Assigning a Winding Setup for a 2D Eddy Current 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 2D > 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. The winding type selected enables only those fields (Initial Current, Resistance, Inductance, Voltage, Phase) applicable for the chosen type.
   2. Select the Solid or Stranded radio button to specify the type of conductor.
   3. For the 2D Eddy Current solver, there is a Get Databases from FFT button. This feature allows the user to get frequency domain signals from transient signals, and solve on the frequencies in Eddy Current designs. For more information, see Using an Eddy Current Excitation to Generate Harmonic Losses.

   4. 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	(no settings required)
      Phase	Inductance
      	Voltage
      	Phase

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

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

   Note: Parallel branches for solid windings assume there are no circulating currents in the parallel branches.
4. Optionally, click Use Defaults to revert to the default values in the dialog box
5. Optionally, on the Defaults tab, click Save Defaults to save the current settings or click Revert to Standard Defaults to revert to the default values in the dialog box.
6. Click OK to assign the excitation to the selected object.

The definition of a winding is final only after specifying the coils which belong to it. To add a coil terminal to this winding:

1. In the Project Manager tree, right-click the winding, and select Add Coils. 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 Manager tree, right-click the winding, and select Assign Coil. The Coil 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. Select one of the following for the Polarity:
• Positive
• Negative
• Function
6. If you selected Function as the Polarity, enter a function in the text box.
7. Optionally, click Use Defaults to revert to the default values in the dialog box.
8. 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 Coils. All coil terminal excitations are removed from the winding and deleted from the excitations.

Related Topics 

Assigning a Coil for a 2D Eddy Current Solver

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.)