Dynamoelectric machine rotor endwindings with cooling passages

• US 5,252,880 A
• Filed: 11/24/1992
• Issued: 10/12/1993
• Est. Priority Date: 11/24/1992
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Abate, Victor R., Kazmierczak, Edmund E.
• Primary Examiner(s): Voeltz, Emanuel T.
• Assistant Examiner(s): LABALLE, CLAYTON E
• Application Number:
  US07/980,732
• Time in Patent Office: 322 Days
• Field of Search: 310/52, 310/54, 310/55, 310/57, 310/58, 310/59, 310/60 R, 310/60 A, 310/61, 310/64, 310/65, 310/201, 310/206, 310/207
• US Class Current: 310/270
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors

Abstract

The dynamoelectric machine has endwindings including a plurality of superposed conductor bars 22 and adjacent end turns 20. Rabbets 32 are formed along the undersides of the adjoining conductor bars and end turns to receive portions 34 of gussets 30, remaining portions 35 of the gussets projecting to one side of the joint. The conductor bars and end turns have grooves 38, 36 forming cooling passages with ports 42, 40 opening to one side of the joint short of the joint. The gusset 30 has a barrier 44 spaced from the joint and forms with the ports a cooling channel 46 between the ports for transporting cooling gas between the cooling gas channels of the conductor bars and end turns.

Claims

1. In a dynamoelectric machine having endwindings including at least one conductor bar and at least one end turn having ends forming a junction, a joint including said junction of said conductor bar and said end turn for facilitating passage of cooling gas therebetween, comprising:

a gusset secured to the ends of said conductor bar and said end turn for strengthening said joint;

said one conductor bar and said one end turn each having a passage for passing cooling gas therealong and a port for passing cooling gas therethrough, said port in said conductor bar opening through a side thereof and said port in said end turn opening through a side thereof, said ports being located short of said junction and opening toward one side of said joint;

said gusset having a portion extending to said one side of said joint beyond said conductor bar and said end turn and a barrier spaced from said junction and projecting from said gusset portion on said one side of said joint to define at least a portion of a cooling gas channel extending between said ports and along said gusset portion and said barrier whereby cooling gas may pass through said passages, said ports and said channel.

2. A joint according to claim 1 wherein said barrier extends and engages between said conductor bar and said end turn on said one side of said joint.

3. A joint according to claim 1 wherein the ends of said conductor bar and said end turn have adjoining rabbets formed therein, said gusset being received in said rabbets, said conductor bar and said end turn extending substantially at right angles relative to one another with the ends thereof forming a miter joint, surfaces of said one bar and said end turn on said one joint side and in spaced opposition to said barrier defining at least another portion of said cooling gas channel.

4. A joint according to claim 3 wherein said gusset includes opposite side edges in said rabbets, respectively, extending generally parallel to said mitered joint, said gusset having end edges generally parallel to side edges of said bar and said end turn, respectively, on the side of said joint opposite said one side.

5. A joint according to claim 1 wherein said conductor bar and said end turn form an included angle therebetween on said one side of said joint.

6. A joint according to claim 1 wherein said barrier extends and engages between said conductor bar and said end turn on said one side of said joint, the ends of said conductor bar and said end turn having adjoining rabbets formed therein, said gusset being received in said rabbets, said conductor bar and said end turn extending substantially at right angles relative to one another forming an included angle on said one joint side, the ends of said conductor bar and said end turn forming a miter joint, surfaces of said one conductor bar and said end turn on said one side of said joint and in spaced opposition to said barrier defining at least another portion of said cooling gas channel, said gusset including opposite side edges in said rabbets, respectively, extending generally parallel to said mitered joint, said gusset having end edges generally parallel to side edges of said conductor bar and said end turn, respectively, on the side of said joint opposite said one side.

7. A joint according to claim 1 including a barrier block disposed on the side of said barrier remote from said cooling gas channel and bearing against said barrier.

8. A joint according to claim 7 including flexible non-conducting ties coupling said barrier block to said conductor bar and said end turn.

9. In a dynamoelectric machine having endwindings including at least one conductor bar and at least one end turn lying substantially in a common plane and having ends forming a junction in said plane, a joint including said junction of said conductor bar and said end turn for facilitating passage of cooling gas therebetween, comprising:

a gusset secured to the ends of said conductor bar and said end turn for strengthening said joint;

each said conductor bar and said one end turn having a passage for transmitting cooling gas therealong and a port for passing cooling gas therethrough, said port in said conductor bar opening through a side thereof and said port in said end turn opening through a side thereof, said ports being located short of said junction and on one side of said joint;

said gusset having a portion extending substantially in said plane and to said one side of said joint and having a thickness in a direction normal to said plane less than the thickness of said conductor bar and said end turn in said normal direction;

said gusset having a barrier of greater thickness in said normal direction than the thickness of said gusset portion and spaced from said junction to define with said gusset portion at least a portion of a cooling gas channel extending between said ports and along said gusset portion on said one side of said joint whereby cooling gas may pass through said passages, said ports and said channel.

