Structural Design and Optimization Analysis of Multi-degree-of-freedom Motor Using Gas Bearing

Abstract

Gas bearings are becoming more and more widely used in motors, with low coefficients of friction compared to previous mechanical bearings, optimized motor performance. For this article, a novel motor structure based on a conventional air-floating multi-degree-of-freedom (MDOF) permanent magnet motor is proposed. The structure combines a MDOF motor with a gas bearing. The motor model proposed in this paper uses a spherical rotor shell, a hemispherical stator and a tile-shaped permanent magnet. The electromagnetic characteristics of the novel air-floating permanent magnet spherical motor (APMSM) with different permanent magnet (PM) structures and different magnetization methods are mainly studied, and the air gap magnetic field, slot torque, self-turn torque and deflection torque of the APMSM are analyzed. Then, the permanent magnet thickness and the groove fit were optimized, and the groove torque was compared by finite element software. Finally, the experimental results show that the electromagnetic properties of APMSM are significantly improved.