Permanentmagneterregte Mehrphasen-Synchronmaschine in Zahnspulenausführung einschließlich des phasendezimierten Betriebs

Translated title of the contribution: Permanent Magnet Multiphase Synchronous Machine with Fractional Slot Concentrated Winding including Post-Fault Field Orientated Control Strategy

Rudolf Krall

Research output: ThesisDoctoral Thesis

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Nowadays, the importance of smart electrical drives is growing. The demand for drives of higher reliability is of major importance. This can be achieved by increasing the number of phases of an electrical machine. Permanent magnet synchronous machines (PMSM) with a short pitched fractional slot winding (teeth winding) allow the construction of a compact machine design with increased efficiency. The aim of this work is to study permanent magnet synchronous machines (PMSM) with short pitched fractional slot windings (teeth winding) with phases numbers of 3 and above. An analytical mathematical method to evaluate the most important characteristic parameters of PMSM with phase number m and equipped with a teeth winding is shown. The proposed method is applied on different slot/pol/phase combinations. A universal interconnectable stator winding PMSM with teeth winding is designed. The stator coils can be connected in several ways in order to evaluate different variants. The stator coils can be interconnected to a 3-phase single layer or 3-phase double layer winding architecture. Further on, it is possible to connect the coils to a 6-phase double layer arrangement. Additionally, the 6-phase system can be split into two 3-phase systems where the two systems can be with or without a spatial phase shift to each other. The characteristic parameters for each winding connection are evaluated by experiments subsequently. Differences between the measured and calculated results are discussed. The dq reference frame transformation is proposed for all possible winding connections of the prototype machine. A post fault field orientated operation strategy for the 6-phase case is developed. Therefore, the reference frame transformation matrices are developed for each possible failure scenario separately. The potential of the 6-phase machine to generate continuous torque even under failure modes has been proven for a very and less critical failure mode.
Translated title of the contributionPermanent Magnet Multiphase Synchronous Machine with Fractional Slot Concentrated Winding including Post-Fault Field Orientated Control Strategy
Original languageGerman
  • Weiß, Helmut, Assessor A (internal)
  • Schrödl, Manfred, Assessor B (external), External person
Publication statusPublished - 2015

Bibliographical note

embargoed until null


  • permanent magnet synchronous machine
  • multiphase
  • fractional slot concentrated winding
  • single layer winding
  • double layer winding
  • winding function
  • analytical model
  • 3-phase machine
  • 6-phase machine
  • 6-phase dual-stator machine
  • field orientated control
  • post-fault field orientated control strategy

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