04906060 is referenced by 57 patents and cites 13 patents.

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.

Title
Apparatus and method for controlling the output frequency of a wind-driven alternator
Application Number
7/327823
Publication Number
4906060
Application Date
March 23, 1989
Publication Date
March 6, 1990
Inventor
David L Claude
Justin
TX, US
Agent
Dennis T Griggs
Assignee
Twind Energy Corporation
NJ, US
IPC
H02P 9/00
H02K 29/00
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