Improved Thermal Modeling and Experimental Validation of Oil-Flooded High-Performance Machines With Slot-Channel Cooling

Zhang, Fengyu; Gerada, David; Xu, Zeyuan; Zhang, Xiaochen; Zhang, He; Gerada, Chris; Zhu, Ming‐Qiang; Xia, L.; Zhang, Wei

doi:10.1109/tte.2021.3106819

Cited by 18 publications

(6 citation statements)

References 38 publications

(54 reference statements)

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“…The allowed conductor current density is a standard measure for assessing the capability of the cooling system for synchronous motors since most of the losses occur in the stator winding for this kind of motors. Therefore, an oilflooded system, which can afford up to 30 A/mm 2 [52], has been chosen as the cooling system for the stator stack and its windings.…”

Section: A Stator Coolingmentioning

confidence: 99%

Design of a HTS 2 MW Electric Motor for Single-Aisle Regional Aircraft

Alvarez,

Satrústegui,

Scheifler

et al. 2023

IEEE Access

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This paper presents the design of a 2 MW superconducting electric machine capable of replacing a conventional regional aircraft turbine. The main objective of this work is to advance in the path towards the more-electric aircraft, by incorporating and assessing in the same design technologies such as a superconducting rotor and its cooling by means of helium at cryogenic temperatures, the skewed armature winding or the oil-flooded cooling of the stator, to obtain high specific power density and efficiency values. Although the use of these technologies is well known in the literature, no work is found to implement all of them simultaneously, which poses great challenges both for their subsequent manufacture and later performance. After showing and justifying each element of the design of the electric machine, the electromagnetic performance of the motor and of the superconducting coils is assessed, it is thermally evaluated so that it does not exceed the strict temperature limits and a mechanical analysis of the elements of the motor is also carried out. The main finding of this work is the validation of the proposed model, and that, even though the designed engine is feasible at the proposed power level, the specific power density and efficiency values would improve in the case of upscaling the engine for implementation in larger aircraft.INDEX TERMS Aircraft propulsion, electric machine, high-power, high-temperature superconductor, regional aircraft.

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Section: A Stator Coolingmentioning

confidence: 99%

Design of a HTS 2 MW Electric Motor for Single-Aisle Regional Aircraft

Alvarez,

Satrústegui,

Scheifler

et al. 2023

IEEE Access

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show abstract

“…It can be seen from the iron core temperature contour plot that the temperature of the rear end is higher than the temperature of the front end, and the highest temperature of the iron core appears on the surface of the rear tooth. Indirect slot cooling is as well considered as an efficient cooling technique [36], [37]. However, the coolant can only flow in the pipes, which prevents the end-windings and stator core from being adequately cooled.…”

Section: Sourcementioning

confidence: 99%

Convective Heat Transfer Characteristics on End-Winding of Stator Immersed Oil-Cooled Electrical Machines for Aerospace Applications

Wang

Fan

et al. 2022

IEEE Trans. Transp. Electrific.

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The stator immersed oil cooling has emerged as a promising thermal management method for high power density electric machines applied in aerospace applications. However, due to the complex geometry of end-windings, the research on the convective heat transfer coefficient (CHTC) for the flooded stator is still at infancy. This paper investigates the convective heat transfer characteristics on end-windings of stator immersed oil-cooled electrical machines by computational fluid dynamics (CFD) methods and experiments implemented on a motorette. The variation law of the CHTCs of end-winding with flow rate is thoroughly investigated. Subsequently, new dimensionless correlations are defined using Nusselt numbers as a function of Reynolds numbers, which are further applied into a detailed lumped-parameter thermal network (LPTN) for rapid evaluation of temperature distribution. Finally, the obtained simulation results are verified by local temperature measurements. The experimental results also show that the proposed stator immersed oil-cooled structure can withstand a current density of up to 30A/mm 2 with a corresponding continuous power density of 6.8kW/kg.

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“…The structure of the oil circulation system is improved and the heat dissipation capacity is improved [12]. Channel cooling is considered to be an effective cooling technology, which is comparable to the traditional cooling system either as an independent method or as a secondary heat transfer path [13]. The method of adding water-cooled pipes to the teeth is studied, and the optimum diameter and number of parallel water-cooled pipes are determined, which effectively improves the heat dissipation efficiency [14].…”

Section: Introductionmentioning

confidence: 99%

Cooling Structure Design of High-Speed Permanent Magnet Synchronous Machine With Axial Ventilation Self-Cooling Rotor

Luo,

Zhang,

Wang

et al. 2024

IEEE Access

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In order to address the challenges of high loss density, difficult heat dissipation, and irreversible demagnetization in high temperature of high-speed permanent magnet machine, an innovative cooling structure with axial ventilation and self-cooling rotor is proposed to enhance temperature distribution. The cooling efficiency of the cooling structure is defined, and the influence of the rotor vent on the electromagnetic and air friction loss is analyzed. The governing equation for the fluid flow in a rotating pipe is derived from a fluid model analysis of a ventilation hole rotating at any angle to the axis of rotation. The calculated results are validated against the results obtained from computational fluid dynamics. The sensitivity of rotor cooling performance to various control factors using the variance index method. Subsequently, the cooling structure was enhanced based on the findings of the analysis. The calculation results indicate that the heat dissipation effect of the axial ventilation self-cooled rotor has decreased by 4.17 ℃ compared to before the improvement. The temperature rise experiment verified the accuracy of temperature calculation and the effectiveness of the cooling structure, providing strong support for the design of axial self-ventilation cooling system for high-speed machines.INDEX TERMS cooling structure, heat dissipation, high-speed machine, permanent magnet synchronous machine

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Improved Thermal Modeling and Experimental Validation of Oil-Flooded High-Performance Machines With Slot-Channel Cooling

Cited by 18 publications

References 38 publications

Design of a HTS 2 MW Electric Motor for Single-Aisle Regional Aircraft

Design of a HTS 2 MW Electric Motor for Single-Aisle Regional Aircraft

Convective Heat Transfer Characteristics on End-Winding of Stator Immersed Oil-Cooled Electrical Machines for Aerospace Applications

Cooling Structure Design of High-Speed Permanent Magnet Synchronous Machine With Axial Ventilation Self-Cooling Rotor

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