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Advanced Magnetics--Step-by-Step Description: Step 16

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At last, we can solve the problem and analyze the solution. To do this in one step:

  1. Click within the problem description tree (on the left side of QuickField window) to activate the view.
  2. On the Problem menu or context menu, click View Field Picture. You will be suggested to solve the problem first, as the results are absent. You should also agree to save the data to the data description file.
  3. Click OK.

Once the problem is solved, the Postprocessor starts automatically and the resulting flux lines through the motor are displayed. There are many options and capabilities for analyzing the results in the Postprocessor. We will only show the steps needed to determine the torque on the rotor. To do this, first we have to define a closed contour in the air gap surrounding the rotor and then ask for the torque value. The necessary steps are as follows:

  1. On the Contour menu, click Add Lines, a dialog box appears allowing manual typing new contour element's parameters.
  2. In Arc Angle area, click Half arc (180°) (we'll create a circular contour by connecting two 180 degree arcs in the middle of the air gap).
  3. Type the coordinates of the first point (x = 12.25, y = 0) and press ENTER.
  4. Change x to -12.25, and press ENTER again, a semicircular path appears.
  5. Press ESC to close the dialog.
  6. On the Contour menu or context menu, click Close Contour.

The postprocessor will connect starting and ending points of the contour (currently consisting of a single arc), using the arc angle shown in Arc Angle box in the toolbar. The area surrounded by the contour becomes highlighted to show that the contour is closed and has positive direction.

To calculate the torque:

  1. On the View menu, click Integral Values, or click correspondent button on the toolbar, a list of Geometric Quantities and Physical Quantities appears under Integral Calculator item in the calculator window.
  2. In the list of Physical Quantities, click the small button to the left of Mechanical torque. The value of torque immediately appears: 2.19 N·m/m. To get full torque of a real electric motor this value has to be multiplied by the axial length of the motor. For the 40 mm long motor it yields 8.7610-3 N·m.
  3. Click Close to go back to the postprocessor window.

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