IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0615627
(2006-12-22)
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등록번호 |
US-7791235
(2010-09-27)
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발명자
/ 주소 |
- Kern, John M.
- De Bedout, Juan M.
- Chung, Kiyoung
- Waszak, Michal-Wolfgang
- Shah, Manoj Ramprasad
- Toot, Peter D.
- Qu, Ronghai
- Wu, Wei
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출원인 / 주소 |
|
대리인 / 주소 |
McNees Wallace & Nurick, LLC
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인용정보 |
피인용 횟수 :
17 인용 특허 :
13 |
초록
▼
A system for transferring torque between a pair of independently, concurrently rotating shafts of a turbofan engine includes a magnetic gearbox. The magnetic gearbox has a first ring structure, a second ring structure and an intermediate ring structure. Each ring structure has an annular aperture th
A system for transferring torque between a pair of independently, concurrently rotating shafts of a turbofan engine includes a magnetic gearbox. The magnetic gearbox has a first ring structure, a second ring structure and an intermediate ring structure. Each ring structure has an annular aperture therethrough and a plurality of permanent magnets embedded therein. The intermediate ring structure is disposed between the first and the second ring structures. Each ring structure is coaxially concentric with, and independently rotatable with respect to the remaining ring structures. The first and second ring structures are each coupled to separate ones of the rotating engine shafts, and the intermediate ring is operable to transfer torque between the pair of shafts. Preferably, the intermediate ring structure is coupled to a rotating machine. The rotating machine has a controller, and is operable for adjusting a ratio of torque transferred between the pair of shafts.
대표청구항
▼
The invention claimed is: 1. A system for transferring torque between a pair of independently, concurrently rotating shafts of an engine, the system comprising: a magnetic gearbox, the magnetic gearbox including a first ring structure, a second ring structure and an intermediate ring structure, eac
The invention claimed is: 1. A system for transferring torque between a pair of independently, concurrently rotating shafts of an engine, the system comprising: a magnetic gearbox, the magnetic gearbox including a first ring structure, a second ring structure and an intermediate ring structure, each of the first, second and intermediate ring structure having an annular aperture therethrough and a plurality of magnetic pole pieces embedded therein, the intermediate ring structure disposed between the first ring structure and the second ring structure, each of the first, second and intermediate ring structure being coaxially disposed, concentric with, and independently rotatable with respect to the remaining ring structures; the first and second ring structures each being coupled to separate ones of the rotating engine shafts, and the intermediate ring structure cooperates with the first ring structure and second ring structure and determines the level of torque transferred between the pair of shafts. 2. The system as set forth in claim 1, wherein the intermediate ring structure being coupled to a rotating machine, and the rotating machine having a controller, the rotating machine operable for adjusting a level of torque transferred between the pair of shafts. 3. The system set forth in claim 2, wherein the rotating machine is a motor/generator configured to receive power from and to supply power to the intermediate ring structure in response to a signal generated by the controller, such that the torque is transferred variably between the pair of rotating shafts. 4. The system set forth in claim 2, wherein the rotating machine includes a rotor portion and a third annular ring structure having a plurality of permanent magnets embedded therein, the rotor portion including an output shaft and configured to move bi-directionally along an axis of the rotating machine to magnetically couple the rotor within the third ring, the third annular ring being drivingly coupled to one of the independently rotating engine shafts to induce an electromagnetic field in the rotor portion to selectively control an output torque of an output shaft, and the output shaft of the rotor being coupled to one of the first, intermediate or second ring structure. 5. The system set forth in claim 4, wherein the rotor portion is a squirrel-cage-type induction rotor. 6. The system of claim 2, wherein the first, second and intermediate ring structures having angular velocities ωp, ωs and ωr, related by the equation: ωc(1−i0)=ωs−(i0)(ωr) where the ratio i0=zr/zs, and zr/zs is a ratio defined by the number of permanent magnets in the first ring structure on an outer planetary ring of the magnetic gearbox, relative to the number of permanent magnets in the second ring structure. 7. The system of claim 6, wherein torques Ts, Tc and Tr correspond to the first ring structure, the second ring structure, and the intermediate ring structure, and apply torque to the first, second and intermediate ring structures according to the equation: Tsωs+Tcωc+Trωr=0. 8. The system set forth in claim 1, wherein the magnetic gearbox comprise a fully passive magnetic equivalent of a mechanical epicyclic planetary gearbox. 9. The system set forth in claim 1, wherein the magnetic gear box pullout torque allows the first and second and intermediate ring structures to slip in response to an excessive applied torque, to prevent mechanical damage to the magnetic gear box. 10. The system of claim 1, wherein the engine is a turbofan aircraft engine having a high pressure turbine coupled to the first shaft, and a low pressure turbine coupled to the second shaft. 11. The system of claim 1, wherein the intermediate ring structure is split into first and second magnetic ring portions, the first and second magnetic ring portions being controllable to advance and retard a phasing of magnetic fields induced in the respective first and second magnetic ring portions for selectively coupling and decoupling the intermediate ring, and adjusting the degree of magnetic coupling between the inner ring structure and the outer ring structure. 