@misc{MoehlenkampNadebohrStolz, author = {M{\"o}hlenkamp, Georg and Nadebohr, Andre and Stolz, Kateryna}, title = {Simulation und Vergleich zweier Betriebsarten des Antriebssystems f{\"u}r HELMS-Lokomotiven}, series = {ETR : Eisenbahntechnische Rundschau}, journal = {ETR : Eisenbahntechnische Rundschau}, number = {9}, issn = {0013-2845}, pages = {66 -- 68}, language = {de} } @misc{YangMoehlenkamp, author = {Yang, Yinghui and M{\"o}hlenkamp, Georg}, title = {Short Circuit Behavior of Dual Three-phase Permanent Magnet Synchronous Motors with Different Mutual Inductance in Electric Propulsion Application}, series = {24th European Conference on Power Electronics and Applications (EPE'22 ECCE Europe), 5-9 Sept. 2022, Hanover, Germany}, journal = {24th European Conference on Power Electronics and Applications (EPE'22 ECCE Europe), 5-9 Sept. 2022, Hanover, Germany}, publisher = {IEEE}, address = {Piscataway, NJ}, isbn = {978-1-6654-8700-9}, pages = {1 -- 10}, abstract = {The dual three-phase permanent magnet synchronous motors (DTP-PMSMs) are suitable in aircraft electric propulsion unit (EPU) application because of their good reliability and fault-tolerant capability. However, this fault-tolerant capability can get weakened or even eliminated in short circuit fault due to the influence of flux coupling between the two isolated three-phase sub-systems. In this paper, a mathematical model of DTP-PMSMs with different mutual inductance between the two sub-systems is developed and analyzed. Based on the model, different short circuit protection methods are discussed and compared. Finally, a simulation of an EPU consisting of a DTP-PMSM, and a simplified constant speed propeller (CSP), is implemented to verify the short circuit behaviors.}, language = {en} } @misc{YangMoehlenkamp, author = {Yang, Yinghui and M{\"o}hlenkamp, Georg}, title = {Sizing and parameter study of compressor case-mounted permanent magnet synchronous motor for hybrid electrical compressor integration}, series = {Conference Paper}, volume = {2024}, journal = {Conference Paper}, editor = {Deutsche Gesellschaft f. Luft u. Raumfahrt, DGLR}, publisher = {Deutsche Gesellschaft f{\"u}r Luft- und Raumfahrt - Lilienthal-Oberth e.V}, address = {Bonn}, doi = {10.25967/630085}, url = {http://nbn-resolving.de/urn:nbn:de:101:1-2411061312377.659630030958}, pages = {1 -- 8}, abstract = {This paper discusses the sizing and parameter estimation of a case-mounted permanent magnet synchronous motor designed for integration into a counter-rotating hybrid electrical compressor. The motor features a toroidal winding stator and a sinusoidal Halbach array permanent magnet rotor. The structure of the motor is modeled as several 2D hollow cylindrical layers for analysis and simulation. The motor model is developed with a focus on estimating parameters such as motor mass, power, and efficiency. Based on this model, a motor design algorithm is created to generate a motor design map. Serving as part of a multidisciplinary design approach, the electrical motor design map is generated as a look-up table for interfacing with other design disciplines, such as aerodynamic design, mechanical design, and propulsion system design. Therefore, motor design parameters are selected with particular emphasis on geometry and mechanical performance. The full factorial experimental method is applied to create the design map. Finally, comparative studies are conducted using the controlled variable method to analyze typical relationships between motor geometry, mass, power, efficiency, and design parameters.}, language = {en} } @misc{MoehlenkampBaig, author = {M{\"o}hlenkamp, Georg and Baig, Faryal}, title = {Electrical model validation of magnetic cores for current sensing and loop filter applications}, series = {2024 International Symposium on Electromagnetic Compatibility - EMC Europe}, volume = {2024}, journal = {2024 International Symposium on Electromagnetic Compatibility - EMC Europe}, publisher = {IEEE}, doi = {10.1109/EMCEurope59828.2024.10722481}, pages = {6}, language = {en} } @misc{Moehlenkamp, author = {M{\"o}hlenkamp, Georg}, title = {Comparative analysis of various magnetic cores for current sensing in active EMI filters}, series = {2024 International Symposium on Electromagnetic Compatibility - EMC Europe}, volume = {2024}, journal = {2024 International Symposium on Electromagnetic Compatibility - EMC Europe}, publisher = {IEEE}, doi = {10.1109/EMCEurope59828.2024.10722356}, pages = {1 -- 6}, language = {en} } @misc{MoehlenkampYang, author = {M{\"o}hlenkamp, Georg and Yang, Yinghui}, title = {Analytical model for magnetic field distribution and electromagnetic characteristics analysis of permanent magnet synchronous motor with toroidal winding stator and sinusoidal Halbach array rotor}, series = {13th International Conference on Power Electronics, Machines and Drives (PEMD 2024)}, volume = {2024}, journal = {13th International Conference on Power Electronics, Machines and Drives (PEMD 2024)}, publisher = {IET}, address = {Stevenage}, doi = {10.1049/icp.2024.2159}, pages = {1 -- 8}, abstract = {This paper presents an analytical model for the rapid