05 Fakultät Informatik, Elektrotechnik und Informationstechnik

Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/6

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Institute: search.filters.UBSInstitut.Fakultätsübergreifend / Sonstige EinrichtungInstitute: search.filters.UBSInstitut.Institut für Elektrische EnergiewandlungStart date: 2020Publication Type: search.filters.UBSTyp.ZeitschriftenartikelAuthor: search.filters.author.Parspour, Nejila

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Now showing 1 - 4 of 4
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    Additively manufactured transverse flux machine components with integrated slits for loss reduction
    (2022) Kresse, Thomas; Schurr, Julian; Lanz, Maximilian; Kunert, Torsten; Schmid, Martin; Parspour, Nejila; Schneider, Gerhard; Goll, Dagmar
    Laser powder bed fusion (L-PBF) was used to produce stator half-shells of a transverse flux machine from pure iron (99.9% Fe). In order to reduce iron losses in the bulk components, radially extending slits with a nominal width of 150 and 300 µm, respectively, were integrated during manufacturing. The components were subjected to a suitable heat treatment. In addition to a microscopic examination of the slit quality, the iron losses were also measured using both a commercial and a self-developed measurement setup. The investigations showed the iron losses can be reduced by up to 49% due to the integrated slits and the heat treatment.
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    Magnetic measurements of a stator core under manufacturing influences and the impacts on the design process of a reluctance synchronous machine
    (2025) Regnet, Martin; Schmidt, Michael; Valencia Pérez, Alejandro; Löhlein, Bernd; Reinlein, Michael; Dietz, Armin; Germishuizen, Johannes; Parspour, Nejila
    The magnetic properties of electrical steel sheets, crucial for efficient electrical machine performance, deteriorate through manufacturing processes. This study investigates the impact of different manufacturing steps on magnetization behavior and specific core losses in M270-50A electrical steel, and their influence on the performance of a reluctance synchronous machine (RSM). Magnetic measurements were conducted on three material states: laser-cut strips, assembled stator cores, and press-fitted stator cores. These were integrated into finite element analysis (FEA) models, including an extended two-region stator model that separates yoke and tooth regions to reflect different manufacturing effects. Simulations examined torque characteristics and flux linkage under various loading conditions and were validated using a prototype machine. The findings of magnetic measurements indicate that manufacturing-induced stresses significantly increase magnetization demand and core losses-up to 650% and 53%, respectively. These effects lead to a 4.2% reduction in maximum air gap torque and notable changes in torque characteristic curves and d-axis flux linkage maps. Including realistic magnetic data yielded torque predictions closely aligned with experimental results and reduced discrepancy in core loss simulation by more than 50%. The study’s findings indicate that accounting for manufacturing influences in material characterization enhances modeling accuracy and enables optimized electrical machine designs and control strategies.
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    High-speed oil-cooled PMSM with novel permanent magnet shape and carbon fiber sleeved rotor for high-performance powertrain
    (2025) Clauer, Maximilian; Bauer, David; Parspour, Nejila
    For high-performance vehicles with a single-speed gearbox, maximizing the gravimetric peak power and peak torque density combined with a high maximum speed is the decisive design goal of the electric machine. A low vehicle mass leads to a high vehicle acceleration, while a high maximum rotational speed leads to a high top speed. Therefore, this work presents the design and optimization of a high-speed, oil-cooled permanent magnet synchronous machine with a novel circular sector-like permanent magnet shape and a carbon fiber sleeved rotor in combination with cobalt iron laminations. The result is a gravimetric peak power density of 50.9 kW/kg, a gravimetric peak torque density of 30.8 Nm/kg, and a maximum rotational speed of 30000 rpm. The use of two of these electric machines on one drive axle leads to a gravimetric peak axle power density of 12.1 kW/kg and a gravimetric peak axle torque density of 72.1 Nm/kg at system level, including electric machines, gearboxes and inverters.
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    Multidisciplinary design optimization of a transverse flux machine based on a multi-step loss calculation method
    (2026) Lefringhausen, Tim Jonathan; Knecht, Simon; Parspour, Nejila; Albers, Albert
    A transverse flux machines is a special type of electrical machine that offers advantages in terms of torque and power density. Due to the complex simulation, design and manufacturing, transverse flux machines are rarely used despite their many possible applications. The three-dimensional magnetic flux guidance results in a complex geometry of the stator core. As the conventional design of axially stacked electrical steel sheets is not feasible for this type of motor, new manufacturing methods are being researched. In addition, few procedures for simulation and design have been available to date. This paper presents an approach that enables the optimization of an additively manufactured stator core with respect to both efficiency and thermal behavior. In order to efficiently simulate the various power losses of the motor, the results of a 3D-FEM simulation as well as empirical models were combined in several steps. As there is a strong interaction between the thermal and electromagnetic domain for this type of motor, both were simulated iteratively coupled. The shape of the stator core was optimized for low and high speeds, taking into account the respective heating, which led to an improvement in efficiency of more than 5 %pt. in both cases.