Dynamo electric machines
View Patent ↗A dynamo electric machine for an aircraft gas turbine engine includes a housing supporting a stator of the dynamo electric machine, a rotor assembly rotatably mounted in the housing and including an elongate hollow rotor shaft, a main shaft for connection at one end to the associated gas turbine engine assembly, said main shaft extending coaxially within said hollow rotor shaft, and a sleeve-like member of electrically insulating material between said rotor shaft and said main shaft, said sleeve-like member providing an electrically insulating driving connection between said main shaft and said rotor shaft whereby said main shaft and said rotor shaft rotate together.
1. A dynamo electric machine for an aircraft gas turbine engine including a housing supporting a stator of the dynamo electric machine, a rotor assembly rotatably mounted in the housing and including an elongate hollow rotor shaft, a main shaft for connection at one end to the associated gas turbine engine assembly, said main shaft extending coaxially within said hollow rotor shaft, and, a sleeve-like member of electrically insulating material between said rotor shaft and said main shaft, said sleeve-like member providing an electrically insulating driving connection between said main shaft and said rotor shaft whereby said main shaft and said rotor shaft rotate together,
wherein a large diameter washer of an electrically insulating material is carried adjacent one end of the main shaft.
2. A machine according to claim 1 , wherein the sleeve-like member has an outer surface of non-circular cross-sectional shape, the inner surface of the adjacent part of the rotor shaft being of substantially the same non-circular shape.
3. A machine according to claim 2 , wherein the said non-circular cross-sectional shape is a square section.
4. A machine according to claim 3 , wherein the corners of the square cross-section are rounded.
5. A machine according to claim 1 , wherein the sleeve-like member has an inner surface of non-circular cross-sectional shape, the outer surface of the adjacent part of the main shaft being of substantially the same non-circular shape.
6. A machine according to claim 5 , wherein the said non-circular cross-sectional shape is a square section.
7. A machine according to claim 6 , wherein the corners of said square cross-section are rounded.
8. A machine according to claim 1 , further comprising a spring loaded dampener assembly.
9. A machine according to claim 8 , wherein ceramic layers are interposed between components of the spring loaded dampener assembly and the rotor and main shafts.
10. A dynamo electric machine for an aircraft gas turbine engine including a housing supporting a stator of the dynamo electric machine, a rotor assembly rotatably mounted in the housing and including an elongate hollow rotor shaft, a main shaft for connection at one end to the associated gas turbine engine assembly, said main shaft extending coaxially within said hollow rotor shaft, and, a sleeve-like member of electrically insulating material between said rotor shaft and said main shaft, said sleeve-like member providing an electrically insulating driving connection between said main shaft and said rotor shaft whereby said main shaft and said rotor shaft rotate together,
wherein the sleeve-like member has an outer surface of non-circular cross-sectional shape, the inner surface of the adjacent part of the rotor shaft being of substantially the same non-circular shape, and
wherein a large diameter washer of an electrically insulating material is carried adjacent one end of the main shaft.
11. A machine according to claim 10 , wherein the said non-circular cross-sectional shape is a square section.
12. A machine according to claim 11 , wherein the corners of the square cross-section are rounded.
13. A machine according to claim 10 , wherein the sleeve-like member has an inner surface of non-circular cross-sectional shape, the outer surface of the adjacent part of the main shaft being of substantially the same non-circular shape.
14. A machine according to claim 13 , wherein the said non-circular cross-sectional shape is a square section.
15. A machine according to claim 14 , wherein the corners of said square cross-section are rounded.
16. A machine according to claim 10 , further comprising a spring loaded dampener assembly.
17. A machine according to claim 16 , wherein ceramic layers are interposed between components of the spring loaded dampener assembly and the rotor and main shafts.