Modellbildung und Analyse von Kraftanregungen in permanentmagneterregten elektrischen Maschinen unter Berücksichtigung von Fertigungseinflüssen

• Modelling and analysis of force excitations in permanent magnet excited electrical machines under consideration of manufacturing influences

Schröder, Michael; Hameyer, Kay (Thesis advisor); Schmülling, Benedikt (Thesis advisor)

Düren : Shaker (2020)
Book, Dissertation / PhD Thesis

In: Aachener Schriftenreihe zur Elektromagnetischen Energiewandlung 38
Page(s)/Article-Nr.: xvii, 186 Seiten : Illustrationen, Diagramme

Dissertation, RWTH Aachen University, 2020

Abstract

Deviations inevitably occur in the manufacturing process of electrical machines. As with all manufacturing processes, only a finite manufacturing accuracy is practically achievable, so that each manufactured component exhibits a deviation from its ideal properties. In multi-stage manufacturing processes, these deviations of the individual components can accumulate. For design and manufacturing of an electrical machine, the components are tolerated suitable, whereas for the electromagnetic design, ideal material properties, dimensions and geometric symmetries are assumed. Various tools are used in the design and calculation of electrical machines. The use of precise simulation models is intended to reduce development times and costs and to keep the costs for the construction of prototype machines low. The mostly computer-aided product development process combines various development tools from different areas. The methodical linking of all tools to an iterative design process helps to determine all characteristic parameters of an electric drive system in the shortest possible development cycle. The tools used differ. They can be differentiated according to criteria such as required computing time or time effort, analytical or numerical approaches or possible information gain, respectively cause analysis. All methods have in common that the selection of an analysis tool is usually accompanied by a restriction of the scope of application, so that different methods can be preferred in the individual phases of a design process. In the acoustic evaluation of a drive system design, the detailed harmonic behavior of a machine cannot be considered in the initial, usually analytical design. Apart from the fundamental knowledge of possible occurring force and torque harmonics from excitation tables. Also the effects of manufacturing influences cannot usually be determined and evaluated at this design stage. In a subsequent or final finite element simulation, the influences can be modelled and determined much more precisely. However, an analysis and allocation of the harmonic behavior is then only indirectly possible, so that no conclusions can be drawn about the causes of individual field harmonics. The focus of this dissertation is the design of an efficient calculation method for determining the air gap flux density distribution in electrical machines under the influence of manufacturing deviations and the resulting electromagnetic forces. Using a time-efficient and largely analytical calculation method, the additional forces caused by the deviations are determined and characterized over the entire operating range of the electrical machine. Results can be considered effect separated over the entire harmonic spectrum. The application of the developed methodology is carried out using permanent magnet excited synchronous machines. Individual influences can be selectively taken into account, resulting in a tool of scalable detail depth, which can be used efficiently in all stages of the design and calculation process of electrical machines.

Institutions

• Chair of Electromagnetic Energy Conversion [614410]