Signal-Injection Sensorless Control of Synchronous Reluctance Machines for Overload Operation

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 standardd-axis pulsating voltage injection, this article analyzes the prospect of usingq-axis current-model flux instead of theq-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 ofpreprocessingof flux-map. All claims are experimentally validated on a 1. 1 kW synchronous reluctance machine test-bench.