Calculation of leakage inductances of a salient-pole synchronous machine using finite elements

An analysis method for calculating three components of leakage inductances, i.e. the stator, rotor and winding distribution differential leakage inductances, which properly represent the amount of each leakage flux in a salient-pole synchronous machine is presented. The winding distribution differential leakage inductance has a positive value mainly arising from the difference between the armature and field winding distributions. The value of the turns ratio must be changed as the saturation condition changes in order to transform leakage inductances into the proper armature base values. Calculated leakage inductances are shown to validate the method. Further investigations using the presented analysis may generate useful knowledge for pole designs.