Conjugate Heat Transfer and CFD Modeling of Self-ventilated Traction Motors

Boscaglia, Luca; Bonsanto, Fabio; Boglietti, Aldo; Nategh, Shafigh; Scema, Claudio

doi:10.1109/ecce.2019.8913138

Cited by 8 publications

(3 citation statements)

References 23 publications

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“…At present, domestic and foreign experts and scholars have analyzed and compared the ventilation and cooling methods and end fixing structures of the variable speed power generation motor machine [4][5][6]. Many numerical calculations of the fluid and temperature fields inside the motor and the corresponding coupling fields have also been performed using the finite volume method for other types of motors [7][8][9][10][11][12]. The basis for the calculation of the physical fields inside the motor has been laid.…”

Section: Introductionmentioning

confidence: 99%

Study of Local Structural Changes on Air Cooling at the End of Rotor Windings for Variable Speed Pumped Storage Generator-Motor

Qiu¹,

Xiong²,

Hóu³

et al. 2022

Energy Engineering

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The shrink fit retaining ring is currently the easiest to install and the most widely used end fixed for structure AC excitation variable speed generator-motor rotor end windings. However, the current research on the effect of high strength sealing on the ventilation and heat dissipation performance of the end is not enough. In this paper, based on the actual structural parameters and periodic symmetry simplification, the three-dimensional coupled calculation model of fluid field and temperature field is established. After solving the fluid and thermal equations, the influence of the length of rotor support block, the height of rotor support block, and the number of rotor support block on the fluid flow and temperature distribution in the rotor end region of generator-motor is studied using the finite volume method. The rheological characteristics of the air in the rotor domain, such as velocity and interwinding flow, are analyzed. The law of temperature variation with local structure in the computational domain is studied. The variation law of cooling medium performance inside the large variable speed power generator motor is revealed.

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Section: Introductionmentioning

confidence: 99%

Study of Local Structural Changes on Air Cooling at the End of Rotor Windings for Variable Speed Pumped Storage Generator-Motor

Qiu¹,

Xiong²,

Hóu³

et al. 2022

Energy Engineering

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“…In order to ensure the temperature below the limits, a good thermal strategy should solve the main challenges from all aspects including the reduction of the heat sources, the choice of optimal materials and the use of high performance cooling system. Electrical machines can be cooled down in approximately 4 ways [6]: (1) air-cooling were the air is moved by an external blower or a shaft-mounted fan [11], [12]; (2) water-cooling [13], [14] in which the water inside ducts at the interface between stator and housing (e.g. water jacket) and kept below certain temperature through an heat exchanger; (3) direct oil-cooling [15] where the high insulation properties of the oil are used to wet directly the conductors enhancing the heat transfer; (4) combined oiland water-cooling [8] in which the water with the highest thermal conductivity is used to indirectly cool down the oil inside the motor.…”

Section: Introductionmentioning

confidence: 99%

Convective Heat Transfer Coefficients and Mechanical Loss Evaluation of Oil Splashing in Direct Cooled Electrically Excited Hairpin Motors

Boscaglia

Liu

Avsar

et al. 2022

2022 International Conference on Electrical Machines (ICEM)

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“…Meanwhile, the modelling technique for the aforementioned slot channel cooling thermal analysis presented in the existing literature is CFD, which is a very time demanding simulation approach [15,21] and therefore not straightforward to be used within a multidomain optimization environment. Computationally effective thermal model with CFD and Conjugate Heat Transfer (CHT) model implementation are investigated in [2,[22][23][24][25] for timeeffective thermal performance of the machine, where the copper loss increase with temperature is considered. Compared to CFD, lumped parameter thermal network (LPTN) is flexible and provides thermal results very quickly.…”

mentioning

confidence: 99%

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

Zhang

Gerada

et al. 2022

IEEE Trans. Transp. Electrific.

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Thermal management is often considered a bottleneck in the pursuit of the next generation electrical machines for electrified transportation with a step change in power density. Slot-channel cooling is considered to be an effective cooling technique, either as an independent method or as a secondary heat transfer path which compliments traditional cooling systems. The slotchannel specific geometry and position effects on the thermal benefits are not thoroughly investigated in literature, while previous work focuses on passing fluid through the un-used space left in between coils forming concentrated windings. In this paper, slot-channel cooling is implemented within an oil-flooded cooling system for a high power density motor used as a pump. A flexible and detailed lumped parameter thermal network (LPTN) is proposed for the cooling system, with the LPTN used to optimize the slot-channel dimensions and location for obtaining maximum thermal benefits. Finally, a surfacemount permanent magnet (SPM) machine with the optimized slot channel geometry is built and tested to validate the thermal model, experimentally achieving an armature continuous current density in excess of 30A/mm 2 . Index Terms-slot cooling, fully flooded oil cooling, thermal network, high speed, high power density, thermal management. I.INTRODUCTION

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Conjugate Heat Transfer and CFD Modeling of Self-ventilated Traction Motors

Cited by 8 publications

References 23 publications

Study of Local Structural Changes on Air Cooling at the End of Rotor Windings for Variable Speed Pumped Storage Generator-Motor

Study of Local Structural Changes on Air Cooling at the End of Rotor Windings for Variable Speed Pumped Storage Generator-Motor

Convective Heat Transfer Coefficients and Mechanical Loss Evaluation of Oil Splashing in Direct Cooled Electrically Excited Hairpin Motors

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

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