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A rotating electrical machine, such as an aircraft starter-generator, that may be operated in either a DC motor mode or an AC generator mode. The machine includes a main stator that is selectively configurable as a multi-pole AC stator and a multi-pole DC stator. The machine also includes DC brushes

A rotating electrical machine, such as an aircraft starter-generator, that may be operated in either a DC motor mode or an AC generator mode. The machine includes a main stator that is selectively configurable as a multi-pole AC stator and a multi-pole DC stator. The machine also includes DC brushes that are selectively moveable into, and out of, electrical contact the main rotor, to thereby electrically couple and decouple a DC power source to and from, respectively, the rotor windings.

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We claim: 1. A gas turbine engine starter-generator, comprising: a housing; a main rotor rotationally mounted within the housing; a main stator mounted within the housing and located at least partially around at least a portion of the main rotor, the main stator selectively configurable as an M-pol

We claim: 1. A gas turbine engine starter-generator, comprising: a housing; a main rotor rotationally mounted within the housing; a main stator mounted within the housing and located at least partially around at least a portion of the main rotor, the main stator selectively configurable as an M-pole AC stator or an N-pole DC stator; and a control circuit electrically coupled to at least the main stator and operable to selectively configure the main stator as the M-pole AC stator or the N-pole DC stator. 2. The starter-generator of claim 1, further comprising: a plurality of windings wound on at least a portion of the main stator; and a plurality of switches electrically coupled between selected ones of the main stator windings, each of the switches having at least a first position and a second position, wherein the main stator is configured as the M-pole AC stator with the plurality of switches in the first position, and is configured as the N-pole DC stator with plurality of switches in the second position. 3. The starter-generator of claim 2, wherein the control circuit comprises: switch control circuitry operable to move the plurality of switches between at least the first position and the second position. 4. The starter-generator of claim 1, further comprising: a plurality of main rotor windings wound on at least a portion of the main rotor, each of the main rotor windings adapted to selectively electrically couple to a DC power source. 5. The starter-generator of claim 4, further comprising: at least two brushes adapted to electrically couple to the DC power source and selectively moveable into, and out of, electrical contact with at least a portion of the main rotor, whereby the brushes are electrically coupled to, and decoupled from, respectively, the main rotor windings. 6. The starter-generator of claim 4, further comprising: an exciter rotor mounted on the shaft; an exciter stator having a plurality of windings wound thereon, the exciter stator mounted within the housing and located at least partially around at least a portion of the exciter rotor; and at least one rectifier assembly electrically coupled in series between the exciter stator windings and the main rotor windings. 7. The starter generator of claim 1, further comprising: a DC power source electrically coupled in series with the main stator when the main stator is configured as an N-pole DC stator. 8. The starter-generator of claim 1, wherein M is unequal to N. 9. The starter-generator of claim 8, wherein N=(M/2). 10. A gas turbine engine starter-generator, comprising: a housing; a rotor rotationally mounted within the housing; a stator mounted within the housing and located at least partially around at least a portion of the rotor, the stator selectively configurable as an M-pole AC stator or an N-pole DC stator; a plurality of rotor windings wound on at least a portion of the main rotor; and at least two brushes adapted to electrically couple to a DC power source and selectively moveable into, and out of, electrical contact with at least a portion of the main rotor, whereby the brushes are electrically coupled to, and decoupled from, respectively, the rotor windings; and a control circuit electrically coupled to at least the main stator and operable to selectively configure the main stator as the M-pole AC stator or the N-pole DC stator. 11. The starter-generator of claim 10, further comprising: a plurality of windings wound on at least a portion of the main stator; and a plurality of switches electrically coupled between selected ones of the main stator windings, each of the switches having at least a first position and a second position, wherein the main stator is configured as the M-pole AC stator with the plurality of switches in the first position, and is configured as the N-pole DC stator with the plurality of switches in the second position. 12. The starter-generator of claim 11, wherein the control circuit comprises: switch control circuitry operable to move the plurality of switches between at least the first position and the second position. 13. The starter-generator of claim 10, further comprising: an exciter rotor mounted on the shaft; an exciter stator having a plurality of windings wound thereon, the exciter stator mounted within the housing and located at least partially around at least a portion of the exciter rotor; and at least one rectifier assembly selectively electrically coupled in series between the exciter stator windings and the main rotor windings. 