10. A joint according to claim 9 wherein said barrier extends between said conductor bar and said end turn on said one side of said joint and has a thickness in said normal direction substantially equal to the thickness of said one conductor bar and said end turn.

11. A joint according to claim 9 wherein the ends of said conductor bar and said end turn have adjoining rabbets formed therein, said gusset being received in said rabbets, said conductor bar and said end turn extending substantially at right angles relative to one another with the ends thereof forming a miter joint therebetween, surfaces of said one conductor bar and said end turn on said one joint side and in spaced opposition to said barrier defining at least another portion of said cooling gas channel.

12. A joint according to claim 11 wherein said gusset includes opposite side edges in said rabbets, respectively, extending generally parallel to said miter joint, said gusset having end edges generally parallel to side edges of said conductor bar and said end turn, respectively, on the side of said joint opposite said one side.

13. A dynamoelectric machine comprising:

endwindings including a plurality of superposed conductor bars and a plurality of superposed adjacent end turns with each conductor bar in registry with an adjacent end turn and with ends thereof forming a junction;

a plurality of gussets, each gusset being secured to the ends of said conductor bar and said end turn for strengthening the junction therebetween and defining therewith a winding set, superposed winding sets of the conductor bars, end turns and gussets forming a joint assembly;

one of said winding sets having a first conductor bar and a first end turn each having a passage for transmitting cooling gas therealong, a port in said first bar in communication with the passage thereof for passing cooling gas therethrough, a port in said first end turn in communication with the passage thereof for passing cooling gas therethrough, said ports being located in said first conductor bar and said first end turn, respectively, adjacent said junction and on one side of said joint;

said one winding set having a first gusset of said plurality of gussets including a gusset portion projecting to said one side of said joint and beyond said first conductor bar and said first end turn;

said first gusset having a barrier spaced from said junction and projecting from said first gusset portion toward the gusset of a next adjacent winding set, said barrier defining with said gusset portion of said first gusset and a portion of the gusset of said next adjacent winding set, at least a portion of a cooling gas channel extending between said ports and along said first and next adjacent gusset portions on said one side of said joint whereby cooling gas may pass through said passages, said ports and said channel.

14. A joint according to claim 13 wherein said barrier extends and engages between said first conductor bar and said first end turn on said one side of said joint.

15. A joint according to claim 13 wherein the ends of said conductor bars and said end turns have adjoining rabbets formed therein, said gussets being received in said rabbets, said conductor bars and said end turns extending substantially at right angles relative to one another with the ends thereof forming miter joints, surfaces of said first conductor bar and said first end turn on said one joint side and in spaced opposition to said barrier defining at least another portion of said cooling gas channel.

16. A joint according to claim 15 wherein said each of said gussets includes opposite side edges in said rabbets, respectively, extending generally parallel to said mitered joint, said gussets having end edges generally parallel to side edges of said conductor bars and said end turns, respectively, on the side of said joint opposite said one side.

17. A joint according to claim 13 wherein said conductor bars and said end turns form an included angle therebetween on said one side of said joint.

18. A dynamoelectric machine comprising:

endwindings including a plurality of superposed conductor bars and a plurality of superposed adjacent end turns with each conductor bar in registry with an adjacent end turn and with ends thereof forming a junction;

a plurality of gussets, each gusset being secured to the ends of said conductor bar and said end turn for strengthening the junction therebetween and defining therewith a winding set, superposed winding sets of the conductor bars, end turns and gussets forming a joint assembly;

each of a plurality of said winding sets having a first conductor bar and a first end turn each having a passage for transmitting cooling gas therealong, a port in said first bar in communication with the passage thereof for passing cooling gas therethrough, a port in said first end turn in communication with the passage thereof for passing cooling gas therethrough, said ports being located in said first conductor bar and said first end turn, respectively, adjacent said junction and on one side of said joint;

each winding set of said plurality of winding sets having a first gusset of said plurality of gussets including a gusset portion projecting to said one side of said joint and having an edge beyond said first conductor bar and said first end turn;

a barrier block engaged along said edges of said gusset portions to define with said gusset portions of said first gussets and portions of the gussets of said next adjacent winding sets, at least portions of cooling gas channels extending between said ports and along said first and next adjacent gusset portions on said one side of said joint whereby cooling gas may pass through said passages, said ports and said channel.

19. A dynamoelectric machine according to claim 18 including flexible non-conducting ties coupling said barrier block to said conductor bars and said end turns in substantial sealing relation therewith and with said gusset edges.

20. A dynamoelectric machine according to claim 18 including at least one sealing cap extending between said barrier and a conductor bar and end turn.