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Loss Comparison of Small Delta- and Star-Connected Permanent Magnet Synchronous Machines [in press]

Rehm, Felix; Breining, Patrick; Decker, Simon; Kolb, Johannes; Hiller, Marc

Abstract:
Delta-connected stator windings are often used in mass production of small Permanent Magnet Synchronous Machines (PMSMs). In comparison to star-connected stator windings, a delta-connected winding system offers advantages for manufacturing and lowers production costs. A main disadvantage of motors with such a winding system are additional losses caused by the Zero-Sequence Current Component (ZSCC). In this paper the ZSCC and its impact on the generated losses in a delta-connected PMSM used as a traction motor for a pedal electric cycle (Pedelec) is analysed. The calculated results are compared to those of a star-connected PMSM with the same design. We will show that the amplitude of the ZSCC depends on the operating point of the machine. As a result, the copper losses in the delta-connected machine are up to 5.8 % higher than the ones in the star-connected machine. On the other hand, the iron losses are 1 % smaller in the delta-connected machine. The efficiency of the delta-connected machine is still up to 4 % smaller.

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Postprint §
DOI: 10.5445/IR/1000104861
Veröffentlicht am 14.01.2020
Originalveröffentlichung
DOI: 10.1109/IECON.2019.8927165
Coverbild
Zugehörige Institution(en) am KIT Elektrotechnisches Institut (ETI)
Publikationstyp Proceedingsbeitrag
Jahr 2019
Sprache Englisch
Identifikator ISBN: 978-1-72814-878-6
KITopen-ID: 1000104861
Erschienen in IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society
Veranstaltung 45th Annual Conference of the Industrial Electronics Society (IECON 2019), Lissabon, Portugal, 14.10.2019 – 17.10.2019
Verlag IEEE, Piscataway, NJ
Seiten 1171–1176
Schlagworte delta connection, zero-sequence current component, loss comparison, pedal electric cycle
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