Finite element calculation leakage inductances of a saturated salient-pole synchronous machine with damper circuits

Summary form only given. It is important to understand the relationship between leakage flux distributions and machine characteristics for better design of synchronous machines. This paper presents a calculation method for leakage inductances of saturated salient-pole machines with damper circuits. The whole leakage inductances are divided into the self-leakage, gap leakage and winding-differential leakage inductances. The leakage inductances correspond directly to the leakage flux distributions in the machines. Cross-magnetizing inductances are also calculated. The method is applied to a 300 MVA class generator. The relationship between the winding distributions, flux distributions, saturation and inductances is discussed. Weak magnetic influence of the damper circuits on the armature in the d-axis is quantitatively illustrated through values of the winding-differential leakage inductances. The cross-magnetizing inductances except for the d-axis damper circuits are relatively large. Variations of the armature self-leakage inductances with saturation are small, and variation of the field and damper self-leakage inductances are larger.