G. Henneberger
RWTH Aachen University
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Publication
Featured researches published by G. Henneberger.
IEEE Transactions on Magnetics | 1996
I. Ramesohl; G. Henneberger; S. Kuppers; W. Hadrys
This paper deals with the procedure of calculating the vibration of a claw-pole generator. The stimulating forces of magnetic origin are calculated for several speeds. For the calculation of the displacements, the total generator system (stator plates with windings and housing) is taken into account. The displacement magnitude of the housing surface mainly causes the audible noise. The procedure makes it possible to ascertain the vibratory condition of an electrical machine just by means of the design and material data. Some results of stator vibration are presented and compared with measurements.
IEEE Transactions on Magnetics | 1996
D. Albertz; S. Dappen; G. Henneberger
This paper presents a complete FE formulation for the calculation of 3D nonlinear eddy current fields with ferromagnetic moving conductors. The formulation is realized by using the A/spl I.oarr/, V-A/spl I.oarr/ formulation in combination with the Coulomb gauge. To consider nonrectangular shapes of geometries tetrahedral elements were employed. The computation procedure is applied to an eddy current braking system of a high velocity train and the resulting braking forces are compared to measurements.
IEEE Transactions on Magnetics | 1992
G. Henneberger; Ph. K. Sattler; D. Shen
The physical and the mathematical meaning of the equivalent magnetizing current method is clarified. It is proved that the method is the same as the method of Maxwell stress for the total force, but different for local force computation. Different computational procedures are analyzed. Another procedure is proposed, which makes it possible to compute either the total or the local force with an improved accuracy. >
IEEE Transactions on Magnetics | 2004
D. van Riesen; C. Monzel; C. Kaehler; Christoph Schlensok; G. Henneberger
Implementing finite-element (FE) solvers for new formulations is often a tedious task, as many common parts are coded again and again. Also, commercial codes are often expensive and therefore difficult to include in, e.g., a teaching environment. iMOOSE is an open-source software package for FE calculations that tries to solve these issues. It is a general-purpose class library that allows for an easy implementation of new FE solvers or FE-related tools. Also included are ready-to-use solvers for electromagnetic calculations and a powerful post-processing tool. Due to its open-source nature, the source code can be examined, modified, and extended to fit the users needs.
IEEE Transactions on Magnetics | 2004
Christian Kaehler; G. Henneberger
The three-dimensional finite-element method (FEM) allows for the calculation of eddy currents in the claws of synchronous claw-pole alternators taking the rotational geometry movement into account. A transient edge-based vector formulation is utilized to compute the induced eddy-current losses in the rotor caused by the stator slotting. The theory of this formulation is outlined and the FEM model of the alternator is described. On a model built in series-production the local loss distribution on the rotor claw is discussed as well as the speed characteristics of the eddy-current losses. The use of adaptive mesh optimization leads to corrected results which are compared to local temperature measurements.
IEEE Transactions on Magnetics | 1992
G. Henneberger; Ph. K. Sattler; W. Hadrys; D. Shen
The authors describe a way to calculate the mechanical vibrations of the stator and case in the two-dimensional modeling of electrical machines. The mechanical vibrations are the result of the magnetic forces acting on the surfaces of the stator. The vibration calculation consists of three steps: (1) finite element method calculation of the magnetic field; (2) local force density calculation and its Fourier decomposition; and (3) calculation of the dynamic displacements of the electrical machines stator and case. >
Compel-the International Journal for Computation and Mathematics in Electrical and Electronic Engineering | 2006
Christoph Schlensok; D. van Riesen; T. Küest; G. Henneberger
Purpose – To present results of research closely linked to real life applications and to resume the work of a period of a few years.Design/methodology/approach – The combination of finite‐element method (FEM) and boundary‐element method is applied to simulate the electromagnetic, mechanical, and acoustic behaviour of an induction machine with squirrel‐cage rotor. The paper gives an overall view of the workflow and the implemented mathematics, starting off with the two‐dimensional, transient electromagnetic simulation and the succeeding three‐dimensional, static electromagnetic simulation. Theory and results of the mechanical and acoustic simulations are discussed.Findings – A main result of the research work is that the simulation of the acoustic behaviour of an electrical machine is very time‐consuming. Furthermore, geometry adoption, especially of the mechanical model, is very sensible.Research limitations/implications – Using the FEM for simulation of structure dynamic problems is often limited to how ...
IEEE Transactions on Magnetics | 2002
Christian Kaehler; G. Henneberger
This paper deals with the three-dimensional finite-element (FE) calculation of eddy currents in the claws of a claw-pole alternator taking the rotational geometry movement into account. For this calculation a transient edge-based A/spl I.oarr/, A/spl I.oarr/ - T/spl I.oarr/ formulation is utilized. The generation of the FE model with a special focus on the discretization of eddy-current regions and air gap is presented. The main intention lies in determining the eddy-current losses in the rotor claws in generator mode at constant speed. Since high-speed and high material conductivity leads to divergence, under-relaxation of the material conductivity in the claws is conducted.
ieee conference on electromagnetic field computation | 1991
G. Henneberger; Ph. K. Sattler; D. Shen
A method that can improve the accuracy of force calculations by the Maxwell stress method is presented. The local fields on the stress contour is obtained from the original finite element solution by subtracting the field of the discretization current sheet. Every field point has a contribution in the force calculation. The results show that this method is independent of the contour. The contour can be laid on the surface of the iron, and that allows the surface force density to be calculated. >
IEEE Transactions on Magnetics | 1997
D. Albertz; S. Dappen; G. Henneberger
This paper presents the calculation of the induced currents and forces for a 3D nonlinear eddy current field problem with ferromagnetic moving conductors. The A/spl I.oarr/, V-A/spl I.oarr/ formulation is used in combination with four different gauging methods to stabilize the solution process. To consider nonrectangular shapes of geometries tetrahedral elements were employed. The computation procedure is applied to a hybrid magnetic levitation system of a contactless and frictionless conveyance system.