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    <publishedDate>2020-11-02</publishedDate>
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    <title language="eng">Development of a Two In One Motor System as a new Vehicle Energy Concept for Next Generation Car</title>
    <parentTitle language="eng">2020 Fifteenth International Conference on Ecological Vehicles and Renewable Energies (EVER)</parentTitle>
    <identifier type="doi">10.1109/ever48776.2020.9243148</identifier>
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    <author>Michael Schier</author>
    <author>Fabius Epple</author>
    <author>Aicha Maaoui</author>
    <author>Martin Schwellinger</author>
    <author>Michael Weber</author>
    <author>Armin Dietz</author>
    <author>Rolf Zimmermann</author>
    <subject>
      <language>deu</language>
      <type>uncontrolled</type>
      <value>Air conditioning;Electric potential;Biological system modeling;Production;Automobiles;Next generation networking;Engines</value>
    </subject>
    <collection role="institutes" number="">Fakultät für Elektrotechnik Feinwerktechnik Informationstechnik</collection>
    <collection role="institutes" number="">Institut für leistungselektronische Systeme ELSYS</collection>
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    <title language="eng">Design of a Wide Input Voltage Range Current-Fed DC/DC Converter Within a Reduced Duty-Cycle Range</title>
    <abstract language="deu">A design of a current-fed push-pull converter for wide input voltage ranges within a reduced duty-cycle range is presented. Based on the converter conversion ratios of three different clamping configurations, the potential of the input clamping is shown analytical, simulative and by measurements. A differentiation is made between the four possible operating modes, which can be distinguished in the control of the semiconductors and the magnetomotive force in the reactor. By optimizing the turn ratios of both transformers, the wide input voltage range capability of the input clamped current-fed push-pull converter was improved, which has been proved by measurements on a real prototype.</abstract>
    <parentTitle language="eng">2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)</parentTitle>
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    <author>Michael Gerstner</author>
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      <value>DC power supply ;  Design ;  Converter circuit ; Measurement ; Power Supply</value>
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    <collection role="institutes" number="">Fakultät für Elektrotechnik Feinwerktechnik Informationstechnik</collection>
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    <title language="eng">Reinforcement Learning Control of Six-Phase Permanent Magnet Synchronous Machines</title>
    <abstract language="eng">Control of multi-phase machines is a challenging topic due to the high number of controlled variables. Conventional control methods, such as field-oriented control (FOC), address this issue by introducing more control loops. This, however, increases the controller design complexity, while the tuning process can become cumbersome. To tackle the above, this paper proposes a deep deterministic policy gradient algorithm based controller that fulfills all the control objectives in one computational stage. More specifically, the proposed approach aims to learn a suitable current control policy for six-phase permanent magnet synchronous machines to simplify the commissioning of the drive system. In doing so, physical limitations of the drive system can be accounted for, while the compensation of imbalances between the two three-phase subsystems is rendered possible. After validating the training results in a controller-in-the-loop environment, test bench measurements are provided to demonstrate the effectiveness of the proposed controller. As shown, favorable steady-state and dynamic performance is achieved that is comparable to that of FOC. Therefore, as indicated by the presented results, reinforcement learning-based control approaches for multi-phase machines is a promising research area.</abstract>
    <parentTitle language="eng">2023 13th International Electric Drives Production Conference (EDPC)</parentTitle>
    <identifier type="doi">10.1109/edpc60603.2023.10372153</identifier>
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    <author>Lara Broghammer</author>
    <author>Dennis Hufnagel</author>
    <author>Tobias Schindler</author>
    <author>Michael Hoerner</author>
    <author>Petros Karamanakos</author>
    <author>Armin Dietz</author>
    <author>Ralph Kennel</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Multi-phase machines</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>current control</value>
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    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>permanent magnet synchronous machine (PMSM)</value>
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    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>power electronics</value>
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    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>deep reinforcement learning</value>
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    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>deep deterministic policy gradient (DDPG)</value>
