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 |  موضوع: بحث بعنوان Thermal and Mechanical Analysis of a 72/48 Switched Reluctance Motor for Low-Speed Direct-Drive Mining Applications الجمعة 25 مارس 2022, 1:44 am | |
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بحث بعنوان
Thermal and Mechanical Analysis of a 72/48 Switched Reluctance Motor for Low-Speed Direct-Drive Mining Applications
Esmail Elhomdy 1,2 , Zheng Liu 1 and Guofeng Li 1,*
1 School of Electrical Engineering, Dalian University of Technology, Dalian 116023, China
2 Faculty of Engineering, Blue Nile University, Blue Nile State 26613, Sudan
* Correspondence: guofenli@dlut.edu.cn; Tel.: +86-138-8962-6136
و المحتوى كما يلي :
Abstract: In the process of electric motor design, it is essential to predict and provide an accurate
thermal and mechanical model. The aim of this research is to improve the thermal and mechanical
performance—which is implemented into a 72/48 switched reluctance motor (SRM) with 75 kW—of
a low-speed direct-drive mining system (pulverizer). Thermal analysis of the SRM requires a deep
understanding of the coolant behavior and the thermal mechanism in the motor. Computational fluid
dynamics (CFD) based finite element analysis (FEA) was carried out in order to precisely visualize
and estimate fluid state and temperature distribution inside the motor. Several different coolant
configurations were carried out, with the purpose of determining an appropriate one for uniform
temperature distribution in the SRM. The natural frequencies are presented with the developed
finite element mechanical, structural model. To adapt in the mining application, the cooling
jacket configurations with 17 channels and the shaft with spoke was found to be optimal for the
SRM, which may raise the natural frequency and reduce the weight and temperature of the motor.
The simulations results showed a good agreement with experimental results regarding temperature
distribution within the motor.
Keywords: computational fluid dynamics; finite element method; mechanical analysis;
switched reluctance motor; 3D thermal model
Conclusions
A thermal and mechanical analysis of the switched reluctance motor (SRM) for mining
applications was discussed in this paper. Several case studies of water jacket configurations were
carried out to determine an appropriate method for ensuring uniform temperature distribution in the
proposed model. A 2D finite element model for the SRM was developed to obtain the losses and radial
force. The cooling jacket configurations with 17 channels at a flow rate of 0.6 L/s were found to be
optimal for a 75 kW, 72/48 SRM. The simulation results showed that the highest temperature point
was 77.5 ◦C, located inside the SRM stator winding ends. The natural frequencies were calculated
with the developed finite element mechanical, structural model. The 3D geometry of the SRM was
modeled to obtain the vibration characteristics of the motor under free vibration for modal analysis,
as well as the forced vibration response as radial forces for harmonic analysis. The structure of the
shaft with a spoke was proposed for a 72/48 SRM; the advantages of the structure caused the natural
frequency to rise and reduced the weight and temperature of the SRM prototype. The experimental
and computational fluid dynamics (CFD) results were compared and analyzed. The simulation results
were in close agreement with the experimental results and the accuracy of the simulation results was proved.
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