Using the Flux Increment over a Pulse-Width Modulation Period for Anisotropy-Based Self-Sensing Control

In this paper, a new residual for anisotropy-based self-sensing control (SSC) using numerical optimisation is presented. The residual is derived with an oversampled current measurement, resulting in a higher signal-to-noise ratio than a regular sampled current measurement. The sought residual provides a stable position estimate at each operating point of the permanent magnet synchronous machine (PMSM), while taking advantage of the position estimation via the quasi-direct (QD) calculation. The advantages of the QD calculation are the analytical parameterisability of the position estimation and of the speed control.