Five-Degree-of-Freedom Active-Suspended Axial Gap Self-Bearing PMSM with Double Inner Stator

An axial gap self-bearing permanent magnet synchronous motor (PMSM) controls axial force by the d-axis magnetic field, while radial force and tilting torque are regulated by the plus two-pole or minus two-pole magnetic field. The use of two stators enables the active control of the six-axis force and torque, as well as the realization of contactless suspension and rotation without the involvement of passive magnetic bearings. This paper presents a novel outer rotor structure, specifically designed for pump applications. The structure, control system, and the results of the levitation and rotation tests conducted on the proposed motor are shown.