Hi Group,
I have an 18hp 8 or 10 KW portable home generator, circa 1990, brand unknown with open diodes in the rotor windings.
This is a brush-less self exciting set using an exciter stator/ capacitor for regulation.
The field rotor has four winding's on two bobbins, the winding's are in series and at each junction is a diode.
The diodes connect to a plate on the rotor shaft.
I am not sure of the polarity pof the diode arrangement.
?
I am also not sure of the diode ratings.
?
I have researched this in depth and cannot find any info on a four coil arrangement, everything I read is three phase windings.
Any help with the diode selection (common cathode/common anode) and EI ratings appreciated. I was guessing a Vishay VS series 10 or 20 amps at 1200 volt in a DO-203AA (DO-4) package.
If anyone can reference literature on this rotor arrangement I would be much appreciated as I would like to understand how this ckt operates in terms of current flow etc.....
Many Thanks