Alternating current generator with direct connected exciter winding

A field exciter unit for coupling a multi-phase AC power winding of a multi-phase alternating current generator to a relatively rotating DC field winding of said generator, each phase of said AC power winding having a first coil unit and a second coil unit adapted to be connected between first and second output terminals and in series for a high voltage output and in parallel for a low voltage output, comprising an AC exciter multi-phase winding with each exciter phase winding having a series winding including a first coil and a second coil, said first coil of said exciter winding being connected in series with said first coil unit of said power winding between an output terminal and said power winding, said power winding having the opposite side connected to an interconnection terminal, said second coil of said excitation winding being connected in series between said second coil unit of said coil unit and an interconnection terminal, said low voltage side of said second power winding connected to the low voltage output terminal of said generator, said exciter including a multi-phase shunt winding with each phase shunt winding connected across said second coil unit at the same phase, said circuit being constructed for a single voltage operation with a relatively high potential to neutral or ground voltage on the excitation winding, said circuit requiring a single interconnection line from each of said exciter phase winding to said generator power winding.

An alternating current polyphase generator, comprising a rotating direct current field winding, an AC power windings, a rotating exciter for exciting said DC field winding, said AC power winding including a plurality of phase windings, each phase winding including a first main winding and a second main winding adapted to be connected in series to establish a high voltage output and adapted to be connected in parallel to establish a low voltage output, said rotating exciter including a multiple phase stator winding having a plurality of AC phase windings corresponding to the phase windings of said AC power winding and each exciter phase winding having a shunt winding coupled to said main winding for establishing an excitation current output, said exciter having a multi-phase rotor winding connected to said multi-phase stator winding and having a rectifier unit connected to said rotor winding and having an output connection connected to said direct current field winding of said generator, each phase winding of said exciter stator winding including a shunt winding and a series winding, each said series winding including a first coil and a second coil, said first coil being connected in series with said shunt winding to an interconnection terminal and to the high potential side of said first main winding, said second coil of said excitation winding connected between the high potential side of said second main winding and an interconnection terminal, said interconnection terminals being selectively connected to each other and to said main power output terminals to respectively establish a high voltage connection and a low voltage connection.

A field excitation circuit for coupling the AC power windings of an alternating current generator to a relatively rotating DC field winding of said generator, comprising a rotating exciter having an AC primary winding including a shunt winding and a series winding, said AC power windings each having first and second main windings series connected between first and second output terminals, said first main winding having a first output lead connected to said first output terminal and having a second output lead, said second main winding having a first output lead connected to said second output terminal and having a second output lead, said second output leads being selectively connected whereby said windings can be connected in series for a high voltage output and in parallel for a low voltage output, said exciter series winding having first and second coils, said first coil connected to said second output lead of said first main winding and having a first interconnection terminal for connecting of said first coil in series circuit with said first main winding, said second series coil of said exciter winding connected to said second output lead of said second main winding and having a second interconnection terminal, said exciter shunt winding connected to said second output lead of said second main winding, whereby said interconnection terminals are connected to each other for series connection of said main winding and said exciter winding in an alternating current conducting circuit for a high voltage connection and whereby said main windings in series with said exciter coil are connected in parallel with each other between said first output terminal and said second output terminal in an alternating current conductor path for a low voltage connection and thereby establishing and maintaining a balance circuit condition regardless of the size of the generator.