Introduction to ANSYS Maxwell

Getting Started with Maxwell

Maxwell GUI

Maxwell Designs

Maxwell Solvers

Maxwell File Structure

Geometry Operations

– ANSYS Maxwell uses primitive based modeling technique where basic structure is created using Geometry Primitives and then Geometry operations are performed to achieve final object

– The underlying solid modeling technology used by Maxwell products is provided by ACIS geometric modeler.

– Geometry can also be created in ANSYS Design Modeler and can be used in Maxwell through ANSYS Workbench interface which has been discussed in APPENDIX

Static Magnetic Solvers

– In the Magnetostatic Solver, a static magnetic field is solved resulting from a DC current flowing through a coil or due to a permanent magnet

– The Electric field inside the current carrying coil is completely decoupled from magnetic field

– Losses are only due to Ohmic losses in current carrying conductors

– The Magnetostatic solver utilizes an automatic adaptive mesh refinement technique to achieve an accurate and efficient mesh required to meet defined accuracy level (energy error).

Static Electric Solvers

– The Electrostatic solver solves for the static electric fields resulting from stationary charge distribution or applied potentials

– Electric Field (E) and Electric Flux Density (D) are automatically calculated from the scalar potential (ø)

– All fields inside conductors are assumed to be perfect and equipotential in an electrostatic equilibrium (no current flow), therefore Joule losses are zero everywhere

– The Electrostatic solver utilizes an automatic adaptive mesh refinement technique to achieve an accurate and efficient mesh required to meet defined accuracy level (energy error)

Maxwell Transient Solvers

– The Magnetic Transient Solver computes time varying magnetic fields

– This is a time domain solver and solves for instantaneous magnetic fields at each time step

– The source of the Time varying magnetic field can be:

• Arbitrary time-varying voltage or current sources

• Moving Sources

• Moving permanent magnets

– Field Quantities can also be strongly coupled with circuit equations to allow arbitrarily defined external circuits

– Magnetic Transient solver does not use Adaptive mesh refinement and thus mesh operations or a Linked Mesh is required to be defined to obtain a sufficient mesh.

Meshing and Mesh Operations

– Maxwell uses the Finite Element Method (FEM) to solve Maxwell‘s equations.

– In order to obtain the set of algebraic equations to be solved, the geometry of the problem is discretized automatically into basic building blocks(e.g.,tetrahedra in 3D).

– The assembly of all tetrahedra is referred to as the finite element mesh of the model or simply the mesh.

– Mesh plays important role in accuracy of the computed results and thus requires higher mesh resolution in regions where field fields are of interest rapidly

Maxwell Postprocessing

– ANSYS Maxwell has very powerful and flexible data management and plotting capabilities.

– The following postprocessing options are discussed in detail in this lecture

• Field Overlays

• 2D and 3D Report plot

• Fields Calculator

• Output Variables

• Design Summery

Optimetrics Analysis

– Optimetrics Analysis can be used to perform design studies where input variable variations affect the output

– Input parameters can be any geometrical or excitation parameter while output parameter can be any postprocessing quantity

– Following analyses can be add under Optimetrics

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