Abstract
AbstractRecently, adjustable speed hydroelectric power systems have been developed. In those power systems, ac exciting synchronous generators are used instead of the ordinary salient‐pole‐type synchronous machines. However, some higher harmonic sequences are included in the distribution of air‐gap magnetic flux density and in the terminal voltage waveform of the ac exciting synchronous machines because these machines have open winding slots. To develop better machines without terminal voltage waveform distortions, an evaluation method of the terminal voltage harmonics has been needed.This paper describes the mechanism of higher harmonics generation qualitatively and proposes an analytical method of no‐load terminal voltage waveforms on the basis of two‐dimensional magnetic field analysis considering movement of the rotor for quantitative higher harmonics analysis. The analytical results of higher harmonics show good agreement with the experimental ones.
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