# 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 (PS) on the basis of the following data :

• Input terminal
• Current orientation line

Command Orient wires

MY_COIL

2

User orients the section plane (PS) 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 $\stackrel{\to }{v}$ 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/ $\stackrel{\to }{v}$ (1, 0, 0) Horizontal dimension on OX Vertical dimension on OY $\stackrel{\to }{v}$ (0, 1, 0) Horizontal dimension on OY Vertical dimension on OX $\stackrel{\to }{v}$ (0, 0, 1) Not allowed because the OZ direction corresponds to the current direction $\stackrel{\to }{v}$ (1, 0, 0) Horizontal dimension on OX Vertical dimension on OZ $\stackrel{\to }{v}$ (0, 1, 0) Not allowed because the OY direction corresponds to the current direction $\stackrel{\to }{v}$ (0, 0, 1) Horizontal dimension on OZ Vertical dimension on OX