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A gas turbine engine, in particular a turboshaft engine, includes a spool having a turbine and a gas generator compressor mounted thereto, a source of heat positioned between the turbine and the compressor, a first shaft and a free turbine mounted to the first shaft, and a control system for transfe

A gas turbine engine, in particular a turboshaft engine, includes a spool having a turbine and a gas generator compressor mounted thereto, a source of heat positioned between the turbine and the compressor, a first shaft and a free turbine mounted to the first shaft, and a control system for transferring power between the spool and the shaft. The operating speed of the gas generator compressor is re-matched in order to improve the efficiency and surge margin of the gas generator compressor and to improve the transient performance of the gas turbine engine.

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What is claimed is: 1. A gas turbine engine comprising: a gas generator spool having a compressor and a first turbine mounted thereto; a power output shaft and a second turbine mounted to said power output shaft; said spool and said power output shaft being independently rotatable and rotating at d

What is claimed is: 1. A gas turbine engine comprising: a gas generator spool having a compressor and a first turbine mounted thereto; a power output shaft and a second turbine mounted to said power output shaft; said spool and said power output shaft being independently rotatable and rotating at different speeds; and electrical means for modifying the speed of said spool to achieve a balance between power absorbed by the compressor and power available from the first turbine, said electrical means including a first electrical machine having functionality as one of a motor and a generator mounted to the spool. 2. The gas turbine engine according to claim 1, wherein the electrical means comprises a second electrical machine having functionality as one of a motor and a generator mounted to the power output shaft. 3. The gas turbine engine according to claim 2, further comprising power electronic means for transferring electrical power between said first electrical machine and said second electrical machine to achieve re-matching of said compressor to higher speed and flow rate to increase a surge margin of the compressor. 4. The gas turbine engine according to claim 1, further comprising a load attached to said power output shaft. 5. The gas turbine engine according to claim 4, wherein said load is a helicopter rotor. 6. The gas turbine engine according to claim 1, wherein said power output shaft is operated at a constant speed. 7. The gas turbine engine according to claim 1, wherein said turbine mounted to said power output shaft comprises a free turbine. 8. A gas turbine engine comprising: a gas generator spool having a compressor and a first turbine mounted thereto; a power output shaft and a second turbine mounted to said power output shaft; said spool and said power output shaft being independently rotatable and rotating at different speeds; electrical means for modifying the speed of said spool to achieve a balance between power absorbed by the compressor and power available from the first turbine, wherein the electrical means comprises a first electrical machine mounted to the spool and a second electrical machine mounted to the power output shaft, and wherein said first electrical machine operates as a generator and said second electrical machine operates as a motor. 9. A gas turbine engine comprising: a gas generator spool having a compressor and a first turbine mounted thereto; a power output shaft and a second turbine mounted to said power output shaft; said spool and said power output shaft being independently rotatable and rotating at different speeds; electrical means for modifying the speed of said spool to achieve a balance between power absorbed by the compressor and power available from the first turbine, wherein the electrical means comprises a first electrical machine mounted to the spool and a second electrical machine mounted to the power output shaft, and wherein said first electrical machine operates as a motor and said second electrical machine operates as a generator. 10. A gas turbine engine comprising: a gas generator spool having a compressor and a first turbine mounted thereto; a power output shaft and a second turbine mounted to said power output shaft; said spool and said power output shaft being independently rotatable and rotating at different speeds; electrical means for modifying the speed of said spool to achieve a balance between power absorbed by the compressor and power available from the first turbine, wherein the electrical means comprises a first electrical machine mounted to the spool and a second electrical machine mounted to the power output shaft, power electronic means for transferring electrical power between said first electrical machine and said second electrical machine to achieve re-matching of said compressor to higher speed and flow rate to increase a surge margin of the compressor; and a control system for controlling operation of the first and second electrical machines and a FADEC connected to said control system. 11. A gas turbine engine comprising: a gas generator spool having a compressor and a first turbine mounted thereto; a power output shaft and a second turbine mounted to said power output shaft; said spool and said power output shaft being independently rotatable and rotating at different speeds; electrical means for modifying the speed of said spool to achieve a balance between power absorbed by the compressor and power available from the first turbine; and a free compressor for supercharging said compressor on said spool. 