Fault tolerant switched reluctance machines with distributed inverters : modeling and control

Weiss, Claude Pascal; de Doncker, Rik W. (Thesis advisor); Hofmann, Wilfried (Thesis advisor)

Aachen : ISEA (2020, 2021)
Book, Dissertation / PhD Thesis

In: Aachener Beiträge des ISEA 145
Page(s)/Article-Nr.: 1 Online-Ressource : Illustrationen, Diagramme

Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2020

Abstract

High reliability and operations-critical applications demand fault tolerant drive systems. This thesis investigates the benefits of switched reluctance machines (SRMs) coupled with a distributed inverter (one inverter module per coil) for such applications. Three main SRM topics concerning fault tolerant operation are addressed. Firstly, a streamlined implemented pulse width modulation based direct instantaneous torque control (PWM-DITC) forms the base requirement. Secondly, a machine design methodology, to enable low torque ripple and fault tolerant control strategies, is introduced. Finally, the challenge of minimizing the unbalanced magnetic pull caused during single pole failure, which is the most common electrical fault found in SRMs, while maintaining constant torque control is addressed. Various radial force minimization controls in conjunction with PWM-DITC are proposed, implemented and validated on the test bench. The impact of each control on torque, radial force, unbalanced magnetic pull and current loading is investigated.