Vector control of an induction type axial gap combined motor-bearing

This paper introduces a vector control of an induction type axial gap combined motor-bearing. The induction type motor has merits of large axial force and high capability for an axial gap control due to its flat magnetic property of the rotor. However it is difficult to control the axial force and the rotating torque independently. To solve this problem, newly developed vector control is applied to the induction type motor. The axial force and the motoring torque are analyzed theoretically and the independent control for them is developed. In order to confirm the proposed technique, a motor has been made and tested. The theoretical analysis and experimental results confirm that the rotor is controlled stably by the proposed vector control and the rotating torque and the axial force can be controlled independently.