Setting Up Coil Physics

For the two coils (primary and secondary), you define a single physics continuum that includes the excitation model and the electric circuit model. Regions that are assigned to this continuum expose a parameter for defining the number of turns in the excitation coil.

To define the physics continuum for the coils:
  1. Create a new physics continuum and rename it to Coil Physics.
  2. For the Coil Physics continuum, select the following models:
    Group box Physics Model
    Space Axisymmetric
    Time Implicity Unsteady
    Material Solid
    Optional Models Electromagnetism
    Enabled Models Gradients (selected automatically)
    Electromagnetism Transverse Magnetic Potential
    Enabled Models Eddy Current Suppression (selected automatically)
    Optional Models Excitation Coil
    Optional Models Excitation Coil Lumped Parameter
    Optional Models Circuit Model

    The Eddy Current Suppression model neglects eddy currents in the coil regions.

  3. To set the material properties for the coil:
    1. Expand the Coil Physics > Models > Solid node, right-click the Al node and select Replace with.
    2. In the Replace Material dialog, expand the Material Databases > Standard > Solids node and activate Cu (Copper).
    3. Click OK.
  4. To define the number of windings and field direction for the primary coil region:
    1. Select the Regions > coil1 node and set Physics Continuum to Coil Physics.
    2. Select the coil1 > Physics Values > Electric Current Density Magnitude > Ampere Turn node and set Number of Turns to 100.
    3. Select the coil1 > Physics Values > Local Direction Field node and set Direction to Return.
  5. To define the number of windings for the secondary coil region:
    1. Select the Regions > coil2 node and set Physics Continuum to Coil Physics.
    2. Select the coil2 > Physics Values > Electric Current Density Magnitude > Ampere Turn node and set Number of Turns to 150.
    For the secondary coil, the local field direction remains at the default setting (Go).
Electric current profiles are applied in a later step when you select coil regions for the excitation coil circuit element.