Application of Star-Point Voltage Exploiting Sensorless Techniques to Low-Power PMSMs

Abstract

In the field of sensorless control of Permanent Magnet Synchronous Motors (PMSMs), different techniques based on machine anisotropies have been developed. This work analyzes sensorless techniques that exploit the star-point voltage of PMSMs at the aim of evaluating the applicability of such techniques by analyzing the machine inductances matrix. After a brief mathematical description of the technique, a characterization of the machine anisotropy information extracted from the star-point voltage has been performed. Finally, experimental results conducted on a custom PMSM are presented in order to validate the proposed theory.