Computer-Aided Design in Magnetics

ISBN-13: 9783642706738 / Angielski / Miękka / 2011 / 324 str.

D. a. Lowther; P. P. Silvester

Opis

Computer-aided design has come of age in the magnetic devices industry. From its early beginnings in the 1960s, when the precision needs of the experimental physics community first created a need for computational aids to magnet design, CAD software has grown to occupy an important spot in the industrial designer's tool kit. Numerous commercial CAD systems are now available for magnetics work, and many more software packages are used in-house by large industrial firms. While their capabilities vary, all these software systems share a very substantial common core of both methodology and objec tives. The present need, particularly in medium-sized and nonspecialist firms, is for an understanding of how to make effective use of these new and immensely powerful tools: what approximations are inherent in the methods, what quantities can be calculated, and how to relate the com puted results to the needs of the designer. These new analysis techniques profoundly affect the designer's approach to problems, since the analytic tools available exert a strong influence on the conceptual models people build, and these in turn dictate the manner in which they formulate prob lems. The impact of CAD is just beginning to be felt industrially, and the authors believe this is an early, but not too early, time to collect together some of the experience which has now accumulated among industrial and research users of magnetics analysis systems.

Spis treści

Analysis Methods in Electromagnetics.- The System Life-Cycle.- Computing Equipment for CAD.- Finite Element Analysis Systems.- Magnetic Material Representation.- Modelling of B-H Curves.- Management of Material Property Files.- Data Entry and Editing.- Complex Magnetic Materials.- Curve Modelling Theory.- The Potential Equations of Magnetics.- Electromagnetic Fields and Potentials.- Potential Problems of Electromagnetics.- Magnetic Scalar Potentials.- Time-Varying Potential Problems.- Rotational and Translational Symmetries.- Problem Modelling and Mesh Construction.- Geometric Modelling and Discretization.- Mesh Generation and Editing.- Multi-Model Operations and Model Libraries.- Batch and Interactive CAD Systems.- Practical Mesh Construction.- Automating the Mesh-Building Task.- Assembly of Problems.- Field Problems in Magnetic Devices.- Analysis in Design.- Analysis by Successive Refinement.- Subproblem Analysis.- Boundary Conditions.- Geometric Shape Alteration.- Reducing Three Dimensions to Two.- Planning the Solution.- Postprocessing Operations in CAD.- Inductance Calculations.- A Transformer Design Problem.- Mutual Inductances.- Force Calculations.- Local Field Values.- Linear Time-Varying Problems.- Electrostatic Calculations.- Effects of Numerical Approximations.- Postprocessing Systems for Magnetics.- Postprocessor Structure and Use.- Manipulation of Local Data.- Mathematical Postprocessor Operations.- Graphic Displays of Results.- Graphic Input.- The Custom Postprocessor.- CAD Systems Present and Future.- System Structure.- Processes in CAD.- Interactive Command Languages.- Programmability of CAD Systems.- Workstation Layout.- Interactive CAD Systems for Magnetics.- Batch-Run CAD Systems.- The Literature of CAD in Magnetics.- Publications on Magnetics CAD.- An Annotated Bibliography.