Hierarchical thermal network analysis of axial‐flux permanent‐magnet synchronous machine for electric motorcycle

Chen, Qixu; Liang, Deliang; Gao, Lin; Wang, Qingshan; Liu, Yibin

doi:10.1049/iet-epa.2017.0719

Cited by 19 publications

(18 citation statements)

References 18 publications

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“…where T 0 is the temperature of the central point of the wire. Eventually, comparing (6)- (9) and (12), the radial ETC of the equivalent conductor can be written by λ radial = 0.293π ⋅ λ we λ wh λ im λ wh λ im + 2λ we λ im ln(r 2 /r 1 ) + 2λ we λ wh ln 1.08(d/r 2 )…”

Section: Etc Derivation Of Windingmentioning

confidence: 99%

“…In the frame, stator iron and rotor, the material property is unique and the length of the thermal path is easy to determine. Therefore, the analytical method is suitable for calculating the LPTN parameter of these regions according to the motor sizes and material thermal conductivity (TC) [8,9]. However, the wirewound winding used in FACMs is composed of multiple materials and the slot boundaries are not regular.…”

Section: Introductionmentioning

confidence: 99%

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Improved thermal model of forced air‐cooled motors considering heat transfer in wire‐wound winding and end region

Liu

et al. 2020

IET Electric Power Applications

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This study introduces an innovative thermal model to accurately consider the heat transfer in the winding and end region of forced air-cooled motors, which is an attractive supplement of classical lumped parameter thermal network approaches. Through coupling of the analytical method and local numerical calculations, the effective length of the winding heat path and the air convection of the end region can be exactly considered. An improved analytical derivation of the equivalent thermal conductivity of the winding is applied. To reduce the errors caused by the irregular slot type, the winding thermal resistance is calculated by the 2D numerical calculations. After that, the 3D model of the end region is built to accurately calculate the end air velocity and end convection resistance. The unknown boundaries of the 3D end model are determined by a coupling iteration. The errors of the winding thermal resistance and end convection resistance are less than 3.12 and 11%, respectively, verified by simulations and temperature tests of the prototype. Finally, the mechanism of the end region convection and its influence on the temperature rise of the entire motor are discussed in detail.

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Section: Etc Derivation Of Windingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved thermal model of forced air‐cooled motors considering heat transfer in wire‐wound winding and end region

Liu

et al. 2020

IET Electric Power Applications

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show abstract

“…Many scholars have designed an in-wheel motor to reduce electromagnetic losses and improve cooling performance [18]- [21]. The motor has different cooling modes depending on the operating fluid: liquid-cooled [22], [23], oil-cooled [24], [25], and air-cooled [26]. The air-cooled mode has the advantages of a simple cooling system configuration.…”

Section: Introductionmentioning

confidence: 99%

Multiphysics Analysis of an Axial-Flux In-Wheel Motor With an Amorphous Alloy Stator

Zhang

Liang

et al. 2020

IEEE Access

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This paper presents a novel yokeless and segmented armature (YASA) axial-flux in-wheel motor with amorphous magnetic material (AMM) stator cores for a solar-powered electric vehicle. Although this new axial-flux in-wheel motor has many advantages such as high efficiency, shorter axial length, and high power density, its working condition is complicated. In-wheel motors are usually operated in electromagnetic, thermal, and other multiphysics environments. Increasing the performance requirements of in-wheel motors, such as power density, efficiency, and reliability, requires a multiphysics design approach. The focus of this paper is on the analysis of electromagnetic characteristics, losses, temperature distribution, mechanical behavior and other characteristics of the axial-flux in-wheel motor. The back electromotive force (EMF) and electromagnetic torque of the motor with harmonic current are obtained by the 3-D finite element method (FEM). The permanent magnet (PM) eddy-current losses when using different PM shapes are studied. The equivalent thermal model of the tape-wound AMM stator segments and the windings are established, and the temperature distribution of the motor is obtained. The mechanical behavior of the stator segments and the rotor disks when the motor is eccentric and axially offset is analyzed, and the structural strength of the motor is evaluated. Finally, a prototype of the motor is fabricated, and the electromagnetic performance and temperature of the motor are tested to verify the accuracy of the multiphysics design approach.

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“…In recent years, AFPMSM's multi-physics analysis has also made great progress. The authors of Reference [16][17][18] used the steady-state heat conduction equation method, the T-type thermal network model method, and the AFPMSM full prediction heat transfer coefficient model with magnet geometry parameters to perform thermal analysis on AFPMSM. The authors of Reference [19][20][21][22] conducted a detailed study of the AFPMSM's degaussing fault identification.…”

Section: Introductionmentioning

confidence: 99%

Study on the Electromagnetic Design and Analysis of Axial Flux Permanent Magnet Synchronous Motors for Electric Vehicles

et al. 2019

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In order to provide a complete solution for designing and analyzing the axial flux permanent magnet synchronous motor (AFPMSM) for electric vehicles, this paper covers the electromagnetic design and multi-physics analysis technology of AFPMSM in depth. Firstly, an electromagnetic evaluation method based on an analytical algorithm for efficient evaluation of AFPMSM was studied. The simulation results were compared with the 3D electromagnetic field simulation results to verify the correctness of the analytical algorithm. Secondly, the stator core was used to open the auxiliary slot to optimize the torque ripple of the AFPMSM, which reduced the torque ripple peak-to-peak value by 2%. From the perspective of ensuring the reliability, safety, and driving comfort of the traction motor in-vehicle working conditions, multi-physics analysis software was used to analyze and check the vibration and noise characteristics and temperature rise of several key operating conditions of the automotive AFPMSM. The analysis results showed that the motor designed in this paper can operate reliably.

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Hierarchical thermal network analysis of axial‐flux permanent‐magnet synchronous machine for electric motorcycle

Cited by 19 publications

References 18 publications

Improved thermal model of forced air‐cooled motors considering heat transfer in wire‐wound winding and end region

Improved thermal model of forced air‐cooled motors considering heat transfer in wire‐wound winding and end region

Multiphysics Analysis of an Axial-Flux In-Wheel Motor With an Amorphous Alloy Stator

Study on the Electromagnetic Design and Analysis of Axial Flux Permanent Magnet Synchronous Motors for Electric Vehicles

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