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Your search keyword '"Muetze, Annette"' showing total 242 results
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242 results on '"Muetze, Annette"'

1. Thermal Finite Element Modeling and Simulation of a Squirrel-Cage Induction Machine

Author

Bergfried, Christian, Späck-Leigsnering, Yvonne, Seebacher, Roland, Eickhoff, Heinrich, and Muetze, Annette

Subjects
Computer Science - Computational Engineering, Finance, and Science
Abstract

Finite element models of electrical machines allow insights in electrothermal stresses which endanger the insulation system of the machine. This paper presents a thermal finite element model of a 3.7 kW squirrel-cage induction machine. The model resolves the conductors and the surrounding insulation materials in the stator slots. A set of transient thermal scenarios is defined and measured in the machine laboratory. These data are used to assess the finite element model.

Published
2023

2. Multi-objective free-form shape optimization of a synchronous reluctance machine

Author

Gangl, Peter, Köthe, Stefan, Mellak, Christiane, Cesarano, Alessio, and Mütze, Annette

Subjects
Computer Science - Computational Engineering, Finance, and Science, Mathematics - Optimization and Control
Abstract

This paper deals with the design optimization of a synchronous reluctance machine to be used in an X-ray tube, where the goal is to maximize the torque, by means of gradient-based free-form shape optimization. The presented approach is based on the mathematical concept of shape derivatives and allows to obtain new motor designs without the need to introduce a geometric parametrization. We validate our results by comparing them to a parametric geometry optimization in JMAG by means of a stochastic optimization algorithm. While the obtained designs are of similar shape, the computational time used by the gradient-based algorithm is in the order of minutes, compared to several hours taken by the stochastic optimization algorithm. Finally, we show an extension of the free-form shape optimization algorithm to the case of multiple objective functions and illustrate a way to obtain an approximate Pareto front., Comment: 6 pages, 7 figures, proceedings to IGTE Symposium Graz 2020

Published
2020

25. Analysis of different stator winding topologies for fractional horse power brushless direct current motors.

Author

Krall, Felix and Muetze, Annette

Subjects
*FRACTIONAL powers, *BRUSHLESS electric motors, *STATORS, *VARIABLE speed drives, *ELECTRIC drives, *LUXURY cars
Abstract

The number of auxiliary electric drives can exceed 100 for luxury cars. Due to their ever‐increasing prevalence, the electromagnetic emissions (EME) of these drives are becoming increasingly important. This work explores the influence of four different stator winding topologies on the electromagnetic emissions and the efficiency performance of fractional horsepower (FHP) brushless direct current (BLDC) drives. Two monofilar windings with a wire diameter of 0.15 and 0.27 mm, an untwisted bifilar winding, and a twisted bifilar winding are inspected. The parasitic stator to winding coupling capacitance is the motor's main source for common mode currents and thus, for radiated emissions. A three‐media capacitance model is introduced to allow estimating this coupling path in the design phase of the motor. Twisting the phases of a bifilar winding reduces the excitation of this path. Therefore, the radiated emissions are reduced by 5 dBμV/m ${\mathrm{B}}_{\mu \text{V/m}}$. The stator winding topology also affects the winding resistance and thus the efficiency. The monofilar winding with a wire diameter of 0.27 mm shows the lowest level of consumed power, followed by the monofilar winding with a wire diameter of 0.15 mm, the untwisted bifilar winding and the twisted bifilar winding. [ABSTRACT FROM AUTHOR]

Published
2022
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