12. The gas turbine engine according to claim 11, further comprising a motor for driving said free compressor and said free compressor and said motor being connected to a third shaft. 13. A gas turbine engine comprising: a spool having a turbine and a compressor mounted thereto; a first shaft and a free turbine mounted to said first shaft; and means for transferring power between said spool and said first shaft: and said power transferring means comprising a first electrical machine attached to said spool, a second electrical machine attached to said first shaft, and means for transmitting electrical power between said first electrical machine and said second electrical machine. 14. The gas turbine engine according to claim 13, further comprising a source of heat positioned between said turbine and said compressor. 15. The gas turbine engine according to claim 14, wherein said source of heat comprises a combustor. 16. The gas turbine engine according to claim 13, further comprising means for controlling the transmission of said electrical power between said first electrical machine and said second electrical machine. 17. The gas turbine engine according to claim 16, further comprising a FADEC connected to said controlling means. 18. The gas turbine engine according to claim 13, wherein said first electrical machine comprises a motor/generator and said second electrical machine comprises a motor/generator. 19. The gas turbine engine according to claim 13, wherein said compressor attached to said spool comprises a variable geometry compressor. 20. The gas turbine engine according to claim 13, further comprising an additional spool having an additional compressor and an additional turbine. 21. The gas turbine engine according to claim 13, wherein said first shaft comprises a power output shaft for driving a load. 22. A gas turbine engine comprising: a spool having a turbine and a compressor mounted thereto; a first shaft and a free turbine mounted to said first shaft; means for transferring power between said spool and said first shaft; and a free compressor connected to a second shaft. 23. The gas turbine engine according to claim 22, wherein said free compressor is a variable geometry compressor. 24. The gas turbine engine according to claim 22, wherein said second shaft is positioned outside of said spool. 25. The gas turbine engine according to claim 22, wherein said power transferring means comprises a first electrical machine attached to said spool, a second electrical machine attached to said first shaft, a third electrical machine connected to said second shaft, and means for transmitting electrical power between said first electrical machine, said second electrical machine, and said third electrical machine. 26. The gas turbine engine according to claim 25, further comprising means for controlling the transmission of said electrical power between said first, second, and third electrical machines. 27. The gas turbine engine according to claim 26, further comprising a FADEC connected to said controlling means. 28. The gas turbine engine according to claim 25, wherein said first electrical machine comprises a motor/generator, said second electrical machine comprises a motor/generator, and said third electrical machine comprises a motor. 29. A gas turbine engine comprising: a spool having a turbine and a compressor mounted thereto; a first shaft and a free turbine mounted to said first shaft; means for transferring power between said spool and said first shaft; and said first shaft comprising a power output shaft for driving a load, wherein said load comprises a helicopter rotor. 30. The A gas turbine engine comprising: a spool having a turbine and a compressor mounted thereto; a first shaft and a free turbine mounted to said first shaft; means for transferring power between said spool and said first shaft; and a free compressor connected to a second shaft, wherein each of said compressors is a variable geometry compressor and further comprising means for controlling the geometry of each of said compressors and for controlling said power transferring means. 31. A turboshaft engine for use in an aircraft comprising: a power output shaft and a power turbine attached to said power output shaft; a spool surrounding a portion of said power output shaft; a gas generator compressor and a turbine attached to said spool; and a free compressor attached to a driven shaft. 32. The turboshaft engine according to claim 31, wherein each of said compressors has a variable geometry. 33. The turboshaft engine according to claim 32, further comprising an electric motor attached to said free compressor. 34. The turboshaft engine according to claim 33, further comprising a motor/generator attached to said spool. 35. The turboshaft engine according to claim 34, further comprising a motor/generator attached to said power output shaft. 36. The turboshaft engine according to claim 35, further comprising means for controlling the variable geometry of said compressors and for controlling said motor and said motor/generators. 37. The turboshaft engine according to claim 36, wherein said controlling means comprises means for transferring electrical power between said motor and said motor/generators. 38. The turboshaft engine according to claim 37, wherein said controlling means further comprises a FADEC connected to said electrical power transferring means.