% Encoding: UTF-8 @COMMENT{BibTeX export based on data in FAU CRIS: https://cris.fau.de/} @COMMENT{For any questions please write to cris-support@fau.de} @inproceedings{faucris.121754204, abstract = {Rotary cutting of electrical steel strip is an innovative, but largely unexplored process. By state of the art a derivation of achievable process and product quality is not sufficiently possible yet. Within this publication, a series of experiments to rotary cut toroidal core specimens will be presented. With toroidal core tests on one the hand, the rotary cutting process itself is analyzed and on the other hand the results of the sample analysis reveal the process influences. Finally, a classification of the rotary cutting process into existing processing technologies of electrical steel strip is feasible with respect to its limits and possibilities.}, author = {Hubert, Markus and Ziegler, Marco and Kutter, Simon and Schneider, Michael and Weigelt, Michael and Franke, Jörg and Hackert, Juergen and Mehlhorn, Marcus}, booktitle = {2016 6th International Electric Drives Production Conference (E/DPC)}, date = {2016-11-30/2016-12-01}, doi = {10.1109/EDPC.2016.7851339}, faupublication = {yes}, isbn = {978-1-5090-2908-2}, peerreviewed = {unknown}, title = {{Analysis} of the {Rotary} {Cutting} {Process} of {Electrical} {Steel} on {Basis} of a {Toroidal} {Core} {Test}}, venue = {Nuremberg, Germany}, year = {2016} } @inproceedings{faucris.230051441, abstract = {
In an effort to meet climate protection targets, countries around the
world are promoting electro mobility. As a result of market growth, the
worldwide production capacities for electric motors for traction drives is
going to expand significantly. Besides, the existing technology must be adapted
to automotive-specific life cycle requirements. On the product side, the
electric machine has to reach maximum power densities in order to keep the
required limitations of space and weight. Furthermore, a fully automated
production process is essential to achieve high output rates and required
quality standards. The application of new adhesives and bonding processes
implements product-relevant properties in the production of components for
electric motors. Moreover, the selection of adhesive systems and process
parameters is crucial for cost-efficient and high quality manufacturing
processes in mass production. In the production of permanent magnet synchronous
machines, adhesives are used for joining of lamination stacks, fixation of
magnets and the overall assembling of stator housings.The paper analyses and evaluates different adhesive systems in terms of
their product and process capability using two cases of application. The
results serve as a starting point for further automated process development and
reveal the challenges of the adhesive application in production technology for
electric motors.},
address = {Berlin},
author = {von Lindenfels, Johannes and Ziegler, Marco and Kneidl, Maximilian and Kühl, Alexander and Franke, Jörg},
booktitle = {Proceedings of the 9th Congress of the German Academic Association for Production Technology (WGP)},
date = {2019-09-30/2019-10-02},
doi = {10.1007/978-3-662-60417-5},
editor = {Wulfsberg, Jens P., Hintze, Wolfgang, Behrens, Bernd-Arno},
faupublication = {yes},
isbn = {978-3-662-60416-8},
keywords = {Quality; Security; Mobility},
pages = {411 - 420},
peerreviewed = {Yes},
publisher = {Springer Vieweg},
title = {{Challenges} in bonding processes in the production of electric motors},
url = {https://www.springer.com/gp/book/9783662604168#aboutBook},
venue = {Hamburg},
year = {2019}
}
@article{faucris.238255052,
abstract = {This paper covers the accurate prediction of equivalent homogenized material parameters for sheet-layered lamination stacks, which are located in rotors and stators of electric motors. Modeling the structural and dynamic behavior of these parts is a challenging task due to the special layered design of these stacks, with a huge influence of the applied joining technology, here a full-surface bonding. For the derivation of equivalent transversely isotropic material parameters, three procedures, namely the rule of mixture, an analytical and numerical homogenization, are compared eventuating in only minor differences between them. The investigations show that rather the input parameters for these averaging methods, i.e. the individual material parameters of each layer, are crucial for an accurate modeling. Experimental tests are carried out on coated sheet laminations to determine the initially unknown bonding varnish thickness with two different measurement methods, the 3D laser scanning microscopy and instrumented indentation testing, resulting in almost equivalent and reasonable values. The capability of the ab initio deduced material parameters is demonstrated by comparing an experimental and numerical modal analysis of a sample lamination stack showing an almost perfect agreement. By this, it is also revealed that a varnish Young's modulus measured by nanoindentation is overestimated from a macroscopic point of view. Damping parameters of a bonded lamination stack are determined with the help of the experimental modal analysis showing a relatively low damped system.},
author = {Baloglu, Maximilian Volkan and Ziegler, Marco and Franke, Jörg and Willner, Kai},
doi = {10.1016/j.ymssp.2020.106915},
faupublication = {yes},
