The burgeoning electric vehicle industry has become a crucial player in tackling environmental pollution and addressing oil scarcity. As these vehicles continue to advance, effective thermal management systems are essential to ensure battery safety, optimize energy utilization, and prolong vehicle lifespan. This paper presents an exhaustive review of diverse thermal management approaches at both the component and system levels, focusing on electric vehicle air conditioning systems, battery thermal management systems, and motor thermal management systems. In each subsystem, an advanced heat transfer process with phase change is recommended to dissipate the heat or directly cool the target. Moreover, the review suggested that a comprehensive integration of AC systems, battery thermal management systems, and motor thermal management systems is inevitable and is expected to maximize energy utilization efficiency. The challenges and limitations of existing thermal management systems, including system integration, control algorithms, performance balance, and cost estimation, are discussed, along with potential avenues for future research. This paper is expected to serve as a valuable reference for forthcoming research.

show abstract

Section: Electric Motor Thermal Management Requirementsmentioning

confidence: 99%

Review of Thermal Management Technology for Electric Vehicles

et al. 2023

View full text Add to dashboard Cite

show abstract

“…One of the configurations showed the lowest magnetic and winding temperatures of 108 • C and 106 • C with an efficiency of 93.72%. Park et al [16] (2022) demonstrated the superiority of direct slot cooling with a 66%, 94% and 35% higher current density compared to water jacket cooling, end-tip cooling and channel cooling, respectively. Huang et al [17] (2012) reduced the average temperature of a stator by a factor of two for direct cooling with grooves between stator and housing compared to indirect water jacket cooling.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Characteristics of an Electric Motor with Oil-Dripping Cooling under Overload Conditions

Kang,

Garud,

Park

et al. 2024

Symmetry

View full text Add to dashboard Cite

The continuously increasing energy density of electric motors to match the performance of electric vehicles with internal-combustion-engine vehicles demands an advanced cooling strategy. Direct dripping/spray cooling is one of such potential cooling strategies to replace the conventional cooling method for achieving the desired thermal management of next-generation electric motors. In the present work, the heat transfer characteristics of an electric motor with oil-dripping cooling were experimentally investigated considering overload operating conditions. An experimental set-up comprising a 15 kW electric motor and an oil-dripping cooling system was developed. The experimental data were used to evaluate the maximum temperature, heat transfer coefficient and power consumption under the influence of a dripping hole diameter (2 mm, 3 mm, 4 mm), oil flow rate (8 LPM, 12 LPM, 16 LPM) and overload operating power (8.28 kW, 12.05 kW, 14.21 kW). The symmetrical oil distribution over the electric motor and the superior heat transfer from the electric motor to the oil was achieved when the oil-dripping cooling system was designed with the combination of a 4 mm dripping hole diameter and a 12 LPM oil flow rate. The combination of the 4 mm dripping hole diameter and 12 LPM oil flow rate showed the lowest maximum temperatures of 31.9 °C and 46.3 °C for electric motor under overload operating powers of 8.28 kW and 14.21 kW, respectively. In addition, the highest heat transfer coefficient of 7528.61 W/m2-K and lowest power consumption of 18.07 W were achieved for the oil-dripping cooling system with the combination of a 4 mm dripping hole diameter and 12 LPM oil flow rate. The best combination of the operating parameters is proposed for developing the oil-dripping cooling system that enables superior heat transfer characteristics and, thus, an enhanced thermal management of electric motors under overload conditions.

show abstract

“…The analysis methods of motor cooling systems are divided into two methods: the experimental method and the numerical simulation method [14][15][16]. Whether the motor cooling system is water-cooled, air-cooled or oil-cooled, the convective heat transfer area (CHTA), the average convective heat transfer coefficient (CHTC) and the convective thermal resistance (CTR) are the main standards for cooling performance [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Experiment and Simulation Study on the Cooling Performance of Oil-Cooling PMSM with Hairpin Winding

Yang,

Cai,

Xie

et al. 2024

Machines

View full text Add to dashboard Cite

In this paper, the cooling performance of oil-cooling PMSM with hairpin winding under various oil parameters is analyzed via a simulation and an experiment. The effects of oil jet positions, oil temperatures, and oil flow rates on the cooling performance are analyzed. It is found that increasing the oil temperature in the range of 20 °C to 60 °C, increasing the flow rate of oil jets whose position angle is from 15° to 45°, and increasing the flow rate in the range of 1 L/min to 2 L/min will significantly improve the cooling performance. The apertures of the oil spray ring are optimized using the Taguchi algorithm. The cooling performance is the best when the flow ratio is m(0°):m(15°):m(30°):m(45°):m(60°):m(75°) = 4%:19%:10%:10%:4%:4%. This study provides a guide for the design of the oil-cooling system for the hairpin winding of the PMSM.

show abstract

Enhancement of cooling performance in traction motor of electric vehicle using direct slot cooling method

Cited by 30 publications

References 21 publications

Review of Thermal Management Technology for Electric Vehicles

Review of Thermal Management Technology for Electric Vehicles

Heat Transfer Characteristics of an Electric Motor with Oil-Dripping Cooling under Overload Conditions

Experiment and Simulation Study on the Cooling Performance of Oil-Cooling PMSM with Hairpin Winding

Contact Info

Product

Resources

About