The assist effects of the permanent magnets in salient-pole synchronous generators are investigated by the electromagnetic field analysis. The flux and voltage are separated by the finite element analyses due to their origins. The measured and calculated results are compared in order to verify the calculation. It is revealed that there are two assist effects of the magnets on the improvement of the generator characteristics. One effect is the reduction in the size of the saturated region at the rotor core. The other effect is the direct flux linkage with the armature windings. The former effect is dominant at the rated load condition. The latter effect increases when the rotor core is oversaturated and compensates for the decrease in the former effect.
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