Design and Analysis of Stator-Inset-PM Bearingless Slice Motor Utilizing DC Suspension Excitation

This article proposes a stator-inset-permanent magnet (PM) bearingless slice motor, which is capable of producing a constant directional force with direct suspension current regardless of the rotor’s angular position. The motor allows for flexible combinations of stator tooth and PM/rotor pole pair combinations, providing enhanced torque/force capability. Initially, the motor topology and operational principle are introduced. The magnetomotive force and permeance model is developed to calculate the air-gap flux density analytically, taking into account both the PM and suspension excitation. Subsequently, the finite-element method is utilized to comparatively examine the torque capability and suspension force quality. Finally, a prototype is manufactured to validate the analysis.