12. The system of claim 11, wherein the first and second magnetic ring portions are mounted on a common keyed shaft, and a control means is configured to adjust the relative phase between respective magnetic fields generated by the first and second ring portions. 13. The system of claim 11, wherein the first and second magnetic ring portions are formed in an integrated magnet ring portion having interleaved magnet portions and an external phase control for the respective first and second ring portion magnetic fields. 14. The system of claim 1, wherein the intermediate ring structure is configured to free-wheel such that no coupling is provided between the two shafts. 15. The system of claim 1, wherein the rotating machine is selected from the group consisting of: continuously-variable mechanical transmissions, infinitely-variable mechanical transmissions, hydraulic transmissions, motor-generator combinations, and combinations thereof. 16. A gas turbine engine comprising: a low pressure turbine spool and a high pressure turbine spool, at least one compression stage, a combustion chamber, an exhaust system and a rotary fan blade arrangement, the low pressure turbine spool and the high pressure turbine spool being magnetically coupled through a magnetic gearbox; the magnetic gearbox including: a first ring structure, a second ring structure and an intermediate ring structure, each of the first, second and intermediate ring structure having an annular aperture therethrough and a plurality of magnetic pole pieces embedded therein, the intermediate ring structure disposed between the first ring structure and the second ring structure, each of the first, second and intermediate ring structure being coaxially disposed, concentric with, and independently rotatable with respect to the remaining ring structures; the first and second ring structures each being coupled to one of the HP turbine spool and the LP turbine spool, and the intermediate ring co-operable to transfer torque between the HP turbine spool and the LP turbine spool. 17. The gas turbine engine of claim 16, wherein the intermediate ring structure being coupled to a rotating machine, and the rotating machine having a controller, the rotating machine operable for adjusting a ratio of power transferred between the HP turbine spool and the LP turbine spool. 18. The gas turbine engine of claim 17, wherein the rotating machine is a motor/generator configured to receive power from and to supply power to the intermediate ring structure in response to a signal generated by the controller, such that the torque is distributed variably between the pair of rotating shafts. 19. The gas turbine engine of claim 17, wherein the rotating machine includes a rotor portion and a third annular ring structure having a plurality of permanent magnets embedded therein, the rotor portion including an output shaft and configured to move bi-directionally along an axis of the rotating machine to magnetically couple the rotor within the third ring, the third annular ring being drivingly coupled to one of the independently rotating engine shafts to induce an electromagnetic field in the rotor portion to selectively control an output torque of an output shaft, and the output shaft of the rotor being coupled to one of the first, intermediate or second ring structure. 20. A method of transferring torque between first and second independently rotating shafts of a gas turbine engine, the method comprising the steps of: providing an adjustable magnetic gearbox having a first ring structure, a second ring structure and an intermediate ring structure, each of the first, second and intermediate ring structure having an annular aperture therethrough and a plurality of magnetic pole pieces embedded therein, the intermediate ring structure disposed between the first ring structure and the second ring structure, each of the first, second and intermediate ring structure being coaxially disposed, concentric with, and independently rotatable with respect to the remaining ring structures; coupling the first shaft of the magnetic gearbox to the first ring structure; coupling the second shaft of the magnetic gearbox to the second ring structure; coupling a rotating machine to the intermediate ring structure, concurrently rotating at least two of the first and second shafts and the rotating machine; and controlling the ratio of torque transferred between the first and second ring structures by operating the rotating machine to supply or extract power from the intermediate ring structure. 21. A system for transferring torque between a plurality of independently, concurrently rotating shafts of an engine, the system comprising: a magnetic gearbox, the magnetic gearbox including a first ring structure, a second ring structure and an intermediate ring structure, each of the first, second and intermediate ring structure having an annular aperture therethrough and a plurality of magnetic pole pieces embedded therein, the intermediate ring structure disposed between the first ring structure and the second ring structure, each of the first, second and intermediate ring structure being coaxially disposed, concentric with, and independently rotatable with respect to the remaining ring structures; the first and second ring structures each being coupled to at least one of the plurality of rotating engine shafts, and the intermediate ring operable to transfer torque between the coupled shafts. 22. The system of claim 21, wherein the plurality of rotating shafts includes three shafts, each of the first ring, second ring and intermediate ring being connected to a separate shaft and the magnetic gearbox is operable to transfer torque between all three of the shafts. 23. The system of claim 22, wherein the system includes a pair of magnetic gearboxes configured to connect any one of the shafts to the remaining two shafts.
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