초록 ▼

Method and apparatus for controlling the output frequency of an alternator by maintaining a relatively constant speed of rotation of the alternator rotor are disclosed. The rotor includes an annular stator and a rotor rotatably mounted within. In one embodiment the stator winding is comprised of a p

Method and apparatus for controlling the output frequency of an alternator by maintaining a relatively constant speed of rotation of the alternator rotor are disclosed. The rotor includes an annular stator and a rotor rotatably mounted within. In one embodiment the stator winding is comprised of a plurality of discrete polyphase windings positioned within discrete annular segments of the stator. When the actual rotor speed is below the desired speed, selected stator units are de-energized to decrease the strength of the stator magnetic field, thereby permitting the rotor speed to increase. When the actual rotor speed is greater than the desired speed, selected stator units are energized to increase the strength of the stator magnetic field, thereby exerting a braking force on the rotor to slow it down. In another embodiment each phase of the polyphase stator winding includes a plurality of inductor coils. Selected ones of the coils in each phase of the stator winding are selectively energized to decrease the rotor speed or de-energized to increase the rotor speed, as required to maintain the desired rotor speed for substantially constant frequency output.

대표청구항 ▼

An apparatus for controlling the output frequency of an electrical alternator, said alternator having a stator and a rotor rotatably mounted with respect to stator, said stator and said rotor having respective polyphase electrically conductive windings disposed thereon, said apparatus comprising: me

An apparatus for controlling the output frequency of an electrical alternator, said alternator having a stator and a rotor rotatably mounted with respect to stator, said stator and said rotor having respective polyphase electrically conductive windings disposed thereon, said apparatus comprising: means for measuring the rotational speed of said rotor and for generating a first electrical signal indicative thereof; means for generating a second electrical signal representing a desired rotor speed corresponding to a desired output frequency of said alternator; means for comparing said first and second electrical signals and for generating a third electrical signal when actual rotor speed is greater than the desired rotor speed and for generating a fourth electrical signal when actual rotor speed is less than the desired rotor speed; and, control means responsive to said third electrical signal for enabling selected portions of said stator winding, thereby increasing the strength of the stator magnetic field to decrease the rotational speed of the rotor, said control means being responsive to said fourth electrical signal for disabling selected portions of said stator winding, thereby decreasing the strength of the stator magnetic field to increase the rotational speed of the rotor.