초록 ▼

A starter-generator system is configured to be operable at multiple variable frequencies. The starter-generator includes a rotor and a stator. The rotor is configured to rotate and has a single main field winding wound thereon. The stator has at least a first stator winding set and second stator win

A starter-generator system is configured to be operable at multiple variable frequencies. The starter-generator includes a rotor and a stator. The rotor is configured to rotate and has a single main field winding wound thereon. The stator has at least a first stator winding set and second stator winding set independently wound thereon. Upon electrical excitation and rotation of the rotor the starter-generator supplies electrical power from each of the stator winding sets at different frequencies. Also, upon electrically exciting one or both of the stator winding sets with appropriate AC power, the rotor will rotate and generate a starting torque.

대표청구항 ▼

We claim: 1. A starter-generator, comprising: a rotor configured to rotate and having a single main field winding wound thereon that, upon electrical excitation thereof, generates an electromagnetic flux; and a stator disposed at least partially around at least a portion of the rotor and having at

We claim: 1. A starter-generator, comprising: a rotor configured to rotate and having a single main field winding wound thereon that, upon electrical excitation thereof, generates an electromagnetic flux; and a stator disposed at least partially around at least a portion of the rotor and having at least a first stator winding set and second stator winding set independently wound thereon, the first stator winding set configured to implement a first number of stator poles and, upon receipt of the electromagnetic flux, to have AC currents induced therein at a first frequency, the second stator winding set configured to implement a second number of stator poles and, upon receipt of the electromagnetic flux, to have AC currents induced therein at a second frequency, wherein the first and second number of stator poles are unequal and the first and second frequencies are unequal. 2. The starter-generator of claim 1, wherein: the main field winding is wound on the rotor such that, upon electrical excitation thereof, the main field winding generates a first electromagnetic flux pattern of a first number of rotor poles and a second electromagnetic flux pattern of a second number of rotor poles; and the first and second number of rotor poles are unequal. 3. The starter-generator of claim 2, wherein: the first number of stator poles and the first number of rotor poles are equal; and the second number of stator poles and the second number of rotor poles are equal. 4. The starter-generator of claim 1, wherein: the main field winding comprises a plurality of rotor coils electrically coupled in series; each rotor coil comprises a number of turns and is electrically coupled in series with at least one other rotor coil; and the number of turns of each rotor coil is unequal to the number of turns of the at least one other rotor coil. 5. The starter-generator of claim 1, further comprising: a control unit coupled to receive one or more signals representative of electrical power supplied by one or both of the first and second sets of stator windings and operable, in response thereto, to control the electrical excitation of the main field winding. 6. The starter-generator of claim 5, further comprising: an exciter rotor having a set of exciter armature windings wound thereon; an exciter stator disposed at least partially around at least a portion of the exciter rotor and having an exciter field winding wound thereon, the exciter field winding coupled to the control unit; and one or more rectifier assemblies electrically coupled in series between the exciter armature windings and the single main field winding. 7. The starter-generator of claim 6, wherein the control unit, in response to one or more signals representative of electrical power supplied by one or both of the first and second sets of stator windings, controls electrical excitation of the exciter field winding, to thereby control the electrical excitation of the single main field winding. 8. The starter-generator of claim 5, wherein: the first and second sets of stator windings are each configured to supply an amount of electrical power; and the control unit is coupled to receive the one or more signals representative of supplied electrical power from that set of stator windings that is supplying a greater amount of electrical power. 9. The starter-generator of claim 5, wherein: the first and second sets of stator windings supply electrical power in accordance with first and second load profiles, respectively; and the control unit is coupled to receive the one or more signals representative of supplied electrical power from both the first and second sets of stator windings. 