Abstract
The characteristics improvements of salient-pole synchronous generators by inserting additional permanent magnets are investigated from both results of finite element analyses and experiments. First, the assist effects of the magnets in a MVA-class generator are analyzed by the finite element method. Next, the characteristics improvements are validated by the experiment of a small prototype generator. It is revealed that there are two kinds of the assist effects by the additional magnets in the salient-pole synchronous generators. One is the reduction of the magnetic saturation in the rotor-pole bodies. The other is the direct flux linkage of the armature windings from the permanent magnets. The variations in these effects with the load conditions are also clarified.
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