Coil magnetostatics¶

COIL_MAGNETOSTATICS chains current conduction into magnetostatics: it solves a coil's current distribution, then the magnetic field that current drives. It also reads the Magnetostatics conditions, so magnets and force Components work as they do there. See Conditions and physics for how conditions attach and where they land.

Frame	Solves as	Solver stack
Solid	`COIL_MAGNETOSTATICS`	CoilCurrentSolver, MagnetoDynamicsSolver, MagnetoDynamicsCalcFieldsSolver, SaveScalarsSolver, ResultOutputSolver
Axisymmetric	no form
Cartesian2D	no form

Material-wired conditions¶

Condition	Target	Sets	Frames
`Magnetization`	body	`direction`	Solid

Boundary conditions¶

Condition	Target	Sets	Frames
`CoilTerminal`	outer shell	`role`	Solid

CoilTerminal¶

Physics COIL_MAGNETOSTATICS · Target outer shell · Section Boundary Condition · Kind coil_terminal · API CoilTerminal

One end of an open coil, its start or end electrode.

Field	Symbol	Unit	Meaning	Sif keyword	Default
`role`			Which end of the coil this electrode is; CoilSolver's normalized current flows start -> end.		required

Writes: The Coil Start or Coil End flag for this role.

The electrode's end face must lie on the domain boundary (GeometryConfig.terminate_electrodes). Positive coil current flows from the start electrode to the end electrode.

Components¶

Condition	Target	Sets	Frames
`CoilDrive`	body	`current` [A]	Solid
`CalculateMagneticForce`	body	`label`, `calculate_magnetic_force`, `calculate_magnetic_torque`, `torque_origin` [m], `torque_axis`	Solid

CoilDrive¶

Physics COIL_MAGNETOSTATICS · Target body · Section Component · Kind coil_drive · API CoilDrive

A driven massive coil: the bodies that share one CoilDrive form one coil that carries current.

Field	Symbol	Unit	Meaning	Sif keyword	Default
`current`	`I_coil`	A	The total coil current CoilSolver normalizes this coil's solved distribution to.	`Desired Coil Current`	required

Writes: The Desired Coil Current and the massive Coil Type.

Bodies that share one CoilDrive instance form one coil. Reverse a coil by swapping its terminal roles, and keep current positive. Without a CoilDrive, the sif writer warns that the coil has no source. COIL_MAGNETOSTATICS leaves FixedPotential inert.