14. The starter generator of claim 10, further comprising: a DC power source electrically coupled in series with the main stator when the main stator is configured as the N-pole DC stator. 15. The starter-generator of claim 10, wherein M is unequal to N. 16. The starter-generator of claim 15, wherein N=(M/2). 17. A gas turbine engine staffer-generator, comprising: a housing; a shaft rotationally mounted within the housing; a main rotor mounted on the shaft; a main stator mounted within the housing and located at least partially around at least a portion of the main rotor; a plurality of main stator windings wound around at least a portion of the main stator; a plurality of switches electrically coupled between selected ones of the main stator windings, each of the switches having at least a first position and a second position; and a control circuit operable to selectively move the plurality of switches between the first and second positions, wherein the switches, when in the first position, electrically couple the main stator windings such that the main stator is configured as an M-pole AC stator and, when in the second position, electrically couple the main stator windings such that the main stator is configured as an N-pole DC stator. 18. The starter-generator of claim 17, wherein the control circuit includes: switch control circuitry operable to selectively move the plurality of switches between the first and second positions. 19. The starter-generator of claim 17, further comprising: a plurality of main rotor windings wound on at least a portion of the main rotor, each of the main rotor windings adapted to selectively electrically couple to a DC power source. 20. The starter-generator of claim 19, further comprising: at least two brushes adapted to electrically couple to the DC power source and selectively moveable into, and out of, electrical contact with at least a portion of the main rotor, whereby the brushes are electrically coupled to, and decoupled from, respectively, the main rotor windings. 21. The starter-generator of claim 19, further comprising: an exciter rotor mounted on the shaft; an exciter stator having a plurality of windings wound thereon, the exciter stator mounted within the housing and located at least partially around at least a portion of the exciter rotor; and at least one rectifier assembly electrically coupled in series between the exciter stator windings and the main rotor windings. 22. The starter generator of claim 18, further comprising: a DC power source electrically coupled in series with the main stator when the main stator is configured as an N-pole DC stator. 23. The starter-generator of claim 17, wherein M is unequal to N. 24. The starter-generator of claim 23, wherein N=(M/2). 25. A stator, comprising: a main stator body; and a plurality of stator coils wound around at least a portion of the main body, wherein the stator coils are wound in a configuration that allows the stator to be selectively configured as an M-pole AC stator or an N-pole DC stator; and a plurality of switches electrically coupled between selected ones of the stator coils, each of the switches having at least a first position and a second position. 26. The stator of claim 25, wherein the stator is configured as the M-pole AC stator with the switches in the first position, and is configured as the N-pole DC stator with the switches in the second position. 27. The stator of claim 25, wherein M is unequal to N. 28. The stator of claim 27, wherein N=(M/2). 29. In a motor/generator including a stator having a plurality of stator windings wound around at least a portion thereof, a method of operating the motor/generator, comprising: electrically coupling at least a portion of the stator windings together such that the main stator is configured as an N-pole DC stator and supplying DC power to the electrically coupled stator windings, to thereby operate the motor/generator as a DC motor; and electrically coupling at least a portion of the stator windings together such that the main stator is configured as an M-pole AC stator and no longer supplying DC power thereto, to thereby operate the motor/generator as an AC generator, wherein the motor/generator changes from operation as a DC motor to an AC generator when its rotational speed reaches a predetermined magnitude. 30. The method of claim 29, wherein the motor/generator further includes a rotationally mounted rotor having a plurality of rotor windings wound around at least a portion thereof, and at least two brushes that are selectively electrically coupled to, and decoupled from, the rotor windings, the method further comprising: electrically coupling the brushes to the rotor windings when operating the motor/generator as a DC motor; and electrically decoupling the brushes from the from rotor windings when operating the motor/generator as an AC generator. 31. In a motor/generator including a stator having a plurality of stator windings wound around at least a portion thereof, a method of operating the motor/generator, comprising: electrically coupling at least a portion of the stator windings together such that the main stator is configured as an N-pole DC stator and supplying DC power to the electrically coupled stator windings, to thereby operate the motor/generator as a DC motor; and electrically coupling at least a portion of the stator windings together such that the main stator is configured as an M-pole AC stator and no longer supplying DC power thereto, to thereby operate the motor/generator as an AC generator, wherein the motor/generator changes from operation as a DC motor to an AC generator a predetermined time after commencing operation as a DC motor.