Assigning a Winding Setup for a Transient Solver

You can use the predefined coil terminal(s) to define one or more current or voltage windings.

To define a winding for your model:

1. Click Maxwell 3D > Excitations > Add Winding. to open the Winding dialog box.
2. Enter a name for the winding in the Name box, or accept the default.
3. In the Parameters section:

   1. Select Current, Voltage, or External from the Type drop-down menu.

      Note: Maxwell transient designs can be dynamically coupled to Twin Builder components through the Twin Builder user interface. You can enable this feature on the Advanced Product Coupling tab of the Design Settings dialog box. Source windings set to External are available as conservative pins in Twin Builder. For more information, refer to the Twin Builder Help.
   2. Select the Solid or Stranded radio button to specify the type of conductor.

   3. Enter values in the following fields (enabled according to winding type), and select the desired units.

      For a current winding	For a voltage winding1	For an external winding
      Current	Resistance	Initial Current
      	Inductance
      	Voltage
      	Initial Current

      Note: You can also type a function as an expression for any of these fields except Initial Current.

   4. Enter a value in the Number of parallel branches text box.

      Note: For the Number of parallel branches setting, the basic assumption is that the windings are symmetric and balanced, so the current split is forced to be equal in parallel branches. For solid or stranded windings, the Number of parallel branches setting assumes there are no circulating currents in the parallel branches.

      For solid windings, the Number of parallel branches setting is intended for applications meeting these conditions: For example, a periodic electric machine wedge model having solid hairpin windings, where the parallel branches are in the symmetric parts of the periodic model. In order to include unbalanced circulating currents this Number of parallel branches setting is not applicable, and you must use separate windings for each parallel branch that is connected in an external circuit.

4. Optionally, click Use Defaults to revert to the default values in the window.
5. Click OK to assign the excitation to the selected object.

A winding is now defined for your model.

To add a coil terminal to this winding, do the following:

1. In the project tree, right-click the winding, and select Add Terminals.
   The Add Terminals dialog box appears, listing all coil terminals that do not already belong to that winding.
2. Select the coil terminal (s) you want to add. To select multiple terminals, press Ctrl and click each terminal.
3. Click OK.

To assign a coil terminal excitation and add it to this winding:

1. Select the section of the geometry on which you want to apply the coil terminal excitation.
2. In the project tree, right-click the winding, and select Assign Coil Terminal.
   The Coil Terminal Excitation dialog box appears.

3. Enter a name for the excitation in the Name box, or accept the default.

4. In the Parameters section, enter the number of conductors for the coil in the Number of Conductors box.

   Note: This value represents only the number of conductors inside of the selected geometry. If the Coil Terminal is cut due to symmetry, then only enter the Number of Conductors in the portion modeled

5. Click Swap Direction to change the reference direction for the coil terminal. You can also change this direction in the coil terminal's Properties window by selecting either Point into terminal, or Point out of terminal for the Direction parameter.

6. Optionally, click Use Defaults to revert to the default values in the dialog box.

7. Click OK to assign the coil terminal excitation.
   The coil terminal excitation is assigned and is added to the winding.

To delete all coil terminal excitations that belong to this winding:

• In the Project Manager tree, right-click the winding, and select Delete All Terminals.
  All coil terminal excitations are removed from the winding and deleted from the excitations.

Related Topics 

Winding Excitation for A-Phi Formulation

Assigning a Coil Terminal for a Transient Solver

Setting Up an External Circuit Connection for an External Winding Type

Setting Up a Y Connection in 2D and 3D Transient Designs

1. For a solid winding, the resistance term can represent: the resistance of a portion of the winding which is not modeled (for instance, end-effects), the leads connecting the winding to the source, or the source resistance. (The main winding resistance is calculated directly by the solver.) For a stranded winding, the resistance term is the complete DC resistance of the winding (since the solver does not determine resistance of a stranded winding) as well as the resistance of the end-effects, leads, source, etc. For both solid and stranded windings, the inductance term can represent: the extra inductance for a portion of the winding of the winding which is not modeled (for instance, end-effects), the leads connecting the winding to the source, or the source inductance. (The main winding inductance itself is calculated directly by the solver.)