Transient A-Phi Formulation Boundaries and Excitations
The Transient A-Phi solver is an alternative to the default TAU transient solver. The A-Phi solver allows multi-terminal conductors and it supports sources of various types on a single conduction path; the J and E fields are calculated directly because it is a first-order approximation. A is the Magnetic Vector Potential and F (Phi) is the Electric Scalar Potential.
To use this solver, define at least one of the following as a source of magnetic fields:
- A voltage or current.
- Stranded or solid windings, with a voltage
or current supply or connected to an external circuit winding.
Note: For stranded conductors, it is assumed that the current density is uniform on the cross-section of the respective conductors. Thus, the stranded option for current excitations should mostly be used only in cases where the cross-section of conductors is constant, consistently with the assumption that the respective object is a coil built with strands of wire. For this reason, conductors (coils) could be created by either sweeping around an axis using zero segments or sweeping along a path having only true surface segments in order to create a smooth surface coil having a completely uniform cross-sectional area over its entire length.
- A permanent magnet.
You may need to set at least one outer boundary to the following:
- The default boundary conditions.
- An odd symmetry (flux tangential) boundary.
- An even symmetry (flux normal) boundary.
Related Topics
Technical Notes: A-Phi Formulation in Maxwell 3D (Transient)
Transient A-Phi Formulation Boundaries
Transient A-Phi Formulation Excitations