Analytical Model for Evaluating Unbalanced Electromagnetic Forces in Switched Reluctance Hub Motors under Air-Gap Eccentricity 2024-01-2203

Owing to its remarkable simplicity, high torque density, and expansive speed range, the switched reluctance motor (SRM) garners significant attention in the automotive industry, particularly in propelling electric vehicles. Nevertheless, the most prominent challenge faced by SRMs in their role as hub motors for electric vehicles is the unbalanced radial electromagnetic forces resulting from air gap eccentricity, which will induce motor vibration and noise, even seriously jeopardizing the driving safety of electric vehicles. Building upon the foundation of a nonlinear model for the SRM, this paper presents an analytical approach to assess the unbalanced radial forces arising from both radial and tilt air gap eccentricities. Furthermore, a test platform is constructed to validate the effectiveness of the proposed method, and comparative analyses of experiments, finite element simulations, and numerical analytical results are provided. These investigations have provided valuable information and references for future research on the unbalanced radial forces of electric motors under dynamic eccentricity and established the groundwork for enhancing the switched reluctance motor's overall performance, stability, and safety within the hub motor system.