Fault-Tolerant Control of a Flux-switching Permanent Magnet Synchronous MachineFinal Thesis Summary of Thesis
Author of thesis: Ing. Mustafa Osman Elrayah Aboelhassan, Ph.D.
Acad. year: 2013/2014
Supervisor: prof. Ing. Jiří Skalický, CSc.Abstract:
It has become clear that the most successful design approach involves a multiple phase drive in which each phase may be regarded as a single-module. The operation of any one module must have minimal impact upon the others, so that in the event of that module failing the others can continue to operate unaffected. The modular approach requires that there should be minimal electrical, magnetic and thermal interaction between phases of the drive. Flux-Switching permanent magnet synchronous machines (FS-PMSM) have recently emerged as an attractive machine type virtue of their high torque densities, simple and robust rotor structure and the fact that permanent magnets and coils are both located on the stator.
Flux-switching permanent magnet (FS-PMSM) synchronous machines are a relatively new topology of stator PM brushless machine. They exhibit attractive merits including the large torque capability and high torque (power) density, essentially sinusoidal back-EMF waveforms, as well as having a compact and robust structure due to both the location of magnets and armature windings in the stator instead of the rotor as those in the conventional rotor-PM machines. The comparative results between a FS-PMSM and a traditional surface-mounted PM (SPM) motor having the same specifications reveal that FS-PMSM exhibits larger air-gap flux density, higher torque per copper loss, but also a higher torque ripple due to cogging -torque. However, for solely permanent magnets excited machines, it is a traditional contradiction between the requests of high torque capability under the base-speed (constant torque region) and wide speed operation above the base speed (constant power region) especially for hybrid vehicle applications.
A novel fault-tolerant FS-PMSM drive topology is presented, which is able to operate during open- and short-circuit winding and converter faults. The scheme is based on a dual winding motor supplied from two separate vector-controlled voltage-sourced inverter drives. The windings are arranged in a way so as to form two independent and isolated sets. Simulation and experimental work will detail the driver’s performance during both healthy- and faulty- scenarios including short-circuit faults and will show the drive robustness to operate in these conditions.
The work has been published in ten conference papers, two journal papers and a book chapter, presenting both the topology of the drive and the applied control schemes, as well as analysing the fault-tolerant capabilities of the drive.
Aerospace, High speed, Redundancy, Fault-Tolerant, AC motor drives , Fault-Tolerant machines, Dual three-phase machines, Flux-Switching permanent magnet synchronous machine (FS-PMSM), Multi-phase motors, Multi-phase drives, Vector-control, Field-oriented vector-control, Pulse-width modulation (PWM), Voltage source inverter (VSI), Permanent magnet synchronous machine (PMSM), Servomotor, Nonlinear-control, Feedback-control, Position control, Speed control, Current control, Backlash, Field-weakening control, Normal-operating condition (Healthy), Faulty-operating condition (Unhealthy), Open-circuit fault, Short-circuit fault, Single-phase fault, Balance three-phase fault, Braking torque, Safety-critical application.
Date of defence
Result of the defence
Defended (thesis was successfully defended)
Language of thesis
Power Electrical and Electronic Engineering (PK-SEE)
Composition of Committee
doc. Dr. Ing. Miroslav Patočka (předseda)
prof. RNDr. Vladimír Aubrecht, CSc. (člen)
doc. Ing. Čestmír Ondrůšek, CSc. (člen)
doc. Ing. Ondřej Vítek, Ph.D. (člen)
doc. Ing. Petr Toman, Ph.D. (člen)
Ing. Petr Modlitba, CSc. (člen)
doc. Ing. Vladislav Singule, CSc. - oponent (člen)
doc. Ing. Bohumil Skala, Ph.D. - oponent (člen)
prof. Ing. Jiří Skalický, CSc.
doc. Ing. Vladislav Singule, CSc.
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doc. Ing. Bohumil Skala, Ph.D.
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