Analysis of magnetic levitation force of high speed PM bearingless machine

Based on the comparative study of the magnetic suspension characteristic of high speed bearingless machines and machines with magnetic bearings, this paper introduces a new structure of high speed permanent magnet (PM) bearingless machine with 2-pole integrated PM rotor covered by a magnetically conductive enclosure. The dynamic magnetic levitation force of the high speed PM bearingless machine is analyzed by means of field-circuit coupled finite element method. The simulation results show the feasibility of the proposed high speed 2-pole PM bearingless machine.