Principle of Generation and Measurement of Bearing Force of a Five-Axis Active Suspended Axial-Flux Self-Bearing Permanent Magnet Motor Using Plus and Minus Two-Pole Magnetic Field

Abstract

　The axial-flux self-bearing permanent magnet motor combines a disk motor and magnetic bearings that can generate rotational torque and perform five-axis active suspension. The radial force and tilt torque are generated by superimposing the magnetic fields with plus two and minus two poles on the number of rotor poles. In this paper, the forces and torques acting on the rotor are derived from a simple magnetic field analysis and their characteristics are shown. The analysis results are verified by measuring the forces and torques of a prototype motor using a six-axis force sensor. The results show that the proposed method can generate the bearing's forces.