Electric rotary machine

• US 6,288,461 B1
• Filed: 10/29/1999
• Issued: 09/11/2001
• Est. Priority Date: 10/30/1998
• Status: Expired due to Term

• Current Assignee: mitsubishi hitachi power systems, ltd. (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: Hitachi, Ltd.
• Inventors: Kimoto, Hiroshi, Miyakawa, Kado, Shibata, Takashi, Yokoyama, Shingo, Mori, Hideaki, Sonobe, Tadashi
• Primary Examiner(s): Waks, Joseph
• Application Number:
  US09/429,953
• Time in Patent Office: 683 Days
• Field of Search: 310/58, 310/60.A, 310/61, 310/201, 310/261
• US Class Current: 310/58
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors

Abstract

In order to provide an electric rotary machine in which the cooling performance can be improved without providing specific means on the flow path of cooling gas and without increasing the flow rate of the cooling gas, a plurality of through holes 21 perforated in each of plate-shaped conductors 16 forming a winding conductor 15 are arranged in plural rows of through holes 21a, 21b in the width direction of the plate-shaped conductor, a plurality of cooling gas flow paths 20 formed in the winding conductor 15 branch off into plural rows and the cooling area for the cooling gas is increased.

Claims

1. An electric rotary machine comprising a rotor winding having a plurality of winding conductors accommodated in a plurality of slots formed in a rotor core and formed of a plurality of plate-shaped conductors laminated and insulated from one another, each said winding conductor having a plurality of through holes perforated therein to provide a plurality of flow paths for allowing a cooling gas introduced from a periphery of said rotor core to flow in an axial direction of said rotor core while simultaneously allowing the cooling gas to flow also in a radial direction of said rotor core, wherein said plurality of through holes are disposed in a plurality of rows arranged in a width direction of said conductors, said plurality of flow paths being of a plurality of entry side flow paths composed of at least two rows of said plurality of rows and a plurality of exhaust side flow paths composed of at least two other rows of said plurality of rows.

2. An electric rotary machine according to claim 1, wherein said plurality of through holes perforated or flow paths formed in at least a conductor at a second step to a bottom step of said conductors and in a conductor at the top step of said conductors, are formed in one row on each of cooling gas entry and exhaust sides in the width direction of said conductors.

3. An electric rotary machine according to claim 1, wherein the number of rows, arranged in the width direction of a conductor, of through holes perforated or flow paths formed in a conductor, or conductors on a lower step side of said plurality of conductors, is smaller than the number of rows, arranged in the width direction of said conductor, of through holes perforated or flow paths formed in a conductor or conductors on an upper step side.

4. An electric rotary machine according to claim 1, wherein a flow path area of each of said plurality of through holes or flow paths formed in a plurality of rows is set so that the following relation is established

5. An electric rotary machine according to claim 1, wherein a width size, in the width direction of said conductor, of a portion between the rows of a through holes or flow paths formed in a plurality of rows is set so that the following relation is established

6. An electric rotary machine according to claim 1, wherein a majority of said conductors have two rows of said plurality of rows forming said entry side flow paths and another two rows of said plurality of rows forming said exhaust side flow paths, each of said plurality of rows being one of said plurality of through holes.

7. An electric rotary machine according to claim 6, wherein at least one of an uppermost conductor and a lowermost conductor of said conductors having less than said two rows forming said entry side flow paths and said two rows forming said exhaust side flow paths.

8. An electric rotary machine comprising a rotor winding having a plurality of winding conductors accommodated in a plurality of slots formed in a rotor core and formed of a plurality of plate-shaped conductors laminated and insulated from one another, said winding conductors having a plurality of flow paths for allowing a cooling gas from a periphery of said rotor core to flow in an axial direction of said rotor core while simultaneously allowing the cooling gas to flow also in a radial direction of said rotor core, wherein said plurality of flow paths each branch off into a plurality of rows arranged in a width direction of said conductors, said plurality of flow paths being of a plurality of entry side flow paths composed of at least two rows of said plurality of rows and a plurality of exhaust side flow paths composed of at least two other rows of said plurality of rows.

