Design and Analyses of a Coreless-Stator-Type Bearingless Motor/Generator for Clean Energy Generation and Storage Systems

This paper presents a design for a new bearingless motor/generator suitable for use in clean energy generation and storage systems. The machine is an outer-rotor type with a coreless stator. By using this type of bearingless drive in an energy generation or storage system, it is possible to obtain high efficiency, maintenance-free operation, and a long life cycle. In this paper, the rotational torque, back-emf, and suspension force are computed by the Finite Element Method (FEM). Through the analysis, a set of design parameters for the proposed machine is optimized (the rotor core thickness and the permanent magnet thickness) to meet the torque and suspension maximums