Local weak observability conditions of sensorless AC drives

TL;DR

This paper analyzes the conditions under which sensorless AC drives, including induction and synchronous machines, are observable, aiming to enhance observer performance in various operating scenarios.

Contribution

It provides a detailed observability analysis for induction and synchronous machines, aiding the design of more reliable sensorless control methods.

Findings

Identifies conditions affecting observability in sensorless AC drives

Helps improve observer design for better performance

Enhances understanding of sensorless drive limitations

Abstract

Alternating current (AC) electrical drive control without mechanical sensors is an active research topic. This paper studies the observability of both induction machine and synchronous machine sensorless drives. Observer-based sensorless techniques are known for their deteriorated performance in some operating conditions. An observability analysis of the machines helps understanding (and improving) the observer's behavior in the aforementioned conditions.