Abstract
Circulating currents are a major issue in permanent magnet BLDC electric motors with delta connected windings. In 3-phase machinery they are driven by harmonics whose order is equal to a multiple of the number of phases. The harmonics occur because of special slot/pole combinations, rotor and stator asymmetries, phase imbalances and magnetic saturation inside the teeth and the yoke. In this publication all of these aspects are investigated. The advantages of delta compared to wye connection are also pointed out in terms of mass production. External sources of circulating currents like inverter operation are not part of this publication.
Zusammenfassung
Kreisströme sind ein ernstzunehmendes Problem im Bereich der permanenterregten BLDC-Motoren mit Dreieckschaltung. In 3-phasigen Motoren werden solche Ströme von Harmonischen erzeugt. Die Ordnungszahlen sind gleich einem Vielfachen der Anzahl der Stränge. Diese Harmonischen werden meist aufgrund von speziellen Nut/Pol-Kombinationen, durch Asymmetrien von Rotor und Stator, Phasen-Asymmetrie und magnetische Sättigung im Joch oder in den Zähnen hervorgerufen. In dieser Publikation sollen die aufgezählten Ursachen im Detail analysiert werden. Zusätzlich werden die Vorteile der Dreieckschaltung gegenüber Sternschaltung der Spulengruppen in der Massenfertigung diskutiert. Äußere Ursachen, wie z. B. vom Umrichter hervorgerufene Kreisströme, werden in dieser Publikation nicht behandelt.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Streiter, R. (2008): Active preview suspension system – ABC Prescan in the F700. ATZ worldwide eMagazines, 110.
Dajaku, G., Gerling, D. (2009): Skewing effect on the PM flux-linkage high harmonics of the PM machines with delta winding. In 13th European conference on power electronics and applications, EPE ’09, 2009 Sept. (pp. 1–7).
Nipp, E. (1998): Examinations of torque interruptions and circulating currents in PM synchronous motors with switched stator windings. In Proceedings of international conference on electrical machines, ICEM ’98 (pp. 334–339).
Dogan, H., Wurtz, F., Foggia, A., Garbuio, L. (2011): Performance analysis and comparison of three IPMSM with high homopolar inductance for electric vehicle applications. In Proceedings of the 2011-14th European conference on power electronics and applications, EPE 2011, 2011 Aug. (pp. 1–10).
Müller, G., Vogt, K., Ponick, B. (2008): Berechnung elektrischer Maschinen. 6th ed. Berechnung elektrischer Maschinen (Vol. 2). New York: Wiley-VCH.
Dinca, C., Bushe, M., Giedymin, A., Schafer, U. (2014): Mass producible optimized BLDC motor for automotive dynamic pump applications. In International conference on electrical machines, ICEM, 2014 Sept. (pp. 1286–1292).
Krupp, T. (2014): Power core M330-35A datasheet. September. Online available: http://www.thyssenkrupp.com/documents/Publikationen/Techforum/techforum_1_09_de.pdf.
Müller, G., Ponick, B. (2009): Theorie Elektrischer Maschinen. 6th ed. Elektrische Maschinen. New York: Wiley-VCH.
Gkountaras, A., Dinca, C., Giedymin, A., Birgel, P., Schaefer, U., Dieckerhoff, S. (2014): Low cost integrated motor-controller drive for an electrical active suspension system. In 16th European conference on power electronics and applications, EPE’14-ECCE Europe, 2014 Aug. (pp. 1–10).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Dinca, C., Schäfer, U. Circulating currents of delta connected fractional slot machines for mass production. Elektrotech. Inftech. 132, 68–74 (2015). https://doi.org/10.1007/s00502-015-0281-x
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00502-015-0281-x