Completing the Circuit Setup

Parameters for circuit elements must be set using their nodes in the simulation tree. You also create the inductance connection between the primary and secondary coils using the node tree.

To complete the circuit setup:
  1. Select the Circuits > Circuit 1 node and set the following properties:
    • Electrical Substeps to 2
    • Number of allowed groundings to 2

    Substepping the Circuit solver ensures a smooth time integration, and therefore, smoother fields in the circuit. The Number of allowed groupings is set to match the number of groupings required in the sketch.

  2. To define the capacitance and resistance values:
    1. Within the Circuits > Circuit 1 > Circuit Elements node, multi-select nodes, Capacitance, Primary R0, and Secondary Load.
    2. Right-click one element and choose Edit.
    3. In the Multiple Objects dialog, click Expand/Contract Tree followed by Expand/Contract Values.
    4. Set the following properties, then click Close:
      Node Property Value
      Capacitance Load 0.01 farad
      Initial Condition > Voltage Value 2.0 V
      Primary R0 Load 0.001 ohm
      Secondary Load Load 1.0 ohm (default)
  3. To define the inductance connection:
    1. Within the Circuit Elements node, multi-select nodes, Primary and Secondary.
    2. Right-click one of the nodes and choose Create Mutual Inductance Connection.
    3. With the nodes still selected, right-click one node and select Edit.
    4. In the Multiple Objects dialog, click Expand/Contract Tree followed by Expand/Contract Values.
    5. Set the following properties, noting that the entries for Periodicity Factor must be typed directly using the notation shown:
      Node Property Value
      Primary Regions coil1
      Periodicity Factor <1 rev>
      Secondary Regions coil2
      Periodicity Factor <1 rev>
    6. Click Close.
    7. Select the Circuit 1 > Mutual Inductance Connections > Mutual Inductance Connection Compound 1 node and set Periodicity Factor to <1 rev>.
      Due to the axisymmetric nature of the case, each cell of the mesh represents a block of certain depth of one base SI unit. Only full revolutions of the circular windings are visible to the circuit. As a result, you require a scaling factor to model the periodicity of the circuit correctly.
The primary current source is an AC supply of 50 Hz and maximum value of 5 A. Before setting the expression for the circuit element itself, define a global parameter for load current that permits easy adjustment in future studies.
  1. To define a parameters for load current:
    1. In the simulation tree, right-click the Automation > Parameters node and select New > Scalar.
    2. Rename Scalar to I0.
    3. Select the I0 node and set Dimensions to Current and Value to 5.0 A.
  2. To set the primary current source:
    1. Within the Circuits > Circuit 1 > Circuit Elements node, select the Primary Current Source and, next to Load, click (Custom Editor).
    2. Within the dialog, set Definition to:
      $I0*sin(<50 rps>*max($Time-${TimeStep},0))
      For easier editing, you can open the expression editor by clicking (Custom Editor) within the Load dialog.
    3. Click OK.
  3. Save the simulation.