@article{CoenenHerranzGraciaHameyer, author = {Coenen, Isabel and Herranz Gracia, Mercedes and Hameyer, Kay}, title = {Influence and evaluation of non-ideal manufacturing process on the cogging torque of a permanent magnet excited synchronous machine}, series = {COMPEL-The international journal for computation and mathematics in electrical and electronic engineering}, volume = {30}, journal = {COMPEL-The international journal for computation and mathematics in electrical and electronic engineering}, number = {3}, doi = {10.1108/03321641111110843}, abstract = {Purpose - The purpose of this paper is to describe how a minimisation of cogging torque is performed with respect to the non-ideal manufacturing process, aiming at a robust design of the studied machine, focusing on magnetisation faults and the use of different qualities of the permanent magnet material. Design/methodology/approach - The applied methodology is a combination of design of experiments and finite element analysis to minimise the cogging torque of the estimated machine. Different qualities of the permanent magnet material are investigated by a stochastic analysis. Findings - A robust design of the machine is achieved, which is verified by a stochastic analysis. Furthermore, this analysis shows the strong influence of the magnet quality on the cogging torque. Practical implications - This paper provides a method for a machine design which is robust against non-ideal manufacturing and an approach to prove the use of a bad quality for a possible reduction of the fabrication costs. Originality/value - This paper gives a close insight on how to investigate non-ideal manufacturing and in particular its influence on the cogging torque.}, language = {en} } @inproceedings{SchlensokHerranzGraciaHameyer, author = {Schlensok, Christoph and Herranz Gracia, Mercedes and Hameyer, Kay}, title = {Structure-Dynamic Simulation of an Induction Maschine with Eccentrically Positioned Squirrel-Cage Rotor}, series = {XIII International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering, ISEF}, booktitle = {XIII International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering, ISEF}, language = {en} } @inproceedings{SchlensokHerranzGraciaHameyer, author = {Schlensok, Christoph and Herranz Gracia, Mercedes and Hameyer, Kay}, title = {Combined Numerical and Analytical Method for a Geometry Optimization of a PM Motor}, series = {16th International Conference on the Computation of Electromagnetic Fields, COMPUMAG}, booktitle = {16th International Conference on the Computation of Electromagnetic Fields, COMPUMAG}, language = {en} } @inproceedings{HerranzGraciaHameyer, author = {Herranz Gracia, Mercedes and Hameyer, Kay}, title = {Comparison of 2D Simulation and analytical calculation of the short-circuit behaviour of a permanent-magnet synchronous machine}, series = {XIII International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering, ISEF}, booktitle = {XIII International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering, ISEF}, language = {en} } @inproceedings{vanderGietRotheHerranzGraciaetal., author = {van der Giet, Michael and Rothe, R. and Herranz Gracia, Mercedes and Hameyer, Kay}, title = {Analysis of noise exciting magnetic force waves by means of numerical simulation and a space vector definition}, series = {XVIII International Conference on Electrical Machines, ICEM}, booktitle = {XVIII International Conference on Electrical Machines, ICEM}, language = {en} } @inproceedings{HerranzGraciaHameyer, author = {Herranz Gracia, Mercedes and Hameyer, Kay}, title = {Effect of non-sinusoidal currents on the acoustic noise excitation of induction motors}, series = {13th IGTE Symposium}, booktitle = {13th IGTE Symposium}, language = {en} } @inproceedings{HerranzGraciaHameyer, author = {Herranz Gracia, Mercedes and Hameyer, Kay}, title = {Comparision of numerical methods for the prediction of cogging torque in 2D and 3D}, series = {13th IGTE Symposium}, booktitle = {13th IGTE Symposium}, language = {en} } @article{HerranzGraciaHameyer, author = {Herranz Gracia, Mercedes and Hameyer, Kay}, title = {Influence of the magnetic anisotropy on electrical machines}, series = {Advanced Computer Techniques in Applied Electromagnetics - Studies in Applied Electromagnetics and Mechanics}, volume = {30}, journal = {Advanced Computer Techniques in Applied Electromagnetics - Studies in Applied Electromagnetics and Mechanics}, doi = {10.3233/978-1-58603-895-3-39}, pages = {39 -- 46}, abstract = {Non grain-oriented electrical steel has an inherent anisotropy, which is normally neglected in the calculation of electrical machines. Moreover, the magnetic anisotropy is usually measured in small material samples. Due to the cutting effect, the magnetic anisotropy in the machine is not the same as in the sample. In this paper, the magnetic anisotropy is considered as a global problem. A method to measure it is presented and its influence on the electromagnetic and acoustic behavior is considered through the example of an induction motor.}, language = {en} } @article{HafnerHenrotteHerranzGraciaetal., author = {Hafner, Martin and Henrotte, Francois and Herranz Gracia, Mercedes and Hameyer, Kay}, title = {An Energy-Based Harmonic Constitutive Law for Magnetic Cores With Hysteresis}, series = {IEEE Transactions on Magnetics}, volume = {44}, journal = {IEEE Transactions on Magnetics}, number = {6}, publisher = {IEEE}, doi = {10.1109/TMAG.2007.916141}, pages = {922 -- 925}, abstract = {In this paper, a phenomenological energy-based material model for ferromagnetic materials under harmonic conditions is presented. The model is based on the concept of a complex effective permeability and an accurate representation of energy is adopted as identification criteria. The material model is implemented in a time-harmonic finite element model, which allows to solve for the loss characteristics of electromagnetic devices. Identification is based on measured hysteresis loops and no additional fitting parameters are required. Hysteresis losses in a ferromagnetic C-core and a ferromagnetic torus are simulated and compared to the results obtained by means of tabulated loss characteristics.}, language = {en} }