|09:00 - 9:30||Welcome Coffee and Registration|
|10:00 - 10:30|
|10:30 - 11:00|
|11:00 - 11:30||
David Morisco, Ioan Liviu lepure, Bosch.
Nowadays an impressive effort is done to significantly reduce the calculation time and improve the performance of electromagnetic calculation of rotating electrical machines. With increasing availability of high performance computing and the acute interest for detailed electromagnetic evaluation, the simple 2D based approaches may have come to their limits. A comprehensive understanding and modelling of electromagnetic mechanism is required to accurately evaluate the performance of an electrical machine. Therefore, in this paper the end-winding stray field is analyzed and the additional iron losses in the end region of the stator core are presented and assessed. For this purpose, enhanced 3D finite element models, including the complex end-winding geometry, are computed on a parallel distributed high performance computing system. To emphasize the benefit of this enhanced 3-D finite element modelling, two different study case examples are shown.
|11:30 - 12:00||
Impact of different cutting and packaging technologies on the motor performance as well as comparison to FEM simulation, Florian Herget, Thyssenkrupp.
High efficiency of electrical motors used in industry as well as in electrical cars is getting increasingly important. New directives for industrial drives require novel motor designs with higher efficiency and new efficient motors for traction drives are developed to improve the range of electrical cars. The development time for new motors is a very important aspect for being competitive in today’s market. Therefore, the quality of FEM simulations, as well as prototyping, are very important to achieve the specifications accurately. However, FEM simulations use material properties measured under optimal conditions without any cutting effects. Furthermore, the production processes of prototypes differ from those of the series production. In order to investigate the differences, four motors with different fabrication methods were built and measured for comparison of the production influences in the final application. Additionally, FEM simulations of the motors with material data taken from laser cut and stamped samples were performed.
|12:00 - 13:30|
|13:30 - 14:00||
|14:00 - 14:30||
6 kW Axial Flux Motor based on Soft Magnetic Composites for Hand held power tools, Cristofaro Pompermaier, Husqvarna Group.
The supremacy of radial flux motors is ubiquitous and there are several reasons for that. As most of motors are made from thin laminations, radial motors are the natural choice due to the simplicity and performance. A study has been performed with the help of JMAG and its 3D capabilities to evaluate an Axial Flux Motor (AFM) made of Soft Magnetic Composites (SMC). The motor consists of 12 slots, 14 poles with a rated output power of 6 kW. Husqvarna Construction division has a motor named Prime which is used in several products like Drill Machine, Power Cutter, Wall Saw among others. The efficiency, weight and reliability are crucial for these professional tools. Power dense motors are achieved by usage of external cooling fluid as water and internal cooling as oil for heat transfer/distribution. The analysis and results are fully automated by scripts in Microsoft Excel, SolidWorks and JMAG. The proposed AFM should provide the desired performance with a simple and intuitive assembly process. The mechanical design has been made in CATIA and prototypes are under evaluation.
|14:30 - 15:00||
As heavy rare earth elements occur less than one-tenth as often in ore deposits as light rare earth elements. Future usage needs to be reduced in light of the resource risks and costs. As such, a method was developed to recover reductions in coercive force and prevent demagnetization temperature from reducing without adding any heavy rare earth elements.
First, a heavy rare-earth-free magnet was developed by hot deformation, which limits growth of crystal grain size, and relationships were clarified between coercive force and optimal deforming temperatures, speed, and total rare earth amounts for heavy rare-earth-free magnets.
|15:30 - 16:00|
|16:00 - 16:30||
Parameter Studies of Synchronous Reluctance Machines, Sascha Neusüs, Technische Universität Darmstadt.
After a short introduction in the basics of synchronous reluctance machine design, the implementation of a straightforward flux barrier design method in JMAG is explained step by step. The design method needs only a few variables, which are varied in a parameter study. Due to saturation effects, the inductances in d- and q-axis of the synchronous reluctance machine are not constant and the adjustment of an operating point needs some simulations to get the inductance map by the variation of the d- and q-currents. The combination of finite-element studies with the basic equations of synchronous reluctance machines leads to a more time-efficient method to find these operating points, which are used to compare different rotor designs. In addition to the electromagnetic design of the synchronous reluctance machine, the mechanical design is also focused, since mechanical ribs are needed to stabilize the rotor structure. At the end, an efficiency map is calculated in JMAG with the operating points of the IEC 60034-2-3 and compared with the measured efficiency map obtained by this method.
|16:30 - 17:00||Last words|