Cable forerunner

• US 6,279,850 B1
• Filed: 06/08/1999
• Issued: 08/28/2001
• Est. Priority Date: 11/04/1996
• Status: Expired due to Fees

• Current Assignee: ABB AB (ABB Limited)
• Original Assignee: ABB AB (ABB Limited)
• Inventors: Berggren, Soren
• Primary Examiner(s): Enad, Elvin
• Application Number:
  US09/297,608
• Time in Patent Office: 812 Days
• Field of Search: 310/42, 242/432, 242/432.1, 242/432.6, 242/433.4, 242/434, 242/264.4, 140/48, 226/92
• US Class Current: 242/432
• CPC Class Codes: H02K 15/085 by laying conductors into slotted stators
• CPC Class Codes: H02K 2203/15 Machines characterised by cable windings, e.g. high-voltage cables, ribbon cables

Abstract

A cable forerunner for winding a high-voltage cable in an electric machine, wherein one end of the cable forerunner (11) is attached to the end (10) of the cable (1), the cable forerunner (11) is arranged to draw the cable (1) through a first slot (15) arranged in the machine body (8) and also to control the curvature of the cable (1) at its exit from the slot (15) unitl its entry into a second slot (16) arranged in the machine body (8), as well as a procedure and also an electric machine having at least one winding comprising a high-voltage cable wound in accordance with the procedure for winding a high-voltage cable (1) in an electric machine, wherein one end of the cable forerunner (11) is attached to the end of the cable (1), whereafter the cable forerunner (11) is caused to draw the cable (1) through a first slot (15) arranged in the machine body (8) and to control the curvature of the cable (1) at its exit from the slot until its entry into a second slot (16) arranged in the machine body (8).

Claims

1. A procedure for winding a high-voltage cable in an electric machine, comprising the steps of attaching one end of a cable forerunner to the end of the cable;

drawing the cable forerunner and the attached cable through a first slot in the machine body; and

controlling the forerunner to a predefined radius of curvature so that the cable has a predefined curvature between its exit from the slot until its entry into a second slot in the machine body.

2. A procedure as claimed in claim 1, wherein controlling the radius of curvature of the cable comprises controlling the cable forerunner outside the machine body to establish a minimum radius or curvature of the forerunner.

3. A procedure as claimed in claim 2, wherein the forerunner is formed of interconnected articuable links having a selectable distance therebetween:

and establishing the minimum radius of curvature of the cable forerunner comprises adjusting the selectable distance between the links.

4. A procedure as claimed in claim 3, wherein the interconnected links are rotatable relative to the joints:

and establishing the minimum radius of curvature of the cable forerunner comprises rotating the links relative to the joints.

5. A procedure as claimed in claim 1, wherein the cable forerunner has a traction member, and drawing the forerunner comprises pulling the forerunner through the slots by the traction member.

6. A cable forerunner for winding a high-voltage cable between first and second slots in the body of an electric machine, wherein one end of the cable forerunner is attachable to the end of the cable for drawing the cable through the first slot, said forerunner having a minimum. radius of curvature to control the curvature of the cable at its exit from the slot until its entry into the second slot.

7. A cable forerunner as claimed in claim 6, comprising a number of rigid links and articuable joints connecting the joints.

8. A cable forerunner as claimed in claim 7, wherein each link has at least at one end and includes an axially displaceable spacer connected to the joint.

9. A cable forerunner as claimed in claim 8, further including a screw joint for connecting the spacer to the link.

10. A cable forerunner as claimed in claim 9, wherein each link has opposite axially displaced ends and includes a corresponding axially displaceable spacer at each end, and a screw joint for connecting each spacer to the corresponding link one screw joint of the link having a left-hand thread and the other screw joint of the link having a right-hand thread.

11. A cable forerunner as claimed in claim 10, further including a locking element for preventing rot between each joint.

12. A cable forerunner as claimed in claim 11, wherein the locking element is detachably inserted between each link for establishing a selected gap between the link and joint.

13. A cable forerunner as claimed in claim 12, wherein the cable forerunner is arranged to cooperate with guide members to facilitate curving the cable to the selected radius of curvature.

14. A cable forerunner as claimed in claim 13, wherein the guide members are motor-driven for drawing the cable from the first slot to the second slot.

15. A cable forerunner as claimed in claim 6, including first guide members arranged at the exit from the first slot;

and second guide members arranged at the entry into the second slot; and

one of the guide members is arranged to be driven with a speed deviating from the speed of the other guide member.

16. A cable forerunner attachable to the end of a cable for winding a high voltage machine and forming end windings between machine slots comprising:

a plurality of interconnected links selectively articuable to a minimum radius of curvature R.

17. A cable forerunner as claimed in claim 16, wherein the links include a traction link at a distal end;

a cable connector link at a proximal end attachable to the end of the cable; and

a plurality of intermediate links interconnected between the traction link and connection link, adjacent ones of said links having a spacing for establishing a minimum bending radius R of the forerunner.

18. A cable forerunner as claimed in claim 16, wherein the adjacent links include confronting spaced apart end portions said spacers for establishing the minimum radius of curvature.

19. A cable forerunner as claimed in claim 18 wherein the each confronting end portions include a joint articuable in at least one plane.

20. A cable forerunner as claimed in claim 16, wherein the links comprise cylindrical members.

21. A cable forerunner as claimed in claim 16 wherein adjacent links have confronting circular open end portions, and a joint having a free connector end and a threadable end sleeved in the open end of the cylindrical member for establishing a selected distance between the free end and the circular end.

22. A cable forerunner as claimed in claim 21, wherein the cylindrical members have an adjustable overall length l between free ends, a radius r, and a distance A between the free end and the circular end such that 1/2R=r/Δ

.

23. A cable forerunner as claimed in claim 21, wherein the confronting ends of the cylindrical members have threads in opposite senses.

24. A cable forerunner as claimed in claim 16, wherein the l/2R=Δ

/r when I is the length of each link;

Δ

is a space between links; and

r is a radius of each link.

25. A cable forerunner attachable to the end of a cable for winding a high voltage machine and forming end windings between machine slots comprising:

a plurality of interconnected links selectively articuable to a selected radius of curvature R.