Signal-Injection Sensorless Control of Synchronous Reluctance Machines for Overload Operation
Anantaram Varatharajan, Gianmario Pellegrino, Eric Armando
Abstract
Signal-injection sensorless control for low speeds region are usually assisted with compensation techniques to support the heavy load operations beyond rated conditions. For the standard <inline-formula><tex-math notation="LaTeX">$d$</tex-math></inline-formula>-axis pulsating voltage injection, this article analyzes the prospect of using <inline-formula><tex-math notation="LaTeX">$q$</tex-math></inline-formula>-axis current-model flux instead of the <inline-formula><tex-math notation="LaTeX">$q$</tex-math></inline-formula>-axis current for decoupled position estimation. Through convergence analysis, the feasibility of operation at overload is evaluated for the decoupled scheme against the state-of-art compensation technique and is shown to be a promising candidate for its simplicity and the lack of <i>preprocessing</i> of flux-map. All claims are experimentally validated on a 1.1 kW synchronous reluctance machine test-bench.