Research on Magnetic–Thermal Coupling Calculation of Outer Rotor Permanent Magnet Motor Based on Magnetic Circuit Method and Thermal Network Method

Zhike Xu, Yewei Wang, Long Jin (), Hongbin Zhang and Jun Hong
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Zhike Xu: School of Electrical Engineering, Southeast University, Nanjing 210000, China
Yewei Wang: School of Electrical Engineering, Southeast University, Nanjing 210000, China
Long Jin: School of Electrical Engineering, Southeast University, Nanjing 210000, China
Hongbin Zhang: School of Turbine Electrical and Intelligent Engineering, Jiangsu Maritime Institute, Nanjing 210000, China
Jun Hong: School of Electrical Engineering, Southeast University, Nanjing 210000, China

Energies, 2025, vol. 18, issue 8, 1-22

Abstract: In this paper, a thermal analysis method of electric motor based on the magnetic equivalent circuit method and the ensemble thermal network method is proposed, which is convenient for modelling, fast for calculation, and is able to obtain the accurate temperature distribution of the motor quickly. Firstly, on the basis of the proposed unitary magnetic circuit model, all kinds of losses of the electric motor are analyzed and calculated. Subsequently, a thermal network model is established, and multilayered modelling is carried out on the rotor and the stator part in order to obtain more accurate calculation results. In the thermal network solution, the two cases of temperature affecting only the copper resistance and temperature affecting the working performance of permanent magnets at the same time are considered, respectively, and the calculation results in the two cases are compared with the finite element temperature field calculation results, which verifies the validity of the calculation method proposed in this paper.

Keywords: outer rotor permanent magnet motor; temperature field analysis; equivalent magnetic circuits; lumped thermal network method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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