5-DOF Controlled Self-Bearing Motor

A novel 5-DOF actively controlled self-bearing motor that combines the functions of a motor, two radial AMBs, and an axial AMB has been developed to achieve smaller size and higher performance simultaneously. In this paper, radial control performance of the developed self-bearing motor is evaluated by static and dynamic experiments. The radial control force and the negative stiffness due to the permanent magnets are measured statically. The dynamic performance was tested by measuring the impulse response and the frequency response and the maximum oscillation amplitude of the suspended rotor during rotation. The developed 5-DOF self-bearing motor displays sufficient radial position controllability.