DSP utilization in radial positioning control of bearingless machine

Abstract

This work presents the radial positioning control of a bearingless machine rotor that was supported by DSP (digital signal processor). The studied bearingless machine is a three-phase induction machine that presents divided stator windings, coiled rotor and it is in the vertical position. The radial positioning control needs precision and appropriated answer time what is obtained with the DSP easily. To the machine position control is used a proportional derivative each one for each direction that indicate the rotor displacement. To the machine position control is used a proportional derivative controller (PD) that is based on two sensor measurement, each one for each direction that indicate the rotor displacement. To the current control is used a proportional integrative controller (PI) that is also implemented in DSP which acts by measured information in the windings. The machine is supplied from six inverters, which works guided, by PWM (pulse width modulation) sign from the DSP. The control machine was accomplished in a common PC initially and this work contributes with the transition to the system controlled by a DSP showing a comparison between the two implementations.