بحث بعنوان Thermal and Mechanical Analysis of a 72/48 Switched Reluctance Motor for Low-Speed Direct-Drive Mining Applications

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: [email protected]; Tel.: +86-138-8962-6136
  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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