Imposed Current Coil - 3D Solutions

Introduction for 3D Magnetostatic solution

The Imposed Current Coil allows you to define a body as a coil and enter the associated physical data.

Note: See Coils modeling for more explanations about the different possibilities of modelling of coils.

Introduction for 3D Transient Magnetic and 3D Magnetic AC solutions

The Imposed Current Coil allows you to define a body as a coil with an imposed current value.

Note: See Coils modeling for more explanations about the different possibilities of modelling of coils.

Note: For Transient magnetic solutions, usually a Circuit Designer is created and the usage of Imposed Current Coil is not common. For this reason, this load button is hidden:

Dialog Box


MS3D and MT3D		MAC3D
Internal Terminals	External Terminals	Internal Terminals	External Terminals

Select body: Select the body to define as a coil
Number of turns: Enter the number of turns of the coil
Current Value: Enter the current value

Note: For the 3D Magnetic AC solution, enter the rms value
Current phase for the 3D Magnetic AC solution only, enter the current phase value

Conductor connection: is used if symmetry or periodicity entities are existing. This input allows to define the symmetric or periodic coils as in Series or in Parallel or with Number of conductors in parallel. That means that if a current "I" is flowing into the represented coil, then each symmetric or periodic coil will have:

in series: I
in parallel: I divided by the total number of coils in the complete device

Note: for example, if the device has one symmetry, the current on the represented coil and in the symmetric coil will be I/2. If the device has a periodicity with a total of 6 portions, the current on each portion coil will be I/6.

with Number of conductors in parallel:

Table 1. Possible associations between periodical conductors in the example.
Symmetries and Periodicites: number of conductors in series or in parallel	Equivalent circuit association between conductors
All in series or Number of symmetrical and periodical conductors in parallel = 1
Number of symmetrical and periodical conductors in parallel = 2
Number of symmetrical and periodical conductors in parallel = 3
All in parallel or Number of symmetrical and periodical conductors in parallel = 6

Current orientation: allows to define the current orientation into the coil body. There are two possibilities:
- Internal Terminals: defines the current orientation in a closed coil (not cut by a symmetry nor periodicity). To define this orientation, Input terminal faces corresponding to coil body's internal face(s) have to be selected. As soon as this selection is done, a preview of the current direction is displayed through an arrow. It is possible to change the direction through Reverse orientation checkbox.
- External terminals: defines the current orientation in a coil which is not closed (cut by a symmetry or periodicity). To define this orientation, Input terminal faces and Output terminal faces have to be selected.

Steps

Prerequisite: The bodies to define as Imposed Current Coils must be volume meshed.
Click on the Imposed Current Coil button in Analysis ribbon:

→ The corresponding dialog box is opened.

→ If there are already created Imposed Current Coil entities, the associated previews become visible on the graphic. It allows an easy definition if the device contains several coils.
Select the body corresponding to a coil
Enter the Number of turns
→ You can see that now only the selected body is shown on the graphic
Enter the Current Value
Select the Conductor connection
There are three possibilities: Series or Parallel or Number of conductors in parallel. (See Conductor connection for more explanations)
Select the Current orientation
There are two possibilities: External terminals or Internal terminals
1. Internal terminals is selected when the coil is closed and is fully represented (not cut by symmetry or periodicity).
  1. Select face(s) in Input terminal faces corresponding to coil body's internal face(s).
    
    → As soon as this selection is done, only body's internal face(s) are visible and a preview of the current direction is displayed through arrow(s) starting from the Input terminal faces
  2. It is possible to reverse the direction through Reverse orientation checkbox and see the preview updated.
  Note: To create internal face(s) in the coil body, please follow the workflow using Break command on CAD bodies detailed in Break
2. External terminals is selected when the coil is not closed (cut by symmetry or periodicity)
  1. Select the Input terminal faces
    It is the face(s) through which the current enters
    → A preview of the current direction is displayed through arrow(s) on the Input terminal faces
  2. Select the Output terminal faces
    It is the face(s) through which the current exits
    → A preview of the current direction is displayed through arrow(s) on the Output terminal faces
If there are already created Imposed Current Coils, it is possible to check again the defined orientation in comparison with the existing ones by clicking on any field which is not Input/Output faces field.
Click on the OK or Apply button
Note: Apply button is trully advised in case of several Imposed Current Coil entities creation.

Note: As a reminder, in Magneto Static 3D solution, there is no need to assign a Material to Imposed Current Coil body (if assigned, it is not taken into account in the simulation).

Display Imposed Current Coil preview

Adding to the preview visualisation during Imposed Current Coil creation and edition, the command Display Preview allows to display Imposed Current Coil previews at any time.

For that, right-click on the Imposed Current Coil entities and click on Display Preview command.

→ All the selected Imposed Current Coil entities previews become visible on the graphic:

The command Hide All Previews in the same contextual menu allows to hide the preview and reset the graphical view.

Advices

For Internal terminals current orientation, To create internal face(s) in the coil body, please follow the workflow using Break command on CAD bodies detailed in Break

Note: It is also possible to run the Break command on surface meshed bodies. But, in this case, the bodies must be remeshed because the faces of the break plane are not meshed correctly after the Break command.

Warning: Running the Break command on meshed bodies already assigned to the Solution and/or to Loads and Constraints is possible but not recommended because the names of the bodies can change, which leads to the loss of the assignment to the different entities, thus the reassignment should be done by hand.