Distribution of leakage flux at the stator core back of the synchronous machine

Mariotoni, Carlos Alberto (1981) Distribution of leakage flux at the stator core back of the synchronous machine. University of Southampton, Doctoral Thesis, 285pp.

Record type: Thesis (Doctoral)

Abstract

The importance of the leakage flux at the stator core back to the reliability of the synchronous machine has been increased with the constant growth in the machine size. The distribution of core back leakage flux is investigated during different operational conditions such as short and open circuits, and on-load. The radial, axial and circumferential components of leakage flux are measured at the air region of the stator core back. Those components help to estimate the leakage flux inside the stator core back and can be used to determine the effects of the leakage flux on the stator core structure.

The core back leakage flux can induce circulating currents which can damage the stator core. The distribution of this leakage flux depends on a large number of variables. The most important of them, which are discussed in this thesis, are: the levels of saturation in the stator core, the odd harmonics in the leakage flux waveform, the distribution of eddy currents, the overhang geometry and current, the power factor, and the geometry of the stator core and its mechanical structure.

The method of the electromagnetic sources is utilised in order to analyse the distribution of the leakage flux at the stator core back of the synchronous machine. The mathematical treatment of the electromagnetic sources is also presented.

Text

Mariotoni 1981 Thesis - Version of Record

Available under License University of Southampton Thesis Licence.

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