Strip of lamination sectors and a method of manufacturing a magnetic circuit for an electrical machine

• US 20010015006A1
• Filed: 01/23/2001
• Published: 08/23/2001
• Est. Priority Date: 01/28/2000
• Status: Active Grant

• Current Assignee: Moteurs Leroy Somer (Emerson Electric Company)
• Original Assignee: Moteurs Leroy Somer (Emerson Electric Company)
• Inventors: Vohlgemuth, Patrick
• Granted Patent: US 6,741,005 B2
• Time in Patent Office: Days
• US Class Current: 29/596
• CPC Class Codes: H02K 1/16 Stator cores with slots for windings
• CPC Class Codes: H02K 1/185 to outer stators
• CPC Class Codes: H02K 15/024 with slots
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine

Abstract

The invention relates to a strip of lamination sectors for making a magnetic circuit of an electrical machine, the sectors are interconnected by links, and the strip is for winding on a mandrel to form a stack of layers of sectors. Said links lie outside the sectors.

Claims

1. A strip of lamination sectors for making a magnetic circuit of an electrical machine, the sectors being interconnected by links, said strip being designed to be wound on a mandrel to form a stack of layers of sectors, wherein said links are external to the sectors.

2. A strip according to

claim 1

, wherein the links are constituted by deformable bridges of material obtained by being cut out together with the sectors.

3. A strip according to

claim 2

, wherein each of the bridges of material has a portion presenting two parallel edges.

4. A strip according to

claim 2

, wherein each of the bridges of material has two narrowings on either side of a middle portion.

5. A strip according to

claim 2

, wherein each of the bridges of material has two concentric edges.

6. A strip according to

claim 2

, wherein each bridge of material has an edge situated in line with the lateral edge of a sector to which it is connected.

7. A strip according to

claim 1

, wherein the sectors are interconnected by staples.

8. A strip according to

claim 1

, wherein each sector has at least one slot for passing electrical conductors.

9. A strip according to

claim 1

, wherein the sectors have complementary profiles on their docking flanks.

10. A strip according to

claim 9

, wherein one of the docking flanks has a tooth and the other has a notch.

11. A method of manufacturing a magnetic circuit for an electrical machine, the method comprising the steps consisting in:

making a strip of lamination sectors interconnected by deformable and/or hinged links, two consecutive sectors within said strip presenting adjacent lateral edges forming an angle between each other; and

winding the strip of sectors on a mandrel so as to move said edges towards each other and thus make up a stack of layers of sectors, each sector being cut out in such a manner that its angular extent is different from an integer submultiple of a complete turn.

12. A method according to

claim 11

, wherein the strip is wound on a mandrel whose outside diameter is greater than or equal to 300 mm.

13. A method according to

claim 11

, wherein said mandrel is rotated.

14. A method according to

claim 11

, wherein the angular width of a sector is equal to 360°

. (1/k±

j/n_d), where n_d is the total number of slots per complete turn, k is a non-zero integer that is an integer submultiple of n_d, and j is a non-zero integer.

15. A method according to

claim 14

, wherein n_d is selected from the following values:

48;

60;

72;

84;

96, j lies in the range 1 to 3, and k is greater than or equal to 3, and is preferably equal to 6.

16. A method according to

claim 11

, wherein the links between the sectors are used as guides for fixing bars on the stack of laminations.

17. A magnetic circuit for an electrical machine, the circuit comprising a stack of layers of sectors formed by helically winding a strip of sectors that are interconnected by deformable and/or hinged links situated peripherally, outside the stacked sectors.

18. A circuit according to

claim 17

, wherein each sector presents an angular width that is not an integer submultiple of a complete turn.

19. A circuit according to

claim 18

, wherein the angular width of a sector is equal to 360°

. (1/k±

j/n_d), where n_d is the total number of slots per complete turn, k is an integer submultiple of n_d, and j is an integer.

20. A circuit according to

claim 19

, wherein n_d is selected from the following values:

48;

60;

72;

84;

96, j lies in the range 1 to 3, and k is greater than or equal to 3, and preferably equal to 6.

21. A circuit according to

claim 17

, wherein the inside diameter of the stack is greater than or equal to 300 mm.

22. A circuit according to

claim 17

, wherein the deformable links are constituted by bridges of material cut out together with the sectors.

23. A circuit according to

claim 17

, wherein the deformable links comprise staples.

24. A circuit according to

claim 17

, wherein bars are fixed on the periphery of the stack, being engaged on or between the links interconnecting the sectors.

25. An electrical machine, including a magnetic circuit as defined in

claim 17

.

26. A machine according to

claim 25

, wherein said bars co-operate with a case of the machine to constitute cooling channels.