Investigation of Circulating Currentsin Delta Connected PMSM - A Combined Analytical and Numerical Approach ConsideringRotor Design

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dc.contributor.authorTydén, Gustav
dc.contributor.authorCallerfjord, Emil
dc.contributor.departmentChalmers tekniska högskola / Institutionen för elektrotekniksv
dc.contributor.examinerThiringer, Torbjörn
dc.contributor.supervisorAndersson, Rasmus
dc.contributor.supervisorHuang, Zhe
dc.date.accessioned2024-06-14T06:22:21Z
dc.date.available2024-06-14T06:22:21Z
dc.date.issued2024
dc.date.submitted
dc.description.abstractAbstract Triplen harmonics are a key concern in delta connected machines, primarily because they lead to circulating currents which decreases the efficiency of the machine. This thesis presents a comprehensive analysis, employing both analytical and numerical methods, to enhance the understanding of triplen harmonic generation in relation to rotor design. Specifically, the study focuses on a delta connected double-layer interior permanent magnet synchronous machine (DIPMSM), where the phenomena of circulating currents is analyzed as a consequence of the triplen harmonics in the generated flux linkage. In the study, eight rotor parameters are thoroughly investigated individually, in pairs and through interconnected influence on the circulating currents. The parametric research was conducted numerically in Ansys Maxwell. It is concluded that the arc angles and the inner extension spacing length are the most significant parameters with respect to the third harmonic current amplitude. Furthermore, the study identifies the iron core saturation as having the greatest impact on the amplitude of the circulating currents. This is found due to the reason of the specific third harmonic enhancement with increasing levels of saturation. Spectral analysis is employed to break down current harmonic components in the delta loop, leading to the construction of an optimization strategy for minimizing circulating current based on rotor parameters. The optimal rotor design reduced the third harmonic by 95.5% in no-load conditions and 5.7% in maximum load condition, highlighting that the saturation effect inducing the third harmonic cannot be eliminated by optimal rotor parametric alignment.
dc.identifier.coursecodeEENX30
dc.identifier.urihttp://hdl.handle.net/20.500.12380/307846
dc.language.isoeng
dc.setspec.uppsokTechnology
dc.subjectKeywords: Circulating currents, triplen harmonics, delta connected PMSM
dc.titleInvestigation of Circulating Currentsin Delta Connected PMSM - A Combined Analytical and Numerical Approach ConsideringRotor Design
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster's Thesisen
dc.type.uppsokH
local.programmeElectric power engineering (MPEPO), MSc
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