Transient magnetics allows performing transient or steady state AC analysis designing a variety of DC or AC devices such as electric motors, transformers , and so forth. Generally the quantities of interest in transient magnetics analysis are time functions of magnetic flux density, field intensity, external, induced and total current densities, forces, torques, inductance, and flux linkage.
The transient magnetic field simulation can be coupled with electric circuit. The circuit can contain arbitrarily connected resistors, capacitors, inductances, voltage and current sources, and solid conductors located in the magnetic field region.
QuickField can perform linear and nonlinear transient magnetic analysis for 2-D and axisymmetric models. The program is based on a vector potential formulation. Following options are available for transient magnetic analysis:
Material properties: air, orthotropic materials with constant permeability,
ferromagnets, time-dependent current carrying conductors, and permanent magnets. B-H
curves for ferromagnets can easily be defined through a curve editor.
Electrical conductivity can depend on temperature. The dependency of conductivity on temperature is given in tabular form using the curve editor. The temperature can be specified separately for each block by a number or a formula of time and coordinates.
Loading sources: time-dependent current or current density, uniform external field and permanent magnets. QuickField introduces powerful formula facility allowing to define time dependency with a wide set of intrinsic functions.
Boundary conditions: Prescribed potential values (Dirichlet condition), time-dependent prescribed values for tangential flux density (Neumann condition), constant potential constraint for zero normal flux conditions on the surface of superconductor
Postprocessing results: magnetic potential, flux density, field intensity, external, induced and total current densities, forces, torques, magnetic energy, flux linkage, self and mutual inductances.
Special features: Formula Editor, a new powerful tool, allows specifying virtually any type of time-dependent sources (currents and current densities, Neumann boundary condition). Postprocessing calculator is available for evaluating integrals on user-defined curves and surfaces. The magnetic forces can be used for stress analysis on any existing part (magneto-structural coupling). Joule heat generated in the conductors can be used for transient heat transfer analysis of your model (electro-thermal coupling). QuickField provides a special type of inter-problem link to import field distribution from another problem as initial state for transient analysis.
Transient magnetic formulations in Theoretical Description
Transient magnetic examples