Running the Simulation

Before running the simulation you define the initial current as well as the time-step and maximum physical time in terms of the rotation rate. Also to reduce the simulation time, you apply a minimum limit to the magnetic vector potential residual using a monitor criterion.

To set the initial current:
  1. Select the Automation > Parameters > I_0 node and set Value to 140.
To define the time-step and maximum physical time:
  1. Select the Solvers > Implicit Unsteady node and set Time Step to <1 deg>/${RR}.
    This expression sets the time-step to the time taken for the axial flux motor to rotate by 1 °.
  2. Right-click the Implicity Unsteady > Stopping Criteria node and select New Monitor Criterion.
  3. In the Select Monitor dialog, select Magnetic Vector Potential.
  4. Select the Magnetic Vector Potential Criterion > Minimum Limit node and set the Minimum Limit to 1.0E-8.
  5. Expand the Stopping Criteria node and set the following properties:
    Node Property Setting
    Maximum Inner Iterations Maximum Inner Iterations 10
    Maximum Physical Time Maximum Physical Time <72 deg>/${RR}

    The maximum physical time is defined as the amount of time taken for the axial flux motor to rotate by 72 °.

  6. Click (Run).
  7. Open the Plots > Magnetic Flux Linkage 1 Monitor Plot.


    The magnetic flux linkage plot shows the sinusoidal nature of the magnetic flux through coil number four as the rotor rotates. The magnetic flux reaches a maximum around halfway through the simulation time.
  8. Open the Magnetic Torque - Rotors and Magnets Monitor Plot.


    The magnetic torque of the motor oscillates between 12.9 Nm and 13.9 Nm, leading to an average running torque of the motor of 13.3 Nm. The plot also demonstrates the torque ripple which occurs in the motor as it rotates. If you were to run the case with a current of zero the average torque is equal to the cogging torque.
  9. Open the Scenes > Magnetic Flux Density - Magnitude scene.
  10. Multi-select the Magnetic Flux Density - Magnitude > Outline 1 and Scalar 1 nodes and set Representation to AxialFluxMotor.
  11. In the Playback toolbar, click (Play/Pause Animation in active scene).