Coil conductor with losses regions in 3D

3D coil and section plane

In 3D, the coils are defined by a group of volumes. They can be opened or closed as it is represented in the following figure.

In 3D, the elementary strands section is defined by the plane perpendicular to the current (=section plane). The plane section choice, orientation and the specific data linked to the circular and rectangular section are described in the following blocs.

How it works

Section plane choice and orientation: how it works in 3D?

The functioning process is described in few words in the following table and explained in more details in the following blocs.

Stage	Description	Command
1	Flux determine a section plane (P_S) on the basis of the following data : Input terminal Current orientation line	Command Orient wires … MY_COIL
2	User orients the section plane (P_S) thanks to the following data : Section orientation vector Rotation angle	New > Edit Region … MY_BOBINE

Stage

Description

Command

1

Flux determine a section plane (P_S) on the basis of the following data :

Input terminal
Current orientation line

Command Orient wires …

MY_COIL

2

User orients the section plane (P_S) thanks to the following data :

Section orientation vector
Rotation angle

New > Edit Region …

MY_BOBINE

Caution: there is interdependency between the 2 commands:

The section plane choice is done with the command Orient wires
The section plane orientation is done with the command New > Edit Region

The section plane chosen by Flux

Flux determine the section plane as following:

For an opened coil: the section plane is the plane perpendicular to the current and corresponds to the input & output terminal plane
For a closed coil: the section plane is perpendicular to the current and it is “the nearest one to the input terminal” (in the current direction)

Closed coil

Opened coil

The orientation … (managed by user)

User orients the section plane as following:

The orientation data are presented in the following table.

Element	Function
Coordinate system for definition	Coordinate system for orientation vector definition
Orientation vector $\vec{v}$	Vector in the section plane*, which defines the direction called horizontal
Rotation angle θ (optional)	Supplementary rotation angle of the orientation vector

Element

Function

Coordinate system for definition

Coordinate system for orientation vector definition

Orientation vector

\vec{v}

Vector in the section plane*, which defines the direction called horizontal

Rotation angle θ (optional)

Supplementary rotation angle of the orientation vector

Note: * If the orientation vector is not in the section plane, Flux project it in the section plane

Examples

Some simple examples (without rotation) are presented in the table below. The orientation vector is defined in the coordinate system drawn in the figure/