Experimental and numerical study of stator end-winding cooling with impinging oil jet

Chen, Pin; Hassine, N. Ben; Ouenzerfi, Safouene; Harmand, Souad

doi:10.1016/j.applthermaleng.2022.119702

Cited by 12 publications

(4 citation statements)

References 21 publications

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“…A simple orifice jet nozzle is used with lubricating synthetic oil as the coolant liquid. A recent study by Chen et al [12] has shown that the use of restriction surfaces around the end-winding can significantly increase the heat extraction capability with jet impingement cooling. Therefore, both proposed thermal designs in this study use fluid flow restriction surfaces to improve the contact area between the fluid and winding.…”

Section: Proposed Jet Impingement Designmentioning

confidence: 99%

“…But, the hairpin end-windings have inherent air gaps and a complex geometry, which considerably decreases the ability of the impinging jet to wet the target surface. For instance, a radial jet without any flow restrictions is capable of only achieving an average heat transfer coefficient of 300 W/m 2 k [12]. The thermal performance of the impinging jet is influenced by the flow fluid flow pattern on the target surface.…”

Section: Proposed Thermal Design Analysismentioning

confidence: 99%

“…The empirical model proposed is capable of estimating heat transfer between the oil jet and winding with a maximum error of 6%. In a recent study by Chen et al [12] the cooling effect of a single jet nozzle placed on top of the end-winding was investigated using three different oil flow configurations. These configurations included the generic end-winding and two other configurations where an external and internal surface was constructed along the end-winding to facilitate coolant flow.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of Oil Jet Cooling in Electric Traction Motors with Hairpin Windings

Maddumage

Cairns

Paykani

2023

2023 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD)

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Hairpin winding technology, combined with direct oil jet impingement cooling, is a viable solution known to increase volumetric power density and efficiency in the next generation of traction motors. However, the coolant fluid interaction with the complex winding geometry has not yet been fully examined; specifically, with the use of high-fidelity CFD simulations. Thus, the present work investigates the radial and axial oil impinging jets in a hairpin winding motor using multi-phase simulation. The study first analyses power losses and temperature distribution of the motor under the Worldwide Harmonised Light Vehicle Test Procedure (WLTP). Next, the performance of axial and radial jet impingement is numerically analysed by considering the fluid flow. Finally, the two configurations are compared in terms of their oil film formation rate. The results indicate that the maximum power losses observed in typical driving conditions are considerably lower than the maximum losses predicted for the complete operational region of the motor. Moreover, the axial impinging jet shows a higher oil film formation rate compared to a radial jet impingement configuration within the examined conditions.

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Section: Proposed Jet Impingement Designmentioning

confidence: 99%

Section: Proposed Thermal Design Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Study of Oil Jet Cooling in Electric Traction Motors with Hairpin Windings

Maddumage

Cairns

Paykani

2023

2023 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD)

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“…Compared to water, oil can come into direct contact with the winding and remove the heat generated by the winding. Therefore, to meet the heat dissipation requirements of the winding, hairpin winding motors are typically oil-cooling [7,8].…”

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

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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.

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Effective thermal management scheme foradvanced traction motors with internal oil-and external water-cooling systems

Lee,

2024

J Mech Sci Technol

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Experimental and numerical study of stator end-winding cooling with impinging oil jet

Cited by 12 publications

References 21 publications

Numerical Study of Oil Jet Cooling in Electric Traction Motors with Hairpin Windings

Numerical Study of Oil Jet Cooling in Electric Traction Motors with Hairpin Windings

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

Effective thermal management scheme foradvanced traction motors with internal oil-and external water-cooling systems

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