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    <collection role="institutes" number="">Fakultät für Elektrotechnik Feinwerktechnik Informationstechnik</collection>
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    <title language="eng">Review-based Selection Recommendation for Galvanically Isolated DC/DC Converters Designed For a Wide Input Voltage Range</title>
    <abstract language="deu">Depending on the application range, there are various recommendations in the literature which converter topology should be used. These are mostly based on experience or more or less deeper considerations. For DC/DC converters, which are operated over a wide input voltage range, such recommendations rarely exist. Therefore, this contribution shows the evolution of two input voltage dependent selection matrices, which should facilitate the selection of future topologies based on known publications and basic considerations. The focus here lies on converters for λ = V i_max /V i_min ≥ 3 with galvanic isolation. First, the data set is introduced, where a distinction is made between flyback converters, forward converters and other 1stage or 2stage converters before the evolution of the novel input voltage dependent matrices is carried out. These two matrices support the selection of a suitable topology and whether the energy transfer should be done by one or two stages.</abstract>
    <parentTitle language="eng">2021 IEEE 19th International Power Electronics and Motion Control Conference (PEMC)</parentTitle>
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    <author>Michael Gerstner</author>
    <author>Martin Maerz</author>
    <author>Armin Dietz</author>
    <collection role="institutes" number="">Fakultät für Elektrotechnik Feinwerktechnik Informationstechnik</collection>
    <collection role="institutes" number="">Institut für leistungselektronische Systeme ELSYS</collection>
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    <title language="eng">An overview of design and calculation of a synchronous-reluctance machine</title>
    <abstract language="eng">Because of the absence of rare earth magnets, the reluctance synchronous machine has a more favourable sustainability balance compared to the permanent magnet synchronous machine with NdFeB magnets. Additional advantages include the absence of copper in the rotor and the ease of manufacture of the non modified rotor. A clear disadvantage of the reluctance synchronous machine is the relatively high torque ripple if no measures such as skewing are taken. Therefore, the machine is mainly used in applications such as fans where the torque ripple is not critical for the operation. The paper makes a contribution to addressing the problem of torque pulsation. For the reduction of torque harmonics, the usage of various rotor designs as well as asymmetric rotor geometry are presented. In addition, the aspect of torque harmonics, which is predicted by the finite element analysis is discussed and possibilities of torque ripple reduction for further investigations are shown. The description of a reluctance network of the machine is addressed with a semi-analytical approach for this purpose. Finally, the results of the preliminary calculation are validated by finite element analysis (FEA) and the quantities are verified with measurements on a device under test. The deviations between the methods are shown and discussed.</abstract>
    <parentTitle language="eng">2023 13th International Electric Drives Production Conference (EDPC)</parentTitle>
    <identifier type="doi">10.1109/edpc60603.2023.10372169</identifier>
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    <author>Michael Schmidt</author>
    <author>Timo Wilfling</author>
    <author>Armin Dietz</author>
    <author>Nejila Parspour</author>
    <subject>
      <language>eng</language>
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      <value>reluctance synchronous machine</value>
    </subject>
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      <language>eng</language>
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      <value>semianalytical</value>
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    <subject>
      <language>eng</language>
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      <value>reluctance network</value>
    </subject>
    <subject>
      <language>eng</language>
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      <value>torque ripple reduction</value>
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    <subject>
      <language>eng</language>
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      <value>asymmetric rotor geometry</value>
    </subject>
    <collection role="institutes" number="">Fakultät für Elektrotechnik Feinwerktechnik Informationstechnik</collection>
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    <title language="eng">Reconfigurable Transformer for Wide Input Voltage Range DC/DC Converters</title>
    <abstract language="deu">A transformer with variable primary windings for wide input voltage range DC/DC converters is presented. This transformer structure allows three states of the primary winding to be converted by only two individual windings. Based on the evaluations of a two-switch flyback converter, the potential of DC/DC converters with variable structures, the implementation of such a transformer and the advantages and disadvantages are shown and discussed. Real measurement results demonstrate the noticeable increase in efficiency and the reduction in component stress, having a positive influence on the operation of the converter and the component selection during the design process.</abstract>
