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%0 Thesis
%A von Hoegen, Anne Gisela
%T Precise and instantaneous flux-linkage sensing methods in PWM voltage-source inverters
%V 193
%I Rheinisch-Westfälische Technische Hochschule Aachen
%V Dissertation
%C Aachen
%M RWTH-2026-00400
%B Aachener Beiträge des ISEA
%P 1 Online-Ressource : Illustrationen
%D 2025
%Z Druckausgabe: 2026. - Auch veröffentlicht auf dem Publikationsserver der RWTH Aachen University
%Z Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2025
%X Precise knowledge of magnetic flux-linkage is a fundamental requirement for high-preformance control of electrical machines. Conventional estimation methods − whether based on current look-up tables or voltage integration − are prone to significant errors arising from steep PWM voltage slopes, high-frequency components, and inverter-related switching delays, particularly in SiC and GaN systems. To address these limitations, this dissertation develops and evaluates novel volt-second sensor concepts that directly measure flux-linkage by combining continuous analog voltage sensing with FPGA-based digital processing. The work introduces six new measurement architectures, including feed-forward voltage-distortion modeling for IGBT-based inverters as well as asynchronous and synchronous voltage-to-frequency converter designs. These converters translate continuous phase-voltage signals into discrete volt-second values that can be processed in real time, overcoming the accuracy and implementation constraints inherent to purely analog or purely digital approaches. A comprehensive comparative study evaluates fourteen measurement methods under varying operating points on an industrial half-bridge test bench. The analysis covers measurement accuracy, instantaneousness, and cost, and includes application-oriented validation on a traction-drive test bench. The results demonstrate that the proposed sensor concepts enable precise and instantaneous determination of flux-linkage and corresponding phase voltage, while the underlying hardware can be flexibly adapted to different control algorithms through modifications in the FPGA-based evaluation logic. Overall, the dissertation establishes a unified measurement framework that leverages complementary analog and digital technologies to overcome long-standing challenges in PWM voltage sensing. The introduced volt-second sensors provide a robust basis for enhancing control accuracy in modern electric-drive inverters and open new avenues for future research and technological advancement.
%F PUB:(DE-HGF)11 ; PUB:(DE-HGF)3
%9 Dissertation / PhD ThesisBook
%R 10.18154/RWTH-2026-00400
%U https://publications.rwth-aachen.de/record/1024898