examination of the magnetic field distribution and electromagnetic characteristics of a Permanent Magnet Synchronous Motor (PMSM) featuring a toroidal winding stator (TWS) and a sinusoidal Halbach array rotor (SHAR). The analytical model for magnetic field distribution is established by solving the governing Laplace's and Poisson's equations of the vector magnetic potential. The no-load magnetic field distribution from SHAR and the magnetic field induced from the armature reaction are individually analyzed. According to superposition theory, the complete magnetic field distribution is derived. Furthermore, an analytical model for motor electromagnetic characteristics, including motor inductances, electromagnetic torque, and motor on-load induced voltage, is formulated. Lastly, the precision of the analytical model is verified through finite element analysis (FEA) simulations across various operational points.}, language = {en} } @techreport{KrautzMoehlenkampSakkasetal., author = {Krautz, Hans Joachim and M{\"o}hlenkamp, Georg and Sakkas, Nikolaos Panagiotis and Gillung, Frank and Lenivova, Veronika}, title = {Verbundvorhaben AEL3D - Neuartige por{\"o}se 3D-Elektrodenmaterialen zur effizienteren alkalischen Wasserelektrolyse; Teilprojekt: Zellbau und Systemtests : fachlicher Abschlussbericht : Projektlaufzeit: 01.09.2016-31.12.2021}, publisher = {KWT Lehrstuhl Kraftwerkstechnik, BTU Brandenburgische Technische Universit{\"a}t Cottbus-Senftenberg}, address = {Cottbus}, doi = {10.2314/KXP:1859085385}, pages = {147}, language = {de} } @techreport{KrautzMoehlenkampKatzeretal., author = {Krautz, Hans Joachim and M{\"o}hlenkamp, Georg and Katzer, Christian and Klatt, Matthias}, title = {Konzepte und Betriebsstrategien f{\"u}r lastflexible Feuerungs- und Dampfsysteme : Abschlussbericht : Laufzeit des Vorhabens: 01.09.2016 bis 31.12.2021}, publisher = {btu Brandenburgische Technische Universit{\"a}t Cottbus-Senftenberg}, address = {Cottbus}, doi = {10.2314/KXP:1861122357}, pages = {223}, language = {de} } @misc{StolzMoehlenkampNikodinoski, author = {Stolz, Kateryna and M{\"o}hlenkamp, Georg and Nikodinoski, Mirko}, title = {Dimensionierung eines Multi-Energiespeichers}, series = {Netzpraxis : Magazin f{\"u}r zukunftsf{\"a}hige Stromnetze, Planung, Bau, Betrieb, Service}, volume = {64}, journal = {Netzpraxis : Magazin f{\"u}r zukunftsf{\"a}hige Stromnetze, Planung, Bau, Betrieb, Service}, number = {7-8}, publisher = {VDE Verlag GmbH}, address = {Berlin}, issn = {1611-0412}, pages = {52 -- 57}, abstract = {Batterie-und Wasserstoff-Speicherkraftwerke sind in vielen Ver{\"o}ffentlichungen und energiepolitischen Dokumenten des Gesetzgebers als vorrangige emissionsfreie Erg{\"a}nzung zur steigenden volatilen Einspeisung aus erneuerbaren Energien (EE) beschrieben. Allerdings sind ihre wichtigen technischen Auslegungsparameter wie installierte Leistung und Kapazit{\"a}t daraus nicht ableitbar. An dieser aktuellen Problematik wird im Energie-Innovationszentrum (EIZ) an der BTU Cottbus-Senftenberg geforscht. Ein EIZ-Multi-Speicherkraftwerk soll die Gr{\"o}ße eines konventionellen Kraftwerkblocks von bis zu 600 MW haben und eine Batterie-Kurzzeit- sowie einen H2 -Langzeitspeicher umfassen.}, language = {de} } @misc{YangHenkeMoehlenkamp, author = {Yang, Yinghui and Henke, Markus and M{\"o}hlenkamp, Georg}, title = {Analytical investigation of short-circuit protection and post-fault operation in dual three-phase PMSMs for hybrid electric counter-rotating compressor applications}, series = {IEEE access}, volume = {14}, journal = {IEEE access}, publisher = {IEEE}, address = {Piscataway, NJ}, issn = {2169-3536}, doi = {10.1109/ACCESS.2026.3658195}, pages = {17303 -- 17323}, abstract = {The hybrid electric counter-rotating compressor (CRC) has the potential to improve power-specific fuel consumption in aircraft engines. However, due to its cascaded structure, a reduction or loss of driving power in a single compressor stage can significantly degrade the overall compressor performance. A short-circuit fault is a typical electrical failure in an electric motor that can lead to a complete loss of driving power. One innovative post-fault operation strategy is to utilize the braking capability of the failed motor at low speed to lock its corresponding compressor stage. In this way, the failed stage can function as a stator stage, still providing degraded flow-guiding capability and preventing reverse rotation. This article investigates the short-circuit protection strategy and post-fault operation of dual three-phase permanent magnet synchronous motors (DTP-PMSMs) for hybrid electric CRC applications. Analytical models are developed to characterize the post-fault behavior of the DTP-PMSM. Key design factors are defined, and their influence on post-fault performance is analyzed. Critical post-fault operating points are identified to evaluate and compare different protection strategies. Based on these results, an optimized short-circuit protection strategy is proposed for DTP-PMSMs in CRC applications. Finally, the analytical findings and the proposed strategy are validated through simulation.}, language = {en} }