journal = {Mechanical Systems and Signal Processing},
keywords = {Homogenization; Lamination stack; Laser scanning microscopy; Material modeling; Modal analysis; Nanoindentation},
note = {CRIS-Team Scopus Importer:2020-05-12},
peerreviewed = {Yes},
title = {{Determination} of equivalent transversely isotropic material parameters for sheet-layered lamination stacks},
volume = {145},
year = {2020}
}
@inproceedings{faucris.307579031,
abstract = {Climate change and its negative consequences for the environment are the greatest challenge of the current era. Electric machines are considered key both for the generation of regenerative electricity and as a substitute for fossil fuels in industry and fossil engines in the transportation sector. Resource-efficient manufacturing and operation of electric machines are therefore of high importance. The central component of every electric machine is the soft magnetic core. The manufacturing process and material selection are influencing the iron losses during operation. This paper presents a novel technology for manufacturing magnetic sheets and lamination cores for carbon dioxide efficient electric drives using an additive manufacturing approach. The potential of the technology is explained and the challenges in process development are highlighted.},
author = {Schmidt, Alexander and Ziegler, Marco and Franke, Jörg and Kühl, Alexander},
booktitle = {Lecture Notes in Mechanical Engineering},
date = {2022-10-05/2022-10-07},
doi = {10.1007/978-3-031-28839-5{\_}33},
editor = {Holger Kohl, Günther Seliger, Franz Dietrich},
faupublication = {yes},
isbn = {9783031288388},
keywords = {Additive Manufacturing; Electric Motor; Electrical Steel; Magnetic Sheets; New materials; Sustainable Manufacturing},
note = {CRIS-Team Scopus Importer:2023-07-14},
pages = {294-301},
peerreviewed = {unknown},
publisher = {Springer Science and Business Media Deutschland GmbH},
title = {{Development} of {Magnetic} {Sheets} for {CO2} {Efficient} {Electric} {Drives} {Using} an {Additive} {Manufacturing} {Approach}},
venue = {Berlin},
year = {2023}
}
@book{faucris.308021836,
author = {Schmidt, Alexander and Ziegler, Marco and Kühl, Alexander and Franke, Jörg},
doi = {10.1007/978-3-031-28839-5{\_}33},
editor = {Springer Lecture Notes in Mechanical Engineering},
faupublication = {yes},
isbn = {9783031288388},
keywords = {Magnetic Sheets; New materials; Electric Motor; Electrical Steel; Sustainable Manufacturing; Additive Manufacturing},
pages = {294-301},
peerreviewed = {Yes},
publisher = {Springer Science and Business Media Deutschland GmbH},
series = {Manufacturing Driving Circular Economy},
title = {{Development} of {Magnetic} {Sheets} for {CO2} {Efficient} {Electric} {Drives} {Using} an {Additive} {Manufacturing} {Approach}},
year = {2023}
}
@inproceedings{faucris.213347246,
author = {Mayr, Andreas and Weigelt, Michael and von Lindenfels, Johannes and Seefried, Johannes and Ziegler, Marco and Mahr, Alexander and Urban, Nikolaus and Kühl, Alexander and Hüttel, Franziska and Franke, Jörg},
booktitle = {8th International Electric Drives Production Conference (EDPC)},
date = {2018-12-04/2018-12-05},
doi = {10.1109/EDPC.2018.8658294},
faupublication = {yes},
peerreviewed = {unknown},
title = {{Electric} {Motor} {Production} 4.0 – {Application} {Potentials} of {Industry} 4.0 {Technologies} in the {Manufacturing} of {Electric} {Motors}},
url = {https://ieeexplore.ieee.org/document/8658294},
venue = {Schweinfurt},
year = {2018}
}
@inproceedings{faucris.259928663,
abstract = {The soft magnetic core is a basic component in electric motors, along with the winding and insulation systems. Soft magnetic cores are continuously magnetized and demagnetized to guide and amplify the magnetic flux. To reduce iron losses during operation, stator and rotor cores are usually made of thin laminated iron-silicon sheets insulated electrically from each other. These materials are easy to process (cutting, joining etc.), the costs are low, and the magnetic as well as the mechanical properties are adjustable during production. Due to the increasing requirements for electric motors for automotive sector, the material grades and corresponding manufacturing processes have been even optimized. For the production of Fe-Si laminations, the single sheets are stacked and joined. For this purpose, laser beam welding is increasingly used, especially in the series production of larger stators. However, the welding process affects the microstructure in the heat-affected zone and creates an electrically conductive connection between the single sheets. This increases the production-related iron losses, which have to be considered already in the design of the electric machine. As part of this research paper, the impact of laser welding of Fe-Si electrical steel sheets on the electromagnetic properties is analyzed and relationships are derived. This makes it possible to consider the production-related impact factors at an early stage.},
author = {Ziegler, Marco and Brandl, Florian and Kühl, Alexander and Franke, Jörg},
booktitle = {12th International Symposium on Advanced Topics in Electrical Engineering, ATEE 2021},
date = {2021-03-25/2021-03-27},
doi = {10.1109/ATEE52255.2021.9425168},
faupublication = {yes},
isbn = {9781665418782},
keywords = {Electric drives production; Electrical steel laminations; Iron losses; Laser welding; Soft magnetic materials},
note = {CRIS-Team Scopus Importer:2021-06-11},
