Modeling and Control of Salient-Pole Permanent Magnet Axial-Gap Self-Bearing Motor

This paper will introduce an inset-type axial-gap self-bearing motor (AGBM), which is an electrical combination of an axial thrust-bearing and an axial flux motor. A method for controlling the axial position and the rotating speed of the AGBM without the influence of reluctance torque is also discussed. First, the axial force and the motoring torque are analyzed theoretically, and then, the control method is derived. To demonstrate the proposed technique, an inset two-pole AGBM has been constructed and tested. The experimental results confirm that the motor works stably with the proposed vector control. Moreover, the rotating torque and the axial force can be controlled independently as well.