Introduction to ANSYS Maxwell
Getting Started with Maxwell
Maxwell File Structure
– 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
– 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 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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