The design technologies of the large capacity rotating machines have been developed by progress of the analysis oriented R&D, due to difficulty of trial manufacture. The electrical properties have been analyzed by not only using the numerical electromagnetic field calculation but also using the cooperation with concentrated magnetic circuit model, dq-axis equation and so on. In the presentation, the present analysis technologies will be introduced with consideration of historical and technical features of the large capacity machines.

Electromagnetic CAE process that requires a number of trials by changing design parameters such as sensitivity analysis, data fitting, and design optimization, spends mostly on the series of unessential tasks for design engineers. It contains changing geometry parameters, mesh generation, building analysis model and so on. These should be automated without human intervention to improve CAE process for design engineers. In this session, the automated procedure of electromagnetic CAE will be introduced by showing several application example to describe the merits of CAE process automation. Furthermore, modeFRONTIER also has various post-processing functionsthat support decision making for design engineers. The availability of this functions and effectiveness will be also described.

The giant magnetostrictive material is electromechanical transformation one with large magnetpstriction and electro-mechanical coupling factor. We developed the actuator by it; Giant Magnetostrictive Actuator. This paper describes the magnetic field analysis on the actuator by using the finaite element method.

The main purpose of this work is to develop a simulation technique to predict the deflection after the induction resistance heating process, and to utilize it to choose an appropriate process condition before manufacturing. In our simulation model, transient heat generation by ohmic heating and induction heating are calculated using Abaqus with coarse FE mesh and JMAG with fine FE mesh, respectively. Then obtained total heat is used as an input to simulate mechanical response on Abaqus again. Our numerical results, such as temperature histories and residual deflections, show good agreement with the measurements. In addition, the dual- frequency induction heating process is examined numerically.

The giant magnetostrictive material(GMM) has some characteristics of very large strain of more than 1000 ppm, high energy density, and high responsibility. So it is expected to be used for fine positioning device or braking system, and so on. Micro actuator using this equipped with iron yoke and winding coil, therefore, has advantages over PZT type, in simple low voltage driving, high robustness and wide temperature operation range. This paper describes the performance of some divided elements improved the loss of eddy current for applied high frequency voltage to the GMM. The eddy current problem occurred in high frequency driving will be reduced with the size. Quantitative analysis of high frequency dynamic power loss in GMM is calculated by finite element method. Especially divided element counts are depend on skin effect. The calculated results based on the theory shows theeffect of dividing the element of GMM.

As the magnetic field analysis CAE is widely used, the purpose and application of CAE become more diversified. Fortunately, I had opportunities to hear from our users about the use of CAE for their products, and also their history of using CAE. In this presentation, I will introduce the services we provide along with the CAE experience of our users. I hope to assist you in your approach to CAE and your vision for the future products.

The calculation speed is the key factor in addressing large-scale electromagnetic field problems. This presentation will discuss the results of speeding up JMAG’s solver by SMP parallel calculation and the enhancement of algorithms using specific examples.
The current attempts to develop a faster solver will also be presented.

Currently, computational environments on which electromagnetic field analyses are performed move to parallel computers based on multi-core processors. I discuss whether these multi-core processors have possibility of accelerating the electromagnetic field analysis. Furthermore, in the context of FEM analyses, I introduce some new techniques for fast linear solvers. The examples of the electromagnetic field analyses using a multigrid method and IDR(s) method are shown. Finally, I give a brief comment on further acceleration of electromagnetic field analysis in future.

Efficient utilization of emerging multicore systems remains one of the most challenging questions in several decades. In this talk, I present a brief architectural description of several multicore systems followed by a detailed JMAG scalability analysis on them. Some benchmark results of up-to-date and upcoming multicore systems are also included.

With the increased trend for the miniaturization of DC/DC converters, small transformers are commonly required as they directly affect the product form. To make a transformer smaller and thinner, it is essential to reduce the size of the core. However, errors in the shape of the ferrite cores that occur in the course of processing cause their properties to vary from one another. The uniform, stable properties for the ferrite cores can be achieved by estimating the inductance based on the dispersion of the core measurements, and reducing it. In this study, a transformer with the excitation winding near the gap was used to investigate the dispersion in inductance, taking into the account the current distribution in the winding, which is caused by leakage flux.

High-frequency switching transformers, since they are compact and capable of handling greater capacity, are expected to be used in a variety of products for multiple purposes. Optimizing the design of switching transformers requires the sophisticated magnetic field analysis, thermal analysis, and structural analysis. We present the analysis examples of switching transformers regarding the following most required specification, and provide solutions.
1. Staircase-shape L-I characteristics of a switching transformer with a staircase-type gap
2. Thermal stress caused by high or low temperature due to the material of the spacer of a switching transformer

A non-contact power supply system (NCPS) is a power device which, unlike a trolley, generates electrical power using a magnetic coupling. It is mainly used for the devices for which eco-friendliness is an important factor such as semiconductor overhead transfer systems (OHT) and liquid crystal panel transfer systems. Our company analyzes the secondly power receiving core of NCPS for more efficient design of magnetic circuits. I will describe the properties of a secondly power receiving core and the related issues obtained from the analysis run with JMAG-Studio and JMAG-ELii.

In Ichinokura and Nakamura Laboratory of Tohoku University, a general purpose electromagnetic field analysis software JMAG has been introduced from 2003. We use JMAG to design and analyze various inductors and rotating machinery, and also to verify Reluctance Network Analysis (RNA) which is our original analysis method. In this presentation, I will describe the supervision for students in the electrical machinery using JMAG referring to examples of success and failure.

Learning by using PC is more and more common even in University as well as high school. JMAG is known as specialized software and difficult to learn. Therefore, practice of JMAG by e-learning is considered to be very effective. In this presentation, e-learning in University is introduced and the example of e-learning system for JMAG is presented. Many students could learn how to use JMAG by themselves, and they could solve some practices. Hence, it is very useful to use e-learning system for learning specialized software such as JMAG.

Output characteristics comparison result of IPM and SPM by using experimental and analysis results are reported. Both machine used a same stator and only rotor construction were changed. Iron loss estimation method and measurement result are especially discussed, the accuracy of the analysis results are also discussed. Adding that, the difference between both results including challenging works are reported.