Rotor Eccentricity
The .xgdf file can contain parameters that define the rotor eccentricity, that is, the displacement of the rotor axis with respect to the machine axis.
- Static: the axis of rotation is the rotor axis. The rotor axis is displaced from the machine axis.
- Dynamic: the axis of rotation is the machine axis. The rotor axis is displaced from the machine axis and therefore, from its axis of rotation. With dynamic eccentricity, the rotor wobbles around the machine axis.
Rotor eccentricity can be a 2D or 3D phenomenon. With the machine axis being the global Z-axis, the rotor eccentricity is:
- 2D if the rotor axis is parallel to the machine axis but slightly off-center in the X and/or Y direction. You can model 2D eccentricity using either the EMAG Parts or Thermal Model geometries.
- 3D if the rotor axis is not parallel to the machine axis (that is, the rotor axis is tilted out of the XY plane). You can only model 3D eccentricity using the Thermal Model geometry.
| 2D | 3D |
|---|---|
 |
 |
| mode | Specifies whether the rotor eccentricity mode is static (0) or dynamic (1). |
| dx, dy, dz | Specify the lateral displacement of the rotor about the global origin (0, 0, 0). Simcenter SPEED motors are centered about the global origin. Non-eccentric motors rotate about the global Z-axis. |
| dthx, dthy | Specify the X-tilt
displacement and Y-tilt displacement of the rotor. The axis of rotation of the rotor is not parallel to the axis of the stator. In this configuration, the air gap profile at one end of the machine is different to the profile at the other end and the model includes axial forces as well as radial forces. X-tilt displacement rotates the rotor about the X-axis of the global origin (up or down), using the right-hand rule. Y-tilt displacement rotates the rotor about the Y-axis of the global origin (left or right), using the right-hand rule. |
<eccentricity>
<mode> 0 </mode>
<dx> 0 </dx>
<dy> 0 </dy>
<dz> 0 </dz>
<dthx> 0 </dthx>
<dthy> 0 </dthy>
</eccentricity>