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1

Multi-harmonic approach to determine load dependent local flux variations in power transformer cores

Riemer B., Hameyer K.

Archives of Electrical Engineering

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2015

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Vol. 64, nr 1

129--138

EN

This paper presents a methodology for the calculation of the flux distribution in power transformer cores considering nonlinear material, with reduced computational effort. The calculation is based on a weak coupled multi-harmonic approach. The methodology can be applied to 2D and 3D Finite Element models. The decrease of the computational effort for the proposed approach is >90% compared to a time-stepping method at comparable accuracy. Furthermore, the approach offers a possibility for parallelisation to reduce the overall simulation time. The speed up of the parallelised simulations is nearly linear. The methodology is applied to a single-phase and a three-phase power transformer. Exemplary, the flux distribution for a capacitive load case is determined and the differences in the flux distribution obtained by a 2D and 3D FE model are pointed out. Deviations are significant, due to the fact, that the 2D FE model underestimates the stray fluxes. It is shown, that a 3D FE model of the transformer is required, if the nonlinearity of the core material has to be taken into account.

2

Design considerations of a linear generator for a range extender application

Seo U., Riemer B., Appunn A., Hameyer K.

Archives of Electrical Engineering

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2015

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Vol. 64, nr 4

581--592

EN

The free piston linear generator is a new range extender concept for the application in a full electric vehicle. The free piston engine driven linear generators can achieve high efficiency at part and full load which is suitable for the range extender application. This paper presents requirements for designing a linear generator deduced from a basic analysis of a free piston linear generator.

3

Active suspension system with integrated electrical tubular linear motor: design, control strategy and validation

Thul A., Eggers D., Riemer B., Hameyer K.

Archives of Electrical Engineering

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2015

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Vol. 64, nr 4

605--616

EN

This paper focuses on the design and control of an active suspension system, where a tubular linear motor is integrated into a spring damper system of a vehicle. The spring takes up the weight of the vehicle. Therefore the electric linear motor can be designed very compact as it has to provide forces to adjust the damping characteristic only. Design and construction of the active suspension system, a control strategy and validation measurements at a test bench are presented.

4

Investigation of the skull melting method for the generation of particulate material of inorganic compounds

Riemer B., Lange E., Hameyer K.

Archives of Electrical Engineering

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2011

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Vol. 60, nr 2

197-209

EN

This paper describes the application of the skull melting method for an artificial generation of particulate material of inorganic compounds like CsOH, NaOH, SnO2 and UO2. The skull melting process is analyzed analytically. Thereby the electromagnetic field is calculated by a one dimensional time harmonic model. Thermal losses are estimated by simple analytical formulas. Finally an electromagnetic thermal field coupling is performed to calculate the temperature distribution inside the crucible, considering transient thermal effects. The skull melting process is simulated for the example of UO2. Under consideration of the given material properties it is shown that the skull melting method can be applied to fuse UO2.