Saliency

Saliency physical properties

  1. Example for an inner saliency

    Here is an example of regions in inner saliency.

    Table 1. Regions for inner bar


    1 Flux barrier
    2 Web
    3 Bridge
    4 Yoke
  2. List of possible elementary regions for an inner saliency.
    • Yoke, web, bridge, pole core, pole shoe, interpole
    • Flux barrier, hub, edge
    • Mechanical device to represent rivet for example
    • Ferromagnetic wedge
    • Hole or Slit
    • Cooling hole

Rotor D-Axis location

The rotor d-axis location is characterized by the saliency topology.

Here is the below representation of the rotor and stator phase relative position.

The relative angular position between the axis of the stator phase 1 (reference phase) and the rotor D-axis position must be controlled to perform the tests.

The winding axis of the reference phase is defined from the phase shift of the first electrical harmonic of the magneto motive force (M.M.F.).

This allows us to define the working point of the machine.

Figure 1. Definition of rotor initial position – Rules for direction


Figure 2. Example of the rotor d-axis location: d-Axis = 0 degree


The rotor d-axis location is an output parameter (read only data) of saliency parts. It completes the description of the topology, and it is automatically used to define the relative position between the axis of the stator phase 1 (reference phase) and the rotor D-axis position for performing the tests when needed.

Figure 3. Example of the rotor d-axis location: d-Axis = 45 degrees (if the rotor yoke, in black, is built with ferromagnetic material)