10. The starter-generator of claim 1, wherein: the first stator winding set is further configured, upon being electrically excited with AC power of a first frequency, to generate a magnetic field that rotates at a first speed; the second stator winding set is further configured, upon being electrically excited with AC power of a second frequency, to generate a magnetic field that rotates at a second speed; the single main field winding is further configured to electromagnetically interact with one or more of the rotating magnetic fields, to thereby generate a torque and cause the rotor rotate; and the first and second number of stator poles are unequal and the first and second frequencies are unequal. 11. The starter-generator of claim 1, wherein the rotor is a cylindrical rotor. 12. The starter-generator of claim 1, wherein the rotor is a salient pole rotor. 13. A starter-generator, comprising: a stator having at least a first stator winding set and second stator winding set independently wound thereon, the first stator winding set configured to implement a first number of stator poles and, upon electrical excitation thereof with AC power of a first frequency, to generate a magnetic field that rotates at a first speed, the second stator winding set configured to implement a second number of stator poles and, upon electrical excitation thereof with AC power of a second frequency, to generate a magnetic field that rotates at a second speed; and a rotor disposed at least partially within at least a portion of the stator and configured to rotate, the rotor having a single main field winding wound thereon that electromagnetically interacts with one or more of rotating the magnetic fields, to thereby generate a torque and rotate, wherein the first and second number of stator poles are unequal and the first and second frequencies are unequal. 14. The starter-generator of claim 13, wherein: the single main field winding is further configured, upon electrical excitation thereof, to generate an electromagnetic flux; the first stator winding set is further configured, upon receipt of the electromagnetic flux, to have AC currents induced therein at a first frequency; the second stator winding set is configured, upon receipt of the electromagnetic flux, to have AC currents induced therein at a second frequency; and the first and second frequencies are unequal. 15. The starter-generator of claim 13, wherein: the main field winding is wound on the rotor such that, upon electrical excitation thereof, the main field winding generates a first electromagnetic flux pattern of a first number of rotor poles and a second electromagnetic flux pattern of a second number of rotor poles; and the first and second number of rotor poles are unequal. 16. The starter-generator of claim 15, wherein: the first number of stator poles and the first number of rotor poles are equal; and the second number of stator poles and the second number of rotor poles are equal. 17. The starter-generator of claim 13, wherein: the main field winding comprises a plurality of rotor coils electrically coupled in series; each rotor coil comprises a number of turns and is electrically coupled in series with at least one other rotor coil; and the number of turns of each rotor coil is unequal to the number of turns of the at least one other rotor coil. 18. A starter-generator, comprising: a rotor configured to rotate and having a single main field winding wound thereon; and a stator having at least a first stator winding set and second stator winding set independently wound thereon, the first stator winding set configured to implement a first number of stator poles, the second stator winding set configured to implement a second number of stator poles, wherein: the single main field winding (i) upon electrical excitation thereof, generates an electromagnetic flux, and (ii) upon electromagnetic interaction with one or more rotating magnetic fields, generates a torque and causes the rotor to rotate, the first stator winding set is configured such that (i) upon receipt of the electromagnetic flux generated by the single main field winding, AC currents are induced therein at a first frequency, and (ii) upon electrical excitation thereof with AC power of a first frequency, a magnetic field that rotates at a first speed is generated thereby and interacts with the single main field winding, the second stator winding set is configured such that (i) upon receipt of the electromagnetic flux generated by the single main field winding, AC currents are induced therein at a second frequency, and (ii) upon electrical excitation thereof with AC power of a second frequency, a magnetic field that rotates at a second speed is generated thereby and interacts with the single main field winding, the first and second number of stator poles are unequal, and the first and second frequencies are unequal. 19. The starter-generator of claim 18, wherein: the main field winding is wound on the rotor such that, upon electrical excitation thereof, the main field winding generates a first electromagnetic flux pattern of a first number of rotor poles and a second electromagnetic flux pattern of a second number of rotor poles; and the first and second number of rotor poles are unequal. 20. The starter-generator of claim 19, wherein: the first number of stator poles and the first number of rotor poles are equal; and the second number of stator poles and the second number of rotor poles are equal.