Suspension loss measurement and its reduction in single-drive bearingless motor

摘要

This paper presents a new estimation method of magnetic suspension loss in one degree-of-freedom (1DOF) actively positioned single-drive bearingless motors. In the 1DOF bearingless motors, only axial z-axis direction is actively positioned. The other axes, radial movements and tilting movements, are passively stabilized. Single-drive bearingless motors can generate both torque and active axial force in q- and d-axis currents, respectively, by only one three-phase inverter. In this paper, the magnetic suspension loss is estimated in experimental results. In addition, it is confirmed that the magnetic suspension loss is decreased with an adaptation of a zero power control.