Refine
Document Type
Has Fulltext
- no (9)
Reviewed
Keywords
- Gebäudemodernisierung (1)
- Holzbau (1)
- Holztafelbau (1)
- IPM (1)
- PLCopen (1)
- PMSM (1)
- V-PMSM (1)
- Vorfertigung (1)
- asymmetric rotor geometry (1)
- digitalization (1)
Institute
- Fakultät für Elektrotechnik Feinwerktechnik Informationstechnik (5)
- Institut für leistungselektronische Systeme ELSYS (3)
- Fakultät Maschinenbau und Versorgungstechnik (2)
- Fakultät Angewandte Mathematik, Physik und Allgemeinwissenschaften (1)
- Fakultät Architektur (1)
- Lehr- und Kompetenzentwicklung (1)
- Nuremberg Campus of Technology (1)
In laboratory practicals (labs), students actively investigate technical and scientific phenomena and thus experience autonomy, competence, and social embedding, factors that promote motivation. However, labs mostly rely on highly structured and instructive concepts and often require costly equipment. Therefore, the research question in this paper is: How can learner-centered teaching methods and learning formats be improved by rethinking the digitization of lab practicals?
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.
The concept of the digital twin (DT), which accompanies a plant or machine throughout its entire life cycle, has further reinforced the role of Virtual Commissioning (VC). Of decisive importance for the economically and technically sensible use of the DT is its creation as early as possible in the life cycle. In the field of mechanical engineering, therefore, the first digital artifacts of the DT should ideally already be created in parallel with the mechanical design phase. The first step is the kinematization of the CAD model. This paper presents a new method for the semi-automated kinematization of 3D CAD models. The method uses a verbal description of the motion sequence desired by the designer, based on DIN EN 60848 (GRAFCET) [2] and using elements from VDI Guideline 2860 (handling functions) [8]. The presented method is easy to use and self-describing to a large extent. It enables designers to define in their own domain, in parallel to their mechanical designs, the desired motion sequence of the machine they have designed in machine-readable form. The actual kinematization of the CAD model is performed automatically. At the end, the kinematized design is available in COLLADA format and can be imported via the import interfaces of common simulation tools and can therefore be used for the DT.
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.
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.
A shorter product life cycle and therefore, reduced
project duration is the major success factor for machinery and
plant engineering today. One use case for Virtual Commission-
ing (VC) is the early software test without an existing plant.
The primary effort of VC lies in the manual creation of the
plant model. There are various simulation tools with different
advantages available. Selecting one tool has consequences for
the whole engineering process. The exchange of models across
different tools is not possible or discouraged by the respective
vendors due to various reasons. This paper describes a concept to
exchange behavior models via the table-based import interfaces
for an automated model generation within common simulation
tools. The concept utilizes an approach to exchange the behavior
of components using the vendor-neutral and standardized pro-
gramming language PLCopenXML containing all IEC 61131-3
programming languages. This removes the main obstacle for a
broader industrial application of VC, as it minimizes the manual
effort for creating and exchanging behavior models through the
use of standardized library elements and existing interfaces.
The new seminar "Digital Twins for Virtual Commissioning of Production Machines" follows a technical approach that uses virtualization and offers the possibility to pursue an uncommon teaching method called problem-based learning (PBL). The seminar is divided into two parts, with fundamental theoretical knowledge in automation technology and systems modeling provided first. In the second part, the students use the dedicated software environment to edit projects on their own, and at this point the PBL approach is used. This method enables students to self-organize their learning process and take an active part in the seminar. The idea for the seminar and virtual teaching lab evolved from the industrial use case of testing software for programmable logic controllers (PLCs) without the real machine, using virtual commissioning (VC). The primary effort of VC lies in the manual creation of a digital representation of each mechatronic component providing the same behavior seen from PLC perspective. Students are taught to do this, create the so-called digital twin (DT).
Holztafelbau
(2025)
Die Publikation ist ein Handbuch zur Anwendung des modernen Holztafelbaus mit Ausführungen zu Entwurf, Konstruktion, Verfertigung, Überwachung und Montage, Tragsysteme, Bauphysik, Schallschutz, Brandschutz und Raumluft. Es enthält Ausführungen zur Technischen Gebäudeausrüstung im Holzbau, Regelkonstruktionen, Regeldetails, Bauprodukten und zur Gebäudemodernisierung mit vorgefertigten Holztafelbauelementen.
