Analytical Modeling of Magnetic Field Considering the Saturation in Switched Reluctance Motor
Keywords:
Analytical modeling, magnetic field, saturation and switched reluctance motorAbstract
This paper aims at accurately predicting the severe magnetic saturation of a switched reluctance motor (SRM). Firstly, Method I based on the solution of the Laplacian or Poissonian field equation is used to predict the magnetic field in the air gap, but this method is only applicable to the mildly saturated magnetic field. Secondly, Method II based on the winding function theory (WFT) considering the saturation is utilized to predict the magnetic field, which can precisely compute the severely saturated magnetic field. Nevertheless, the tangential magnetic flux density is not considered by Method II. Finally, the synthetic method based on the advantages of Method I and Method II is proposed, which can predict the air-gap magnetic field in SRM having any number of stator slots and rotor poles for any rotor positions. The results indicate that the error of the air-gap magnetic field obtained by the synthetic method is within 5%. Moreover, the radial electromagnetic force and torque obtained by the Maxwell Stress equation are compared with the results computed by the FEM, verifying the effectiveness of the synthetic method. It lays the groundwork for the optimization of torque ripple, vibration and noise of SRM.
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References
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