Abstract
The axial gap combined motor-bearing has both rotation and axial position control capabilities. This paper reports the self-sensing technique of the axial gap displacement from the stator current waveforms. When stator winding is driven by a pulse width modulated switching amplifier, the current waveform includes a high frequency switching ripple including an axial gap information. The axial gap are estimated by demodulating this ripple using filters. Fundamental self-sensing property is examined by the theoretical analysis and simulation.
