Defining magnetic permeability

For a time-harmonic eddy current analysis, you must define the material's magnetic permeability. You can specify magnetic permeability that is isotropic, orthotropic, or fully anisotropic. See the following sections for more information:

  1. From the menu bar in the Edit Material dialog box, select Electrical/MagneticMagnetic Permeability.

    (For information on displaying the Edit Material dialog box, see Creating or editing a material.)

  2. Toggle on Specify using nonlinear B-H curve to define nonlinear magnetic permeability.

    Columns labeled B and H replace the Magnetic Permeability column used for linear data in the Data table.

  3. Click the arrow to the right of the Type field, and specify the directional dependence of the magnetic permeability.

  4. Toggle on Use frequency-dependent data to define magnetic permeability that varies with frequency.

    A column labeled Frequency appears in the Data table.

    Note:

    Frequency dependence is not available for nonlinear magnetic permeability.

  5. Toggle on Use temperature-dependent data to define magnetic permeability as a function of temperature.

    A column labeled Temp appears in the Data table.

  6. Click the arrows to the right of the Number of field variables field to increase or decrease the number of field variables on which magnetic permeability depends.

  7. Enter the applicable data in the Data table:

    B

    Strength of the magnetic flux density vector.

    You must provide a single set of values for isotropic nonlinear magnetic permeability and a set of values for each of the three principal directions for orthotropic nonlinear magnetic permeability.

    H

    Strength of the magnetic field vector.

    You must provide a single set of values for isotropic nonlinear magnetic permeability and a set of values for each of the three principal directions for orthotropic nonlinear magnetic permeability.

    Magnetic Permeability

    Isotropic linear magnetic permeability. (Units of FA−2.)

    mu11(E), mu22(E), and mu33(E)

    Three values for orthotropic linear magnetic permeability, μ11, μ22, and μ33. (Units of FA−2.)

    mu11(E), mu12(E), mu22(E), mu13(E), mu23(E), and mu33(E)

    Six values for anisotropic linear magnetic permeability, μ11, μ12, μ22, μ13, μ23, and μ33. (Units of FA−2.)

    Frequency

    Frequency in cycles/time.

    Temp

    Temperature.

    Field n

    Predefined field variables.

    You may need to expand the dialog box to see all the columns in the Data table. For detailed information on how to enter data, see Entering tabular data.

  8. Click OK to close the Edit Material dialog box. Alternatively, you can select another material behavior to define from the menus in the Edit Material dialog box (see Browsing and modifying material behaviors, for more information).