@inproceedings{ZocherStarostGrassetal.2023, author = {Zocher, Markus and Starost, Veit and Grass, Norbert and Schmidt, Michael and Wilfling, Timo}, title = {High Bandwidth Integrator for Differential, PCB Integrated Rogowski Coils}, series = {2023 International Conference on Electrical Drives and Power Electronics (EDPE)}, booktitle = {2023 International Conference on Electrical Drives and Power Electronics (EDPE)}, publisher = {IEEE}, doi = {10.1109/EDPE58625.2023.10274019}, pages = {1 -- 8}, year = {2023}, abstract = {This paper provides an accurate and high-bandwidth current measurement method, using a differential, PCB integrated Rogowski coil. This measurement is ideal for switching characterization of wide-bandgap semiconductors, which are progressively improving switching speeds of power electronic circuits and require a PCB design with low parasitic inductance. A design workflow for system integration of a differential Rogowski coil, including the necessary signal processing circuits onto a printed circuit board is provided. Different parasitic effects have been analyzed, and an amplifier topology for high bandwidth and superior Common Mode rejection is presented. The calculations are verified by simulation and measurements.}, language = {en} } @inproceedings{SchmidtWilflingDietzetal.2023, author = {Schmidt, Michael and Wilfling, Timo and Dietz, Armin and Parspour, Nejila}, title = {An overview of design and calculation of a synchronous-reluctance machine}, series = {2023 13th International Electric Drives Production Conference (EDPC)}, booktitle = {2023 13th International Electric Drives Production Conference (EDPC)}, publisher = {IEEE}, isbn = {979-8-3503-7049-2}, doi = {10.1109/edpc60603.2023.10372169}, pages = {8}, year = {2023}, abstract = {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.}, language = {en} } @inproceedings{WilflingSchmidtDietzetal.2023, author = {Wilfling, Timo and Schmidt, Michael and Dietz, Armin and M{\"o}ckel, Andreas}, title = {Segmented exterior-rotor PMSM for increased torque density}, series = {2023 13th International Electric Drives Production Conference (EDPC)}, booktitle = {2023 13th International Electric Drives Production Conference (EDPC)}, publisher = {IEEE}, isbn = {979-8-3503-7049-2}, doi = {10.1109/edpc60603.2023.10372162}, pages = {8}, year = {2023}, abstract = {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.}, language = {en} }