When the rotor shaft is driven by prime mover, the residual flux within rotor core is crossed to
armature winding at stator part. So, the little induced voltage is induced in armature winding and also
charged to the capacitor too. The little voltage in capacitor is built the new flux and it is added to the old
residual flux that effort to the flux in the machine are increased, and also finally the voltage of induction
generator is gradually increased as shown in Fig. 5 (b). Besides that the size of capacitance is effort to the
building-up voltage of generator, especially if the capacitance is too small as shown in Fig. 5 (c).