15.10. Using the GSP Method for 3D Static Scalar Magnetic Analysis

You can step manually through the three-step solution sequence for a GSP analysis. To do so, follow this procedure:

  1. Specify options for the first load step. This will yield an approximate iron-only solution. To do so, set VALUE = 1 for the MAGOPT command or choose Main Menu> Solution> Load Step Opts> Magnetics> Options Only> GSP Method.

    Command(s): MAGOPT
    GUI: Main Menu> Solution> Load Step Opts> Magnetics> Options Only> GSP Method

  2. Set the convergence criteria using the CNVTOL command or its GUI equivalent.

  3. Specify that results are not saved, using either of the following:

    Command(s): OUTRES,ALL,NONE
    GUI: Main Menu> Solution> Load Step Opts> Output Ctrls> DB/Results File

  4. Set the full Newton-Raphson option with adaptive descent. To do so, use either method shown below:

    Command(s): NROPT
    GUI: Main Menu> Solution> Analysis Type> Analysis Options

  5. Write the load data to a load step file, via one of these methods:

    Command(s): LSWRITE or SOLVE
    GUI: Main Menu> Solution> Load Step Opts> Write LS File
    Main Menu> Solution> Solve

  6. Specify load step options for the second load step (which produces an approximate air-only solution). This time, set the VALUE field to 2 on the MAGOPT command or its GUI equivalent and again, specify one substep.

  7. Use the LSWRITE command or the Write LS File menu option to write load data to a load step, as discussed in step 2 above.

  8. Specify load step options for the third load step (which gives the final solution). To do so, set VALUE = 3 on the MAGOPT command or its GUI equivalent.

  9. Store the final results using the OUTRES,ALL,LAST command or its GUI equivalent.

  10. Start calculating the solution by using one of the following:

    Command(s): LSSOLVE or SOLVE
    GUI: Main Menu> Solution> Solve> From LS Files
    Main Menu> Solution> Solve

  11. Once you have solved the model, review the results as described for the RSP method.

An example command sequence for a nonlinear GSP method static analysis follows:

/solu
magopt,1              ! Partial solution in iron
cnvtol,flux,,le-3     ! Set convergence criteria
outres,all,none       ! Do not store results
nropt,full,,on        ! Full Newton-Raphson, adaptive descent
solve	  						  ! Solve
magopt,2              ! Partial solution in air
solve						    ! Solve
magopt,3              ! Final solution
outres,all,last       ! Store converged solution
solve