Comparative Evaluation Of Connection Schemes Of Synchronous Generator Windings As Part Of Dc Sources

Abstract

The article discusses the scheme of DC sources based on a multiphase synchronous generator with excitation from permanent magnets and a rectifier. The estimation of various variants of construction of schemes at change of number of phases from two to ten and ways of connection of winding of the generator is carried out: N-ray star or the closed ring from N sections. It is proved that, other things being equal, the specific electric losses of the winding with a small number of phases, from two to four, are preferable to multiphase windings. The advantages of closed multiphase windings over open windings are shown, both from the point of view of specific electric losses and from the point of view of maintaining output characteristics in case of single failures. With the help of mathematical models the analysis of pulsations of output voltage of rectifier for different number of phases and different schemes of connection of windings, both in normal mode, and at breakage of diodes in rectifier is carried out. The influence of the inductance of the generator winding on the value of voltage pulsations is estimated. The conclusion is made about the significant advantage of closed windings over open from the point of view of ripples of the rectified voltage.