Skew

Overview
BAR – SKEW design area
1 Selection of the ROTOR subset: MAGNET panel (Click on the icon MAGNET).
2 SKEW tab indicates the tools to define the rotor (magnet) skewing angle.
3 Visualization of the motor radial view with bar topology and dimensions.
4 Visualization of the rotor developed view to visualize the rotor (magnet) skewing.
5 Choices to define a skew: None – Continuous (Continuous in our example).
6 Skew inputs to be defined.
7 Buttons to restore the default input values.
8 Buttons to validate the inputs (Pressing the “enter key” twice applies inputs too).
9 Skew outputs (read only).
10 Button to export the skew data into *.txt or *.xls files.

Continuous skew

Set a skew angle
How to set a skew angle?
1 Choose the definition mode of the skew:Stator slot – Rotor slot – Shift angle.
2 Definition of the skew angle depending of the definition mode.
3 Visualization of the chosen skew angle on the machine radial view.
4 Visualization of the equivalent axial slot angle on the rotor developed view.
5 Equivalent axial rotor slot angle (read only).
6 Equivalent stator slot pitch (read only).
7 Equivalent rotor slot pitch (read only).
Note: The user can add a skew angle on the rotor or on the stator. If a skew is already defined in the stator when setting a skew on the rotor, the stator skewing will be automatically reset to “None”.

Step skew

Linear step skew
How to define a linear step skew?
1 Linear step skew definition mode
2 Choose the definition mode of the skew:
  • Stator slot
  • Rotor slot
  • Shift angle
3 Number of layers
4 Virtual magnet opening to adjust the axial view to any size of magnet opening
5 Equivalent stator slot pitch (read only)
6 Equivalent rotor slot pitch (read only)
7 Visualization of the chosen skew angle on the machine radial view
8 Visualization of the rotor developed view resulting from the axial slot angle, the number of layer and the virtual magnet opening
Note: The user can add a skew angle on the rotor (continuous or step) or on the stator (continuous). If a skew is already defined in the stator when setting a skew on the rotor, the stator skewing will be automatically reset to “None”.

V shape
How to define a V shape step skew?
1 V shape step skew definition mode
2 Choose the definition mode of the skew:
  • Stator slot
  • Rotor slot
  • Shift angle
3 Number of layers
4 Virtual magnet opening to adjust the axial view to any size of magnet opening
5 Equivalent stator slot pitch (read only)
6 Equivalent rotor slot pitch (read only)
7 Visualization of the chosen skew angle on the machine radial view
8 Visualization of the rotor developed view resulting from the axial slot angle, the number of layer and the virtual magnet opening
Note: The user can add a skew angle on the rotor (continuous or step) or on the stator (continuous). If a skew is already defined in the stator when setting a skew on the rotor, the stator skewing will be automatically reset to “None”.

Customized skew
How to define a customized step skew?
1 Custom step skew definition mode
2 Click in the button “Set values” of the field “Step skew description” to open a dialog box to define the custom step skew.

Refer to the next illustration which shows how to fill the Custom step skew table.
3 Virtual magnet opening to adjust the axial view to any size of magnet opening
4 Equivalent stator slot pitch (read only)
5 Equivalent rotor slot pitch (read only)
6 Visualization of the chosen skew angle on the machine radial view
7 Visualization of the rotor developed view resulting from the axial slot angle, the number of layer and the virtual magnet opening


Step skew description – Dialog box to define the custom step skew
1 Dialog box opened after having clicked on the button “Set values” in the field “Step skew description”.
2 Browse the folder to select an Excel file which is described the custom step skew configuration.
3 Button to refresh the table data when the considered Excel file has been modified.
4 Fields to be filled with data to describe the step skew configuration to be considered.
Note: The first value of the shift angle must be “0”
Note: The shift angle of each layer (or index) refers to the reference axis given by the dash line in the axial view (position of the first layer).
Note: The sum of the thickness of each layer must be egal to the rotor length.
Note: The user can add a skew angle on the rotor (continuous or step) or on the stator (continuous). If a skew is already defined in the stator when setting a skew on the rotor, the stator skewing will be automatically reset to “None”.