9. An electric rotary machine comprising a rotor winding having a plurality of winding conductors accommodated in a plurality of slots formed in a rotor core and formed of a plurality of plate-shaped conductors laminated and insulated from one another, each said winding conductor having a plurality of through holes perforated therein to provide a plurality of V-shaped flow paths, wherein said plurality of through holes are disposed in a plurality of rows arranged in a width direction of said conductors, said plurality of flow paths being of a plurality of entry side flow paths composed of at least two rows of said plurality of rows and a plurality of exhaust side flow paths composed of at least two other rows of said plurality of rows.

10. An electric rotary machine comprising a rotor winding having a plurality of winding conductors accommodated in a plurality of slots formed in a rotor core and formed of a plurality of plate-shaped conductors laminated and insulated from one another, said winding conductors each having a plurality of V-shaped flow paths, wherein said plurality of V-shaped flow paths are disposed in a plurality of rows each arranged in a width direction of said conductors, said plurality of flow paths being of a plurality of entry side flow paths composed of at least two rows of said plurality of rows and a plurality of exhaust side flow paths composed of at least two other rows of said plurality of rows.

11. An electric rotary machine comprising a rotor winding having a plurality winding conductors accommodated in a plurality of slots formed in a rotor core and formed of a plurality of plate-shaped conductors laminated and insulated from one another, each said winding conductor having a plurality of through holes perforated therein to provide a plurality of flow paths continuing in the radial direction of said rotor core while deviating in the axial direction of said rotor core, wherein said plurality of through holes are disposed in a plurality of rows arranged in a width direction of said conductors, said plurality of flow paths being of a plurality of entry side flow paths composed of at least two rows of said plurality of rows and a plurality of exhaust side flow paths composed of at least two other rows of said plurality of rows.

12. An electric rotary machine according to claim 11, wherein said plurality of through holes perforated or flow paths formed in at least one winding conductor at a second step to a bottom step of said winding conductors and in a winding conductor at a top step of said winding conductors are formed in one row in the width direction of said winding conductors at the second and top steps.

13. An electric rotary machine according to claim 11, wherein a flow path area of each of said plurality of through holes or flow paths formed in a plurality of rows is set so that the following relation is established

14. An electric rotary machine according to claim 11, wherein a size, in the width direction of a conductor, of a portion between the rows of said through holes or flow paths formed in a plurality of rows is set so that the following relation is established

15. An electric rotary machine comprising a rotor winding having a plurality of winding conductors accommodated in a plurality of slots formed in a rotor core and formed of a plurality of plate-shaped conductors laminated and insulated from one another, each said winding conductor having a plurality of flow paths formed therein continuing in the radial direction of said rotor core while deviating in the axial direction of said rotor core, wherein said plurality of flow paths each are V-shaped and branch off into a plurality of rows arranged in the width direction of said conductors, said plurality of flow paths being of a plurality of entry side flow paths composed of at least two rows of said plurality of rows and a plurality of exhaust side flow paths composed of at least two other rows of said plurality of rows.

16. An electric rotary machine comprising a rotor winding having a plurality of winding conductors accommodated in a plurality of slots formed in a rotor core and formed of a plurality of plate-shaped conductors laminated and insulated from one another, said plurality of conductors are made by at least one conductor arranged at a top of said slot, at least one conductor arranged on a bottom side of said slot and a plurality of conductors arranged intermediately between said top and said bottom side of said slot, each of said intermediately arranged conductors having a plurality of through holes perforated therein to provide a plurality of flow paths or allowing a cooling gas introduced from a periphery of said rotor core to flow in an axial direction of said rotor core while allowing the cooling gas to flow in a radial direction of said rotor care,

wherein said plurality of through holes are disposed in a plurality of rows arranged in a width direction of said conductors, said plurality of flow paths being of a plurality of entry side flow paths composed of at least two rows of said plurality of rows and a plurality of exhaust side flow paths composed of at least two other rows of said plurality of rows.

17. An electric rotary machine according to claim 16, wherein said at least one conductor at the top of said slot has a plurality of through holes arranged in two rows in a width direction of said at least one conductor at the top of said slot, at least one conductor on the bottom side of said slot being one conductor at a bottom of said slot and at least one conductor arranged on said one conductor at the bottom of said slot, and said at least one conductor arranged on said conductor at the bottom of said slot having a plurality of through holes arranged in two rows in a width direction of said at least one conductor arranged on said one conductor at the bottom of said slot.