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Quantitative analysis of the influence of eccentricity on the thermal characteristics of in-wheel motor

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Abstract

An in-wheel motor (IWM) drive system highly integrates the drive motor, deceleration mechanism, and brake, among others, in the wheel, resulting in difficulty dissipating heat. The uneven temperature distribution of the motor is caused by its eccentricity owing to road excitation, tire bounce, and installation errors. This non-uniformity generates thermal stress that endangers motor operation and also causes the motor’s local temperature to increase substantially, thereby affecting its performance. To solve this problem, this study takes a 15 kW IWM as research object to quantitatively analyze the temperature distribution of rated and peak conditions of the motor under different eccentricities. The influence law of eccentricity on the thermal characteristics of IWM is obtained. Results show that the eccentricity of motor has substantial influence on the temperature distribution of stator and rotor.

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Abbreviations

A :

Point on a narrow air gap of the stator

A′:

Point on a narrow air gap of the rotor

B :

Point on the wide air gap of the stator

B′:

Point on the wide air gap of the rotor

O :

Center of the stator

O′:

Center of the rotor and rotation

ε :

Eccentricity ratio

e :

Eccentric distance

g 0 :

Average air gap length

α :

Convection heat dissipation coefficient

α 0 :

Surface heat dissipation coefficient in still air

k :

Coefficient of airflow blowing efficiency

θ :

Temperature outside the house wall

v :

Speed of air blowing on the outer surface

Re :

Reynolds number

Re cr :

Critical Reynolds number

n :

Motor speed

δ :

Air gap length

r 0 :

Rotor outer diameter

R 0 :

Inner diameter of the stator

λ eff :

Equivalent thermal conductivity of the air gap

υ :

Kinematic viscosity of air

η :

Relative change rate of the maximum temperature

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Acknowledgments

This research is supported by the National Natural Science Foundation of China (Grant Number 51775320) and sponsored by the Key Technology Research and Development Program of Shandong (Grant Number 2019GGX104069).

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Authors and Affiliations

  1. School of Transportation and Vehicle Engineering, Shandong University of Technology, 12 Zhangzhou Road, Zhangdian, Zibo, 255049, China

    Meng Yuan & Di Tan

Authors
  1. Meng Yuan
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  2. Di Tan
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Corresponding author

Correspondence to Di Tan.

Additional information

Meng Yuan obtained a B.Sc. in Engineering in Ludong University in June 2019. He is currently pursuing an M.Sc. in Vehicle Engineering in the School of Transportation, Shandong University of Technology. His current research interests include vehicle drive technology and multi-physical field coupling.

Di Tan received a Ph.D. from South China University of Technology, Guangzhou, China, in 2013. Since 2013, she has been an Associate Professor with the Automotive Engineering Group, Shandong University of Technology, Zibo, China. Her research interests inelude electric vehicles and drive technology.

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Yuan, M., Tan, D. Quantitative analysis of the influence of eccentricity on the thermal characteristics of in-wheel motor. J Mech Sci Technol 36, 991–1002 (2022). https://doi.org/10.1007/s12206-022-0145-3

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  • DOI: https://doi.org/10.1007/s12206-022-0145-3

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