peerreviewed = {unknown},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
title = {{Evaluation} of {Laser}-welded {Electrical} {Steel} {Laminations} for {Electric} {Motors}},
venue = {Bucharest},
year = {2021}
}
@inproceedings{faucris.224748717,
abstract = {Due to the rising demand for high-efficiency electric drives, the requirements for production processes are also increasing. The process steps have a significant effect on product quality and efficiency of the electric machine. In this paper, the joining processes for stator and rotor lamination stacks i. e., interlocking, laser welding, bonding and bonding varnish are compared in a holistic evaluation process. For this purpose, practical joining tests with varying process parameters on basis of a toroidal core are carried out. In this context, the process behavior and energy demand during manufacturing are evaluated. Mechanical and electromagnetic tests are used to determine the influence of the joining parameters on product quality and electromagnetic losses. The investigations were intended to support the later development of new complex processes for electric drives.},
author = {Ziegler, Marco and Biburger, Michael and Kühl, Alexander and Franke, Jörg},
booktitle = {2019 16th Conference on Electrical Machines, Drives and Power Systems, ELMA 2019 - Proceedings},
date = {2019-06-06/2019-06-08},
doi = {10.1109/ELMA.2019.8771687},
faupublication = {yes},
isbn = {9781728114132},
keywords = {Electromagnetic losses; Joining processes; Mechanical tests; Stator and rotor cores},
note = {CRIS-Team Scopus Importer:2019-08-20},
peerreviewed = {unknown},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
title = {{Influences} of joining process parameters on stator and rotor cores for electric drives},
venue = {Varna},
year = {2019}
}
@article{faucris.296102581,
abstract = {In this paper, the insulation properties of printed electrical steel laminations for high-efficiency electric machines are investigated. In contrast to conventionally produced electrical steel laminations made from rolled coil material, additive manufacturing from powder material allows extremely thin and complex near-net-shape geometries with no scrap material. At the same time, the printed electrical steel laminations offer the advantage that no additional cutting steps are required and specific material characteristics are adjustable which enables special machine modifications. To avoid global eddy current paths between the single sheet layers after the stacking process, the laminations must be insulated from each other in order to keep losses low, especially at high operating frequencies. This requires a sufficiently high surface insulation resistance on the sheets. Since the insulation coating cannot be applied continuously during rolling, as in conventional production, alternative approaches for application are required. The investigations characterize and evaluate potential insulation systems for additive manufactured laminations. The printed sheets are analyzed geometrically, electrically and metallurgically at first and characterized for the next process steps. Afterwards, potential insulation systems are analyzed and investigated in practical tests. The coating systems are characterized in terms of application, thickness, electrical and mechanical insulation properties, and options for further processing. This is crucial as the coating needs a sufficient level of adhesion to the substrate and allows successive bonding.},
author = {Ziegler, Marco and Schafer, Paul and Wieprecht, Nico and Franke, Jörg and Kühl, Alexander},
doi = {10.1109/TDEI.2023.3261821},
faupublication = {yes},
journal = {IEEE Transactions on Dielectrics and Electrical Insulation},
keywords = {Core losses; Eddy currents; Electric motors; Electrical insulation; Insulation; Lamination; Lamination; Magnetic cores; Magnetic materials; Metals; Soft magnetic materials; Steel; Three-dimensional printing},
note = {CRIS-Team Scopus Importer:2023-04-14},
pages = {1-1},
peerreviewed = {Yes},
title = {{Investigation} of {Insulation} {Layers} on {Additive} {Manufactured} {Electrical} {Steel} {Laminations} in {Electric} {Motors}},
year = {2023}
}
@inproceedings{faucris.235162179,
abstract = {Artificial intelligence entails a wide range of technologies, which provide great potential for tomorrow's electric motor production. Above all, data-driven techniques such as machine learning (ML) are increasingly moving into focus. ML provides systems the ability to automatically learn and improve from data without being explicitly programmed. However, the potential of ML has not yet been tapped by most electric motor manufacturers. Therefore, this paper aims to summarize potential applications of ML along the whole process chain. To do so, basic methods, potentials and challenges of ML are discussed first. Secondly, special characteristics of the application domain are outlined. Building on this, various ML approaches directly relating to electric motor production are presented. In addition, a selection of transferable approaches from related sectors is included, as many ML approaches can be used across industries. In conclusion, the given overview of different ML approaches helps practitioners to better assess the possibilities and limitations of ML. Moreover, it encourages the identification and exploitation of further ML use cases in electric motor production.