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Spring,2011

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Product Report

(4) Mesh Generation
Mesh is vital as a parameter which determines the analysis accuracy for the CAE finite element method used in JMAG. The mesh generation features in JMAG are also developed recognizing the CAD link to increase the success when generating mesh for various geometrical models.

For example, defeaturing contributes to improving the stability of the mesh generation and reducing the calculation cost by recognizing and removing detailed geometry that is unnecessary for an analysis, such as C chamfers and screw holes. JMAG also provides a feature to generate symmetrical mesh automatically by identifying the regularity of geometry, which is extremely effective in improving the accuracy of rotating machines. The appropriate mesh can be generated and an accurate magnetic field analysis performed even if the user is not familiar with the program. There are also various control functions for the mesh generation to further increase the accuracy. The element size of solids, faces, edges, and vertices can be specified, mesh simulating the skin effect can be generated, and mesh morphing can modify the geometry directly using the mesh.

Fig.6.Mesh generation

(5) Drag-and-drop Operations
The efficiency of the development process would not improve if the operation in JMAG was complex. For this reason, JMAG provides an intuitive user interface. The material properties and the condition settings can be specified using drag-and-drop operations with the mouse. The settings panel opens when the mouse button is released, and then the settings can be specified by selecting items from a list or entering numerical values in the text boxes. Each of the settings panels links directly to information in the manual through a help button so there is never any confusion about the settings. Warning features built into JMAG caution users when the settings are incomplete. In addition, the magnetization and iron loss characteristics of materials that are vital to analyses are implemented as a database.

The stress of running analyses is further reduced because the materials can be set by selecting from materials cataloged by the material manufacturers.

The settings can be changed and modified easily because all of the specified settings are clearly displayed in a treeview.

Fig. 7.Drag-and-drop operations

(6) Geometry Editor in JMAG
The previous section discussed challenges assuming users that have implemented CAD, but the CAD link features in JMAG can be used by anyone that does not have a 3D CAD system using the Geometry Editor built into JMAG. JMAG's Geometry Editor can be used to create 3D data for the parts required to run an electromagnetic field analysis easily. The geometry editor can be thought of as a light weight CAD system. A powerful CAD link analysis feature can be achieved by linking the Geometry Editor and JMAG.

Fig. 8. Geometry Editor in JMAG

Contents

  1. Implementing JMAG
  2. Product Report
  3. Model-based Design
  4. Impact of FEA on the Design Process
  5. Utilizing Support
  6. JMAG Application Catalog
      70 - Analysis of Impedance-Frequency Characteristics of a Cable
      126 - Magnetization Analysis Accounting for Eddy Currents
  7. Event Information