Abstract
This paper presents two definitions of a saturated salient-pole synchronous machine turn ratio between the d-axis and the field circuit, which can clarify the physical relationship between the leakage reactances and the leakage flux.
The definitions are derived from two-dimensional finite elements and based on an assumption that the total leakage flux of the machine consists of the armature leakage component which flows only in the stator, the field leakage component which flows only in the rotor and the gap leakage component which flows across the gap and stems from the difference in the space distribution between d-axis and field winding. The values of the two defined turn ratios vary according to the magnetic saturation. One definition is based on the first order harmonics of the gap flux density space distribution. It clarifies the relationship between the armature leakage reactance and the armature leakage component of the leakage flux. The other definition is based on the amount of gap flux. It clarifies the relationship between the field leakage reactance and the field leakage component of the leakage flux.
The results of reactance analyses show the validity of these two definitions.
