Rotation Angle Estimation of Single Type Axial-flux Self-bearing Motor

Abstract

This paper introduces the rotation angle estimation of a single stator type axial-flux self-bearing motor supported by passive magnetic bearings. Because the damping force of passive magnetic bearings is quite small, the rotational vibration may occasionally diverge. To solve this problem, a sensorless vector control is effective. In this paper, the back electromotive force is estimated from the stator voltage and the voltage drop of the resistance of the stator coil. The experimental results show that the rotation angle can be estimated by the proposed method.