Power generating apparatus

A power generating apparatus comprising:

• a stator including an armature core and polyphase output winding wound across said armature core;
• a plurality of rotors disposed inside said armature core and mounted on a rotary shaft, said rotors establishing first and second field magnetic circuits arranged in parallel with respect to said armature core,
• said first field magnetic circuit for generating a permanent magnetic flux penetrating said armature core, and including a plurality of claw poles disposed opposite to each other and a plurality of permanent magnets held between said claw poles,
• said second field magnetic circuit being independent of said first field magnetic circuit and including a plurality of claw poles disposed opposite to each other and a field winding held between said claw poles, and
• a total area of said claw poles included in said first field magnetic circuit being substantially equal to the total area of said claw poles included in said second field magnetic circuit;
• and
• control means for controlling the voltage across the polyphase output winding;
• said control means operating in a first control mode to increase a voltage induced across said polyphase output winding by supplying a first current to said field winding which causes said second field magnetic circuit to generate a first magnetic flux, said first magnetic flux penetrating said armature core and having the same direction as said permanent magnetic flux;
• said control means operating in a second control mode to decrease the voltage induced across said polyphase output winding by supplying a second current to said field winding which causes said second field magnetic circuit to generate a second magnetic flux, said second magnetic flux penetrating said armature core and having a direction opposite that of said permanent magnetic flux.

A power generating apparatus comprising:

• a stator including an armature core and polyphase output winding wound around said armature core;
• a plurality of rotors disposed inside said armature core and mounted on a rotary shaft, said rotors establishing first and second field magnetic circuits arranged in parallel with respect to said armature core;
• said first field magnetic circuit for generating a permanent magnetic flux penetrating said armature core, and including a plurality of claw poles extruding from a cylindrical yoke and a plurality of claw shaped permanent magnets each arranged alternately with each of said claw poles, said claw shaped permanent magnets fixed on the outer circumferential surface of said cylindrical yoke,
• said second field magnetic circuit being independent of said first field magnetic circuit and including a plurality of claw poles disposed opposite to each other and a field winding held between said claw poles, and
• a total area of said claw poles and claw shaped permanent magnets in said first field magnetic circuit being substantially equal to a total area of said claw poles in said second field magnetic circuit;
• and
• control means for controlling the voltage across the polyphase output winding;
• said control means operating in a first control mode to increase a voltage induced across said polyphase output winding by supplying a first current to said field winding which causes said second field magnetic circuit to generate a fist magnetic flux, said first magnetic flux penetrating said armature core and having the same direction as said permanent magnetic flux;
• said control means operating in a second control mode to decrease the voltage induced across said polyphase output winding by supplying a second current to said field winding which causes said second field magnetic circuit to generate a second magnetic flux, said second magnetic flux penetrating said armature core and having a direction opposite that of said permanent magnetic flux.