| Project/Area Number |
06452201
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
電力工学・電気機器工学
|
|---|
| Research Institution | Okayama University |
|---|
Principal Investigator |
NAKATA Takayoshi Okayama University, Department of Electrical and Electronic Engineering, Professor, 工学部, 教授 (50032925)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
FUJIWARA Koji Okayama University, Department of Electrical and Electronic Engineering, Associa, 工学部, 助教授 (20190093)
TAKAHASHI Norio Okayama University, Department of Electrical and Electronic Engineering, Profess, 工学部, 教授 (40108121)
|
|---|
| Project Period (FY) |
1994 – 1995
|
| Project Status |
Completed (Fiscal Year 1995)
|
| Budget Amount *help |
¥5,600,000 (Direct Cost: ¥5,600,000)
Fiscal Year 1995: ¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 1994: ¥2,900,000 (Direct Cost: ¥2,900,000)
|
|---|
| Keywords | Velocity Term / Eddy Current / Moving Coordinate System / Fixed Coordinate System / Finite Element Method / Magnetic Vector Potential / Electric Scalar Potential / ICCG method / 過電流 / 三次元有限要素法 / 電磁スカラポテンシャル / 風上有限要素法 |
|---|
| Research Abstract |
The methods for analyzing 3-D eddy currents in moving conductors are developed and the various methods are compared with each other. The acceleration of the ICCG method which is used as solver for large linear equation systems is also investigated. The results obtained can be summarized as follows :
1.Development of Methods for Analyzing Eddy Currents in Moving Conductors
The methods for analyzing magnetic circuits with moving conductors are systematically classified and the preferable method for each circuit is shown. The treatment of eddy current term using moving and fixed coordinate systems are investigated and the software is developed.
2.Comparison of Various Methods
The methods using moving and fixed coordinate systems are compared with each other from the standpoints of accuracy, memory requirement and CPU time by using a verification model. The results obtained can be described as follows :
(1) In the transient analysis, the moving coordinate system is superior from the standpoints of accuracy, computer storage and CPU time.
(2) In the dc and ac steady state analysis for large Peclet numbers, spurious oscillations occur when using a fixed coordinate system with ordinary Galerkin finite element method. The solution using a moving coordinate system, however, can be obtained with a high reliability. The optimal value of the time step for the moving coordinate system is also clarified.
3.Acceleration of Solving Large Linear Equation Systems
The algorithm for the calculation of the distribution of non-zero entries in ICCG method is improved in order to accelerate the computation. It is shown that the convergence characteristics of the ICCG method for the analysis using magnetic vector potential and edge elements can be considerably massively improved by introducing the electric scalar potential.
|
