Rotor for rotary electrical device

Abstract

A rotor for a rotary electrical device to be arranged to face to a stator, comprises a rotor iron core extending axially and including a plurality of slots arranged with a predetermined circumferential interval, a rotor coil contained by the slots, a coil support member of electrically insulating property arranged between parts of the rotor coil at an axial end of the rotor coil, and a retaining ring covering the coil support member and the axial end of the rotor coil, the coil support member has two fitted portions and a connecting portion connecting the fitted portions to each other to form H-shape of cross section and to form a space between the rotor coil and each of opposite sides of the connecting portion, and the coil support member further has a communicating path communicating to the spaces.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is an oblique projection view showing an axial end of a rotor coil in a turbine-driven generator as a first embodiment of a rotor for a rotary electrical device of the invention.

FIG. 2 is a cross sectional view of FIG. 1.

FIG. 3 is a diagram showing a relationship between a longitudinal position of the electrically conductive member and a temperature of the rotor coil in each of the embodiment 1 of the invention and the prior art.

FIG. 4 is an oblique projection view showing a coil support member in an embodiment 2 of the invention.

FIG. 5 is an oblique projection view showing the axial end of the rotor coil in an embodiment 3 of the invention.

FIG. 6 is an oblique projection view showing a coil support member in an embodiment 4 of the invention.

FIG. 7 is a cross sectional view showing the axial end of the rotor coil in an embodiment 5 of the invention.

FIG. 8 is an oblique projection view showing the axial end of the rotor coil in an embodiment 6 of the invention.

FIG. 9 is a partially cross sectional view of a turbine-driven generator as an example of the invention.

FIG. 10 is an oblique projection view showing the axial end of the rotor coil of the invention.

Claims

1. A rotor for a rotary electrical device to be arranged to face to a stator, comprising a rotor iron core extending axially and including a plurality of slots arranged with a predetermined circumferential interval, a rotor coil contained by the slots, a coil support member of electrically insulating property arranged between parts of the rotor coil at an axial end of the rotor coil, and a retaining ring covering the coil support member and the axial end of the rotor coil, wherein the coil support member has two fitted parts and a connecting part connecting the fitted parts to each other to form H-shape of cross section and to form a space between the rotor coil and each of opposite sides of the connecting part, and the coil support member further has a communicating path communicating with the spaces.

2. The rotor according to claim 1, wherein the communicating path communicating with the spaces between the opposite sides of the connecting part and the rotor coil adjacent to each other is formed by making a radially outer end of the connecting part shorter than radially outer ends of the fitted parts.

3. The rotor according to claim 1, wherein a radially inner side of at least one of the fitted parts of the coil support member is made shorter than a radially inner side of the connecting part to expose a radially inner portion of the connecting part at a radially inner side of the rotor coil.

4. The rotor according to claim 1, wherein radially inner sides of both of the fitted parts of the coil support member are made shorter in a radial direction than a radially inner side of the connecting part to expose only a radially inner portion of the connection part at a radially inner side of the rotor coil.

5. The rotor according to claim 1, wherein the communicating path communicating with the spaces between the opposite sides of the connecting part and the rotor coil adjacent to each other is formed by a through hole in the connecting part.

6. The rotor according to claim 5, wherein an outer peripheral surface of the connecting part is the same radial position as both of the fitted parts, and the through hole is arranged at a radially inner side from a radially outermost position on the connecting part.

7. The rotor according to claim 1, wherein the connecting part of the coil support member has a trapezoidal shape whose circumferential width in longitudinal cross section thereof increases radially outward to make the spaces parallel to side surfaces of the coil and an area of wind flow path constant.

8. The rotor according to claim 1, wherein the connecting part of the coil support member is made of a material higher in thermal conductivity than that of the fitted parts.

9. A rotor for a rotary electrical device, comprising a rotor core, a coil arranged on the rotor core, and a coil support member arranged between parts of the coil adjacent to each other on the rotor core, wherein the coil support member has two pairs of first surfaces, the first surfaces of each of the two pairs face closely to corresponding one of the parts of the coil to prevent the parts of the coil from contacting each other and are juxtaposed with each other in a longitudinal direction of the coil, and the coil support member further has a pair of second surfaces facing to respective ones of the parts of the coil, arranged between the first surfaces of respective ones of the two pairs in the longitudinal direction of the coil and dented with respect to the first surfaces of the respective ones of the two pairs to form respective spaces between the second surfaces and the parts of the coil.

10. The rotor according to claim 9, wherein the coil support member further has at least one of notch and hole arranged between the first surfaces of each of the two pairs to fluidly communicate to both of the spaces.

11. The rotor according to claim 10, wherein a part of each of the second surface terminates at a radially inner side with respect to radially outermost ends of the first surfaces of the two pairs to form the at least one of notch and hole.

12. The rotor according to claim 9, wherein a part of each of the second surface terminates at a radially inner side with respect to radially innermost ends of one of the first surfaces of one of the two pairs and one of the first surfaces of the other one of the two pairs facing to the respective ones of the parts of the coil.

13. The rotor according to claim 9, wherein a part of each of the second surface terminates at a radially inner side with respect to radially innermost ends of the first surfaces of the two pairs.

14. The rotor according to claim 9, wherein a thermal conductivity of a material forming the second surfaces is higher than a thermal conductivity of a material forming the first surfaces.

15. The rotor according to claim 9, wherein a material forming the first surfaces is electrically insulative.

16. The rotor according to claim 9, wherein a material forming the second surfaces is electrically conductive.

17. The rotor according to claim 9, wherein a thickness between the second surfaces increases radially outward between the parts of the coil whose distance increases radially outward.

18. The rotor according to claim 9, wherein the coil support member extends to a radially inner side with respect to the parts of the coil.

19. The rotor according to claim 18, wherein the second surfaces extends to a radially inner side with respect to the parts of the coil.

20. The rotor according to claim 18, wherein the second surfaces extends to a radially inner side with respect to one of the first surfaces of each of the two pairs as an upstream side in a cooling wind direction.