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Tooth-Slot and Air Gap Model

In this sample we investigate magnetic field and current distribution in the simplified model of a slot of electric machine.

The solid rectangular conductor made from cooper lies in the open rectangular slot. The opposite armature core is considered to be toothless.

On the main screen you can enter the geometric dimensions of the tooth, slot, air gap and conductor, as well as a few physical parameters. You can change values or accept default ones. Once you are ready with data editing, press the Calculate button. The QuickField window appears or not depending on the Show QuickField flag.

The calculation consists of following stages:

  1. First the geometry model Slot.mod and the data for DC magnetic problem are created.
  2. Then the main module starts solving of DC magnetic problem and analyze it result. It calculate the entire flux linked with the conductor, the magnetic flux crossing the air gap (a "payload" flux) and the flux leakage. It also calculate the Ohmic resistance and inductance of the conductor per 1 meter of axial length.
  3. Then the geometric model for an AC magnetic problem is created. To take the tooth saturation into account, we divide the tooth into 7 sub-regions. The permeability value achieved in the center of each sub region in the DC problem is set to the AC magnetic problem.
  4. Than the sample program solves the AC magnetic problem and determinates resistance and inductance of the conductor by AC current of specified frequency.

All the calculation results are displayed in the report window. You can save the report to a text file using the Save button.

The Tooth example program employs the COMDLG32 component of MS Visual Basic that can be or can be not installed on your computer. To be sure that all modules needed are installed, use the Setup.exe program for installing the Tooth sample on your computer.

Source codes of the Tooth samples are written in Visual Basic. The program is designed as a set of objects and classes to isolate the calculation and presentation layers. The code that communicates with QuickField is located in the Solver class (Solver.cls file).