Radial force reduction for switched reluctance motor with skewed slot structure based on FEM

Introduction Switched reluctance motors (SRMs) have several advantages (rotor simplicity, high speed operation, ease of repairing, high degree of independence between phases, short end-turn, and low inertia) and used for aerospace systems, marine propulsion systems, linear drives, mining drives, hand held tools and home utility applications. However, a major disadvantage of SRM is vibration problem. Radial force (RF) between stator and rotor of SRM is main excitation source to make a large deformation of stator laminations, which can produce intensive vibration and undesirable acoustic noise. Reduction of electromagnetic RF using skewed slot structure for SRM is rarely studied. In this paper, built nonlinear electromagnetic RF model is described and skewed slot structure of rotor is designed to reduce magnitude of electromagnetic RF and vibration.