Conference Agenda

Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).

Session Overview
OC1: Novel Computational Methods for Machines and Devices
Thursday, 18/Jul/2019:
8:40am - 10:20am

Session Chair: Herbert De Gersem
Session Chair: Adel Razek
Location: Auditorium

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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

Anirudh Singh Chauhan1,3, Pauline Ferrouillat3, Brahim Ramdane1, Yves Maréchal1, Gerard Meunier2

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

Tetsuji Matsuo1, Kengo Sugahar2, Akihisa Kameari3, Yuji Shindo4

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.

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