    <parentTitle language="eng">2020 IEEE 9th International Power Electronics and Motion Control Conference (IPEMC2020-ECCE Asia)</parentTitle>
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    <author>Michael Gerstner</author>
    <author>Martin Maerz</author>
    <author>Armin Dietz</author>
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      <language>deu</language>
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      <value>DC/DC converter ;  efficiency ;  tapped transformer ; wide input voltage range</value>
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    <collection role="institutes" number="">Fakultät für Elektrotechnik Feinwerktechnik Informationstechnik</collection>
    <collection role="institutes" number="">Institut für leistungselektronische Systeme ELSYS</collection>
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    <title language="eng">Variable Switching Point Predictive Current Control for Multi-Phase Permanent Magnet Synchronous Drives</title>
    <abstract language="deu">Finite control set model predictive control (FCS-MPC) is a promising method for the control of multi-phase machines, due to its capability to directly account for nonlinearities and multiple controlled variables. To overcome the drawback of high current ripples and excitation of harmonic currents in the so-called xy-subsystem, several methods have been proposed in the literature so far. This paper proposes an MPC-based method that achieves high granularity of switching by not only switching at the discrete time steps, but also within the sampling interval. In doing so, the discussed algorithm, referred to as variable switching point current control (VSP 2 CC), produces low current distortions, while still keeping the advantages of conventional FCS-MPC, such as fast dynamic behavior during transients. To highlight the above, VSP 2 CC is applied to a six-phase permanent magnet synchronous machine (PMSM) and compared with conventional FCS-MPC and MPC that employs virtual voltage vectors (VV-MPC).</abstract>
    <parentTitle language="eng">2021 IEEE International Conference on Predictive Control of Electrical Drives and Power Electronics (PRECEDE)</parentTitle>
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    <author>Michael Hoerner</author>
    <author>Sebastian Wendel</author>
    <author>Armin Dietz</author>
    <author>Petros Karamanakos</author>
    <author>Ralph Kennel</author>
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      <value>Model predictive control, FCS-MPC, VSP2CC, VV-MPC, multi-phase, PMS</value>
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    <collection role="institutes" number="">Institut für leistungselektronische Systeme ELSYS</collection>
    <collection role="Forschungsschwerpunkt" number="1">Energie &amp; Ressourcen</collection>
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    <title language="eng">Segmented exterior-rotor PMSM for increased torque density</title>
    <abstract language="eng">Embedded permanent magnets are widely used for electrical machines with interior-rotor. This provides better protection of the magnets and enables the use of an additional reluctance torque for torque density improvements. For external rotors, the use of surface-mounted permanent magnets is common. The following paper analyses the application of inserted magnets at exterior-rotors with segmentation to achieve an increase in torque density.High pole electrical machines are often designed with a fractional-slot concentrated winding which leads to field harmonics. Therefore, an analytical method for qualitative comparison of different winding configurations for using reluctance torque with consideration of stator field harmonics is applied. Besides rotor saliency, the magnetic flux concentration is a positive effect of interior permanent magnets. Here, the flux leakage along mechanical necessary iron bridges is crucial. With the segmented rotor geometry, these iron bridges can be avoided for interior placed magnets. This allows a flux concentration for electrical machines with a high number of pole-pairs. The paper presents a simplified geometry-based approach to describe these improvements. The method is validated with a finite element analysis (FEA) and a prototype with a segmented rotor is built.</abstract>
    <parentTitle language="eng">2023 13th International Electric Drives Production Conference (EDPC)</parentTitle>
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    <author>Timo Wilfling</author>
    <author>Michael Schmidt</author>
    <author>Armin Dietz</author>
    <author>Andreas Möckel</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>PMSM</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>V-PMSM</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>IPM</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>exterior-rotor</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>segmented rotor</value>
    </subject>
    <collection role="institutes" number="">Fakultät für Elektrotechnik Feinwerktechnik Informationstechnik</collection>
    <collection role="institutes" number="">Institut für leistungselektronische Systeme ELSYS</collection>
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