Description & Operation

Metro & Firefly (Canadian) are equipped with a Mitsubishi 55-amp generator with internal voltage regulator. The Integrated Circuit (IC) voltage regulator is a solid state unit mounted to rectifier end frame. Brushes carry current through 2 slip rings to field coil mounted on rotor. A rectifier bridge containing 4 active diodes is connected to stator windings. Two neutral diodes are used to smooth out voltage fluctuations caused by varying generator speeds. A capacitor (condenser), mounted in regulator, protects the rectifier bridge and neutral diodes. This capacitor also suppresses radio interference noise.