Shaft cooling and the influence on the electromagnetic performance of traction motors

Gai, Yaohui; Kimiabeigi, Mohammad; Widmer, James D.; Chong, Yew Chuan; Goss, James; SanAndres, Unai; Staton, D.A.

doi:10.1109/iemdc.2017.8002307

Cited by 19 publications

(11 citation statements)

References 17 publications

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“…By breaking down the instantaneous characteristics into time‐averaged and fluctuating components, other unknown quantities can be introduced. In order to solve these unknowns, eddy viscosity turbulent models are usually adopted for practical engineering calculations [19]. However, this kind of eddy viscosity model has gained a long‐standing recognition for being unable to suitably predict rotating flow.…”

Section: Computational Fluid Dynamicsmentioning

confidence: 99%

Numerical prediction and measurement of pressure drop and heat transfer in a water‐cooled hollow‐shaft rotor for a traction motor application

Gai

et al. 2021

IET Electric Power Appl

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This article addresses the rotating effect on the pressure loss and heat transfer coefficient (HTC) of a hollow‐shaft rotor cooling system for an automotive traction motor. Firstly, a numerical model based on computational fluid dynamics (CFD) was established to fully understand the mechanism of rotational flow patterns. Experiments were then performed to measure and compare heat exchange and pressure loss between rotating and stationary conditions with the assistance of an analytical thermal model. Finally, trends of pressure drop and HTC at various rotational rates were explained in detail. Based on CFD simulations and experimental prototype testing, two opposite effects: boosting or diminishing on pressure drop and heat transfer due to rotation have been identified. Moreover, the rotation can significantly improve the overall HTC and pressure loss of an axial turbulent flow. As a result, a significant drop in terms of rotor temperature is identified for an automotive traction motor when such a rotor cooling system is implemented.

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Section: Computational Fluid Dynamicsmentioning

confidence: 99%

Numerical prediction and measurement of pressure drop and heat transfer in a water‐cooled hollow‐shaft rotor for a traction motor application

Gai

et al. 2021

IET Electric Power Appl

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“…The continuity equation and the Reynolds averaged Navier-Stokes (RANS) equation, which are the conservation of mass and momentum equations, respectively, were used as the governing equations for fluid flow analysis, as in [14]. The realizable k was applied to the turbulence model [15].…”

Section: Fluid Flow Analysis Governing Equationsmentioning

confidence: 99%

“…where u d is as follows: The leakage flow rate q in the equation is assumed as shown in Equation (15).…”

Section: Design Of the Helical-grooved Self-cooling Casementioning

confidence: 99%

Electromagnetic Field Analysis and Design of a Hermetic Interior Permanent Magnet Synchronous Motor with Helical-Grooved Self-Cooling Case for Unmanned Aerial Vehicles

2021

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As unmanned aerial vehicles expand their utilization and coverage, research is in progress to develop low-weight and high-performance motors to efficiently carry out various missions. An electromagnetic field interior permanent magnet (IPM) motor was designed and analyzed in this study that improved the flight performance and flight duration of an unmanned aerial vehicle (UAV). The output power and efficiency of a conventional commercial UAV motor were improved by designing an IPM motor of the same size, providing high power output and high-speed operation by securing high power density, wide speed range, and mechanical stiffness. The cooling performance and efficiency of the drive motor were improved without requiring a separate power source for cooling by introducing the helical-grooved self-cooling case, which has a low heat generation structure. Furthermore, the motor is oil-cooled through rotating power without a separate power source, reducing the weight of the UAV. The heat dissipation characteristics were verified by fabricating a prototype and taking actual measurements to verify the validity of the heat dissipation characteristics. The results of this study are expected to improve the flight duration and performance of UAVs and contribute to the efficiency of the design of a UAV drive motor.

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“…As a rotary part, the direct liquid cooling apparatus of a rotor is difficult to manufacture. As a results, a hollow shaft cooling system [65] as an indirect way of dissipating heat can be employed. Fig.…”

Section: A Housing Water Jacketmentioning

confidence: 99%

Cooling of Automotive Traction Motors: Schemes, Examples, and Computation Methods

Gai

Kimiabeigi

Chong

et al. 2019

IEEE Trans. Ind. Electron.

230

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This paper presents a comprehensive overview of the latest studies and analyses of the cooling technologies and computation methods for the automotive traction motors. Various cooling methods, including the natural, forced air, forced liquid and phase change types, are discussed with the pros and cons of each method being compared. The key factors for optimizing the heat transfer efficiency of each cooling system are highlighted here. Furthermore, the real life examples of these methods, applied in the latest automotive traction motor prototypes and products, have been set out and evaluated. Finally, the analytical and numerical techniques describing the nature and performance of different cooling schemes have been explained and addressed. This paper provides guidelines for selecting the appropriate cooling methods and estimating the performance of them in the early stages of their design. Index Terms-Automotive applications, cooling, traction motors, thermal analysis, numerical analysis. NOMENCLATURECross section area of heat path (m 2 ). , Linear current density (kA/m). , Inlet and outlet cross section areas (m 2 ). Specific heat capacity (J/kg). Diameter (m). , Friction loss factor (dimensionless). Gravitational attraction force (m/s 2 ). Grashof number (dimensionless). Fin extension (m). ℎHeat transfer coefficient (W/m 2 K). ℎLatent heat (kJ/kg). Loss coefficient (dimensionless).

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Shaft cooling and the influence on the electromagnetic performance of traction motors

Cited by 19 publications

References 17 publications

Numerical prediction and measurement of pressure drop and heat transfer in a water‐cooled hollow‐shaft rotor for a traction motor application

Numerical prediction and measurement of pressure drop and heat transfer in a water‐cooled hollow‐shaft rotor for a traction motor application

Electromagnetic Field Analysis and Design of a Hermetic Interior Permanent Magnet Synchronous Motor with Helical-Grooved Self-Cooling Case for Unmanned Aerial Vehicles

Cooling of Automotive Traction Motors: Schemes, Examples, and Computation Methods

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