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OC1: Novel Computational Methods for Machines and Devices
8:40am - 10:20am
Session Chair: Herbert De Gersem Session Chair: Adel Razek
8:40am - 9:00am
Precision finite element method simulations of a chip integrated magnetic resonance coil for in-situ MR applications
Maximilian Spiess1, André Buchau1, Jens Anders1,2
1University of Stuttgart, Institute of Smart Sensors, Stuttgart; 2Center for Integrated Quantum Science and Technology (IQST), Stuttgart/Ulm
With the latest advances in system miniaturization, magnetic resonance (MR) are gaining interest as tools for material characterization and chemical process control applications. Monolithically integrating both the receiver coil and the active MR electronics reduces the system size and cost. Moreover, the short interconnects avoid wave effects in the connecting cables, leading to a greatly increased design flexibility in the matching network. However, an integrated coil introduces several tradeoffs, which need to be understood well to still be able to achieve a good overall system performance. As shown in this paper, precision finite element electromagnetic simulations are a suitable tool to extract the planar coil’s nonidealities quantitatively and, thereby, devise suitable countermeasures to preserve the overall system performance.
9:00am - 9:20am
Iron Loss Analysis of Permanent Magnet Machines by Considering Hysteresis Loops Affected by Multi-Axial Stress
Katsumi Yamazaki1, Yoshito Sato1, Laurent Daniel2
1Chiba Institute of Technology, Japan; 2GeePs | Group of electrical engineering - Paris
This paper describes a method to calculate iron loss of permanent magnet machines that considers the hysteresis loops affected by multi-axial stress. A simple hysteresis model is introduced and modified by reluctivity and hysteresis loss increase ratios, which can be determined by core material experiments with uniaxial stress. This hysteresis model is coupled with time-stepping finite element analysis. The validity of the proposed method is confirmed by the core material experiments with multi-axial stress and measured iron loss of a permanent magnet machine. It is clarified that the accuracy of the proposed method is acceptable.
9:20am - 9:40am
Comparison of Methods to Simulate 3D Rotating Electrical Machine in AV formulation using Edge FEM
1INP Grenoble, France; 2CNRS, FRANCE; 3Altair Engineering, France
In the computational electromagnetic community, several methods have been proposed in past under the realm of edge finite element method while taking into account the rotation movement of the electrical machine in 3D. The objective of this paper is to compare the methods; such as nodal interpolation, mortar method and edge based interpolation on the basis of performance and accuracy.
9:40am - 10:00am
Model Order Reduction of Induction Motor Using Cauer Ladder Network Method
1Kyoto University, Japan; 2Kindai University; 3Science Solutions International Laboratory, Inc.; 4Kawasaki Heavy Industries, Ltd.
A method for motor model reduction is developed using the Cauer ladder network (CLN) method. The analyzed domain is decomposed into stator and moving domains that are connected through the electromagnetic field modes at the boundary. Its boundary condition is derived based on the coordinate transformation. The reduced model accurately reconstructs the induction motor property affected by the slot harmonics.
10:00am - 10:20am
A Parareal Algorithm for Time-Periodic Finite Element Method
Jiaan Sun, Lin Li
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power Univer-sity, P. R. China
A Parareal algorithm for time-periodic finite element method (P-TPFEM) is proposed, which can effectively deal with the electromagnetic field calculation problem under long-term period. P-TPFEM divides the entire calculation time into several sub-intervals and then performs calculations simultaneously in each sub-interval. Even if the accuracy requirement is reduced in solving sub-interval problem, P-TPFEM achieves the same level of precision as the standard finite element method (FEM) with short time steps. Numerical simulation results of a transformer model with fundamental frequency and a sub-synchronous oscillating voltages excitation show a higher convergence speed.